JANUARY CENTS HARCOURT BRACE JOVANOVICH ......5V p -p 1 KHz calibration voltage. $450.00 B&K Model 1431 3" Triggered "Mini -Scope" As above, but 1/3 the size. $399.00 B&K Model 1403

JANUARY 1975.75 CENTS A HARCOURT BRACE JOVANOVICH PUBLICATION

ELECTRONIC TECHNICIAN/DEALER WORLD'S LARGEST TV-RADIO SERVICE & SALES CIRCULATION

Testing Bipolar Transistors In & Out Of Circuit Annual Subject Reference Index

Precision Tuner Service 1TTTü L. now available near you

ALABAMA: 524 32ND STREET SOUTH BIRMINGHAM, ALA. 35222 TEL. 205, 3232657

CALIFORNIA-NORTH: 4611 AUBURN BLVD. SACRAMENTO, CALIF. 95841 TEL. 916, 482.6220

CALIFORNIA-SOUTH: 5111 UNIVERSITY AVE. SAN DIEGO, CALIF. 92105 TEL. 714, 280-7070

COLORADO: 4958 ALLISON ST ARVADA, COLO. 80001 TEL. 303, 423-7080

FLORIDA-NORTH: 1918 BLANDING BLVD. JACKSONVILLE, FLA. 32210

TEL. 904, 389-9952

FLORIDA-SOUTH: 12934 N.W. 7th AVE. MIAMI, FLA. 33168

TEL. 305, 685-9811

HOME OFFICE-INDIANA: 5233 S HWY. 37 BLOOMINGTON, IND. 47401

TEL. 812, 824-9331

KANSAS: 3116 MERRIAM INE KANSAS CITY, KANSAS 66100 TEL. 913, 831-1222

TEXAS-EAST: 432426 TELEPHONE RD. HOUSTON, TEX. 77032 TEL. 713, 6446793

TEXAS-NORTH: MOPAC LANE LONGVIEW, TEX. 75601 TEL. 214, 7534334

TENNESSEE: 3614 LAMAR AVE. MEMPIIIS, TN. 38118 TEL, 901, 365.1918

PENNSYLVANIA-WEST: 257 RIVERVIEW AVE. W. PITTSBURGH, PA. 15202 TEL. 412, 761-7648

PENNSYLVANIA-EAST: 1921 S. 70th ST. PHILADELPHIA, PA. 19142 TEL. 215, 724.0999

OREGON:

5220 N.E. SANDY BLVD. PORTLAND, OREGON 97213 TEL. 503, 2829636

... new pts products ... stop ... new 1974- 1975 tuner replacement guide and parts catalog no. 4 ... stop ... 96 pages of top tuner information ... stop ...

. blow-ups of all types of vhf and uhf tuners for easy parts identification .. .

.. stop ... largest exact tuner replacement guide available in the industry . , , stop ... antenna coil replacement

guide ... stop ... multifit replacement tuner shaft guide ... stop ...

... available for $2.00... stop .. ... redeemable with min.

order ... stop ... pts elex .. .

OKLAHOMA: 3007 N. MAY OKLAHOMA CITY, OKLA. 73106

TEL. 405, 947-2013

OHIO-SOUTH: US TUNER SERVICE 8180 VINE ST.

CINCINNATI, OHIO 45215 TEL. 513, 821-2298

OHIO-NORTH: 5682 STATE RD.

CLEVELAND, OHIO 44134 TEL. 216, 845-4480

NORTH CAROLINA: 724 SIEGLE AVE. CHARLOTTE, N.C. 28205 TEL. 704, 332-8007

N.Y. CITY-NEW JERSEY: 158 MARKET ST. E PATERSON, N.J. 07407

TEL. 201, 791.6380

NEW YORK,

993 SYCAMORE ST. BUFFALO, N.Y. 14212 TEL. 716, 891-4935

LOUISIANA: 2914 WYTCHWOOD DR. METAIRIE, LOUISIANA 70033 TEL. 504, 885.2349

MARYLAND: 1105 SPRING ST. SILVER SPRING, MD. 20910 TEL. 301, 565-0025

MASSACHUSETTS: 191 CHESTNUT ST.

SPRINGFIELD, MASS. 01103 TEL. 413, 734.2737

MICHIGAN: 13709 WEST 8 MILE RD. DETROIT, MI. 48235 TEL. 313, 8621783

MINNESOTA: 815 WEST LAKE ST. MINNEAPOLIS, MINN. 55408 TEL. 612, 8242333

MISSOURI: 8456 PAGE BLVD.

ST LOUIS, MO. 63130 TEL. 314, 428-1299

LET US TAKE CARE OF YOUR TUNER PROBLEMS... PTS will repair any tuner-no matter how old or new-black & white or color-transistor or tubes --varactor or electronically tuned-detent UHF. 8 hour service is a must!

...THIS IS THE SERVICE WE OFFER: 1. Fastest Service -8 hour-in and out the same day. Overnight transit to one of our

strategically located plants. 2. Best Quality-Your customers are satisfied and you are not bothered with returning

tuners for rework. 3. PTS uses only ORIGINAL PARTS! No homemade or make -do, inferior merchandise (this

is why we charge for major parts!). You get your tuner back in ORIGINAL EQUIPMENT condition.

4. PTS is recommended by more TV Manufacturers than any other tuner company. 5. PTS is overhauling more tuners than all other tuner services combined.

Fast 8 hr. Service!

We offer you finer, faste ..,:,

p` s Precision, Tuner Service

1 YEAR GUARANTEE

ELECTRONICS, INC.... ...Number ONE and still trying harder!

(Not a Franchise Company)

VHF, UHF $10.95 UV-COMBO 17.95 IF -SUBCHASSIS 12.50

Major parts and shipping charged at cost.

(Dealer net!) Over 4000 exact tuner replacements available for $14.95 up

(new or rebuilt)

... for more details circle 123 on Reader Service Card

Now, 23v black matrix

in an economy line. From Sylvania, of course.

Replacing a black -matrix tube has usually meant buying a brand new tube because rebuilts just didn't exist. Now, Sylvania has changed all that.

We've added five black -matrix tube types to our low-cost Color Screen 85 line, and that even includes the popular 23 -inch diagonal size.

That means you can offer your customers two different price ranges.

And increase sales opportunities by offering a ow -price replacement.

With Sylvania, you not only have one of the broadest lines of replacement tubes in the industry.

You also have the latest.

Electronic Components Group, GTE Sylvania, 100 First Ave., Waltham, Mass. 02154.

SYLVANIA

JANUARY 1975, ELECTRONIC TECHNICIAN/DEALER 1

how 80% of $2,000 is only

$58000

dinibbe. in emir& gis

V ME

Oscilloscopes for most production, inspection, QC and lab applications are not used to their full capability. In fact their full capability in bandwidth may even need to be limited by an external band pass filter for easier trace readability. In one electronics manufacturing facility a survey of 22 applications discovered 19 applications which were appropriately served by our least expensive $179.95 oscilloscope with recurrent sweep and 2MHz bandwidth. A survey of your facility may reveal similar opportunities for saving. Our triggered sweep scopes with 10MHz bandwidth and 35 nanosecond rise time answer the needs of more than 80% of all applications. Sensitivity of 10mV/cm offered by both our single and dual trace triggered sweep scopes is similarly suitable for over 80% of all applications.

Why overspecify your oscilloscopes? It's not necessary if the intent is to be sure you get the repeatability, reliability, ruggedness and versatility that is characteristic of every B&K oscilloscope. Move your ultra -wide bandwidth scopes to other applications where you need them. You'll find the B&K scopes easier to use with their simplified, human -engineered panels and controls. 10 Day Free Trial With more than 20 years successful experience in manufacturing fine test equipment at competitive prices, Dynascan has the confidence in its new B&K instruments to offer them on a 10 day free trial basis. Just properly identify yourself, your company and your application and we'll supply a new oscilloscope that will prove our claim to quality and value. Write on your letterhead for complete specifications and Free Trial.

PRODUCTS OF

DrNAscAN

Model 1470

CONDENSED SPECIFICATIONS

B&K Model 1470 Dual Trace Triggered Sweep Scope DC to 10MHz at 10mV/cm. Two separate vertical amplifiers. 35 n sec rise time. Six dual pattern modes including chopped, alternate, add and Channel 2 inverted. Auto and triggered sweep 1 usec/cm to 0.1 sec/cm. 5X magnification. $580.00

B&K Model 1460 Triggered Sweep Scope DC to 10MHz at 10mV/cm. 35 n sec rise time. 0.5 usec/cm to 0.5 sec/cm auto and triggered sweep. 5X magnification. 5V p -p 1 KHz calibration voltage. $450.00 B&K Model 1431 3" Triggered "Mini -Scope" As above, but 1/3 the size. $399.00

B&K Model 1403 Portable 3" "Mini -Scope" 3" solid state scope only 51/4"x73/8"x111/4". DC to 2MHz bandwidth and 20mV/cm sensitivity. Recurrent sweep 10Hz to 100kHz. Weighs only 81/2 pounds. $189.00

1801 W. Belle Plaine Ave. Chicago, IL 60613 Phone (312) 327-7270 Complete Line of Analog and Digital Multimeters, Oscilloscopes, Signal Generators, Semiconductor Testers, Power Supplies, Probes, Tube Testers and Substitution Boxes. ... for more details circle 102 on Reader Service Card

2 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1975

J. W. PHIPPS Editor 1 East First Street Duluth, Minn. 55802 (218) 727-8511

ALFRED A. MENEGUS Publisher 757 Third Avenue New York, N.Y. 10017 (212) 754-4382

TOM GRENEY Publishing Director

JOSEPH ZAUHAR Managing Editor

S. J. SMITH Production Manager

JOHN PASZAK Graphic Design

LILLIE PEARSON Circulation Fulfillment

GENE BAILEY Manager, Reader Services

CONTRIBUTING EDITORS

JOSEPH J. CARR

BERNARD B. DAIEN

MANAGERS

DAVE HAGELIN 43 East Ohio Street Chicago, Ill. 60611 (312) 467-0670

CHUCK CUMMINGS Ad Space South/West 613 North O'Connor Irving, Texas 75060 (214) 253-8678

KEN JORDAN DONALD D. HOUSTON 1901 West 8th Street Los Angeles, Calif. 90057 (213) 483-8530

CHARLES S. HARRISON CY DOBSON 57 Post Street San Francisco, Calif.94104 (415) 392-6794

ROBERT UPTON Tokyo, Japan C.P.O., Box 1717

ELECTRONIC TECHNICIAN/DEALER JANUARY 1975 VOLUME 97 NUMBER 1

Cover photo courtesy of GTE Sylvania

FEATURES

12 TESTING BIPOLAR TRANSISTORS IN AND OUT OF CIRCUIT

Practical out -of -circuit resistance and in -circuit voltage tests of silicon and ger-

manium bipolars. By Bernard B. Daien, ET/D Contributing Editor.

22 PROFITABLE AND COMPETITIVE PRICING OF HOME SERVICE CALLS

A proven procedure for computing the flat rate you should charge for home calls.

By J. W. Phipps, ET/D Editor.

26 NEW IN COLOR TV FOR 1975-Part 5

New and significantly changed features and circuits in RCA's 1975 line of color TV

receivers. By Joseph Zauhar, ET/D Managing Editor.

30 DIGITAL FREQUENCY COUNTERS FOR SERVICING-Part 1

First of a two-part series which examines the theory of operation, specifications and

servicing applications of digital -readout frequency counters. By Joseph J. Carr,

ET/D Contributing Editor.

35 TECH BOOK DIGEST-Troubleshooting Horizontal Deflection & High -Voltage

Circuits-Part 1

A two-part series which analyzes the operation of horizontal deflection and high -

voltage circuits and explains how to isolate faults in them. By Ben Gaddis, TAB

BOOKS, Copyright 1974.

38 ET/D 1914 SUBJECT REFERENCE INDEX

Alphabetical listing of subjects and article titles by issue and page.

TEKFAX_Airline Models GAI -12925A, GAI -11245A, B and GAI -11265A, B; General Elec-

tric Ch. XA; Quasar Ch. ATS-, CTS- and TS -942; and Sylvania Ch. E11-1.

DEPARTMENTS

4 EDITOR'S MEMO

6 NEWS OF THE INDUSTRY

9 ELECTRONIC ASSOCIATION DIGEST

10 TECHNICAL LITERATURE

42 TEST INSTRUMENT REPORT

43 TECH DIGEST

44 NEW PRODUCTS

48 DEALER SHOWCASE

50 ADVERTISERS' INDEX

51 READER SERVICE

Mj A HARCOURT BRACE JOVANOVICH PUBLICATION ÁBp

HARCOURT BRACE JOVANOVICH PUBLICATIONS: James Milholland, Jr., Chairman; Robert L. Edgell,

President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,

Vice President; Thomas Greney, Vice President; Ezra Pincus, Vice President; Bruce B. Howat, Vice

President; James Cherna, Vice President.

ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications. Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 East

Ohio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial, Accounting, Ad Production and Circulation Offices: 1 East First Street Duluth, Minnesota 55802.

Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.

Other countries: one year $15, two years $24, three years $30. Single copies: 75e in the U.S.

and Canada; all other countries $2. Second class postage paid at Duluth, Minnesota 55806 and

at additional mailing offices. Copyright © 1975 by Harcourt Brace Jovanovich, Inc. All rights

reserved. No part of this publication may be reproduced or transmitted in any form or by any

means, electronic or mechanical, including photocopy recording, or any information storage and

retrieval system, without permission in writing from the publisher.

POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,

Minnesota 55806.


NOW! Protect against Transient Voltage Damage to TV, Stereo and Home Appliances with

d[SJ Metal Oxide Varistors. TV Set manufacturers know that many component failures are caused by voltage transients: lightning, voltage spikes and power surges. Now you can do something about it ... economically. Insert easy to install GE-MOV metal oxide varistors in component circuits and prevent damage from transient voltage once and for all. The varistor absorbs the dangerous transient and dissipates it as heat. The cost is low. The installation fast and easy. It's like offering your customers an insurance package ... and it's an opportunity to make a profit! Our GE-MOV program is ready and waiting. For all the facts about this addition to General Electric's growing replacement semiconductor line, see your authorized distributor.

TUBE PRODUCTS DEPARTMENT GENERAL ELECTRIC COMPANY OWENSBORO, KENTUCKY 42301

GENERAL ELECTRIC

EDITOR'S MEMO

CONTRIBUTING EDITORS

Beginning with this issue, two additional names-Joseph J. Carr, CET, and Bernard B. Daien, CET- appear on the masthead of ET/D.

Articles by these two knowl- edgeable and experienced technicians have been published in recent issues of ET/D and, because they were so well received by ET/D readers, we asked Mr. Carr and Mr. Daien to become contributing editors for ET/D. As such, they will author one article in each issçie and will function in an editorial advisory capacity as well as serving as additional "eyes and ears" in their respective areas of the country for the Duluth - based editorial staff.

Joe Carr has 15 years experience as an electronic technician and, while attending college, was an active partner in an auto radio servicing business. He has authored many books and articles about electronics and electronic servicing and is a Certified Electronic Technician (CET). Mr. Carr presently is a technician in the bioelectronics laboratory of George Washington University Medical Center in Washington, D.C.

Bernard Daien has over thirty years' experience as an electronic technician, engineer, teacher and author. He is a Certified Elec- tronic Technician and holds commercial and amateur radio li- censes. Mr. Daien previously was a senior systems engineer for Mo- torola Semiconductor Products Division in Tempe, Arizona, and now writes about and services electronic products in Phoenix, Arizona.

A SPECIAL "THANK YOU" TO ET/D READERS

On behalf of the entire ET/D staff, I want to thank the many readers who responded to the Reader Preference Survey in the November issue. Your cooperation in making ET/D even more re- sponsive to your needs and interests is appreciated. Again, thank you.


J. W. Phipps

Type EV - the space -saver 'Iytic [)[)[)[)[>[)[>[>[>1).[)[>[)

board room For space -saving 'lytic capacitor replacements on crowded printed

wiring boards found in most of today's foreign and domestic consumer

entertainment products, Sprague Type EV Verti-Lytic® Capacitors have

the widest range of values ... in the smallest case sizes . .. of any

single -ended capacitors available anywhere!

Get on Board with the KE-17 Assortment This handy assortment of 61 Type EV Capacitors in the 27 most -

popular ratings gives you an on -the -spot inventory of the

replacement capacitors you need for most of the sets you'll

encounter. Sturdy blue plastic cabinet has nine pre -labeled

drawers for fast, easy selection. And you pay for capacitors only

... the cabinet is yours at no extra cost!

See these "new era" capacitors at your Sprague

distributor's. Or, get the full story by writing for

Brochure M-951 to: Sprague Products Co., 65 Marshall

Street, North Adams, Mass. 01247. SPRAGUE° THE MARK OF RELIABILITY

THE BROAD LINE PRODUCER OF ELECTRONIC PARTS

... for more details circle 128 on Reader Service Card JANUARY 1975, ELECTRONIC TECHNICIAN/DEALER 15

NEWS OF THE INDUSTRY

Audio Product Sales Up in October But Overall Sales of Entertainment Electronic Products Sagged During First 10 Months of 1974

Although total sales to dealers of all audio categories of entertainment electronic products were up in October, sales of all entertainment electronic products except home FM radios during the first ten months of 1974 were below levels achieved during the same period in 1973, as revealed by the following statistics released by the Marketing Services Department of the Electronic Industries Association:

Television FIRST 10 MONTHS 1974 1973

% CHANGE

Monochrome 4,840,057 5,524,854 -12.4 Color 6,466,745 7,306,308 -11.5 TOTAL TELEVISION 11,306,802 12,831,162 -11.9

Radio AM 9,782,411 13,133,771 -25.5 FM 15,714,544 14,415,804 + 9.0 TOTAL 25,496,955 27,549,575 - 7.5 AUTOMOBILE 8,753,638 10,439,759 -16.2 TOTAL RADIO 34,250,593 37,989,334 - 9.8

Phonograph Portable & Table* 3,328,513 4,463,144 -25.4 Console 641,978 676,059 - 5.0 TOTAL PHONOGRAPH 3,970,491 5,139,203 -22.7

*Includes compact and component systems.

Sylvania Warranty Department at New Address The Labor Warranty Department of GTE Sylvania has been moved to 700 Ellicott St.,

Batavia, N.Y. 14020. All warranty labor claims and questions about warranty labor should be sent to this new address.

New York Fair Trade Law Upheld The New York Supreme Court, in a fair trade case involving Matsushita Electric Cor-

poration of America (Panasonic) and three stores of the JGE retail chain, has ruled that the Fair Trade Laws of New York State are not unconstitutional.

The Court has issued injunctions against the three JGE stores, restraining them from price cutting activities which the Court felt were jeopardizing the effectiveness of Mat- sushita's Fair Trade program in New York state.

1975 Consumer Electronics Show in Chicago June 1-4

The ninth annual Summer Consumer Electronics Show, sponsored and produced by the Consumer Electronics Group of the Electronic Industries Association, will be held June 1-4 at McCormick Place in Chicago.

Over 400 manufacturers and marketers of consumer electronic products will exhibit their new 1976 lines at the trade show, which is open to retailers, distributors, sales repre- sentatives and manufacturers. Retail -oriented audio, video and calculator conferences will be held during the show.

OSHA Recordkeeping Forms Revised Beginning this month, employers who have eight or more employees are required to

record occupationally related injuries and illnesses on a revised form which categorizes lost work days into two types: "days away from work" and "days of restricted work activity."

"Days away from work" are defined by the U.S. Department of Labor as any days on which an employee would have worked but could not because of occupational injury or illness.

"Days of restricted work activity" are defined by the Labor Department as days during which an employee was assigned to another job on a temporary basis, or worked at his regular job less than full time, or worked at his regular job but could not perform all duties normally connected with it because of occupational injury or illness. IN

6 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1975

How to crack the Japanese original equipment transistor problem.

Until now, there wasn't much you could do about the long delays in getting original transistor replacements for Japanese TV and audio equipment. IR has changed the picture. Now you can speed customer service with IR's DK22 Kit of 31 OEM transistors most often called out by Sony, Panasonic, Hitachi, JVC, Pioneer and

Toshiba, and for many sets made in Japan for Sears, Penney's, Montgomery Ward and others.

These are not "Universal Replacements." They are exactly the same parts used in

original equipment. They're made in Japan, but are now as close to you as your local IR Distributor. Each DK22 Kit contains one each of the 31 types listed in the box at

right to put exact replacements right at

your fingertips.

Last year, more Japanese -built TV's were sold in this country than any single U.S. brand. And the same

transistors are used in Japanese stereos, tape recorders and other entertainment equipment. Crack this fast-growing, lucrative service market with a DK22 Kit.

Call your local IR Distributor today. You'll get a $42.78 value for only $34.23... less than the price you'd pay

Japanese factory distributors.

DK22 Kit Japanese Transistors:

2SA495 2SC372 2SC281B 2SC535B 2SC710

256186A 2SC373 2SC537B 25C772

m. 2SB187 2SB367A

5 2SC454B 2SC403A0 2SC633A2SC634

2SC828A 2SC8298 2SC838

11411111 256474 2SB481 2SB481

2SC4588 2SC460B

2SC644A 2SC682A

2SC945

Zia

INTERNATIONAL RECTIFIE R Semiconductor Division

233 Kansas Street, El Segundo, California 90245, Phone (213) 678-6281

. for more details circle 115 on Reader Service Card


IOR

Now make almost all your replacements with RCA's medium-priced Colorama A's

That's the kind of socket coverage you can count on from this popular new "middle line" of RCA replacement color picture tubes. With just eight Colorama A types, you can cover almost all of the replacement market with "Grade A" performance at a price your customers can afford.

Every tube in the RCA Colorama A line is totally remanufactured. That's why they all can carry RCA's 18 -month inboarded warranty plus the option for an additional 12 months. Each has a completely new gun and a completely new screen made of the latest all -new rare-earth phosphors. In addition, every "V" type is made of advanced x-ray glass.

The RCA Colorama A line includes three Matrix types: CA-21VAKP22, CA-23VALP22 and CA-25VABP22. These advanced RCA Matrix tubes are as much as 100 percent brighter than any equivalent non -Matrix picture tube in RCA history.

So why not give your customers the "Grade A" choice. Choose Colorama A at your RCA Distributor today.

Remember, RCA is the world-wide leader in picture tubes, with over 65 million produced to date.

RCfI RCA/Electronic Components/Harrison, N.J. 07029


ELECTRONIC ASSOCIATION DIGEST Information about the activities of national, state and local associa-

tions of electronic servicers, dealers and manufacturers. Material

for publication in this department should be addressed to: Service

Association Digest, ET/D, 1 East First St., Duluth, Minn. 55802.

ETG of Rhode Island Elects New Officers

The Electronic Technicians Guild of Rhode Island, meeting in Pawtucket on Nov. 6, elected the following new officers, whose terms of office begin this month: Paul F. Kelley, Warwick, president; Donn C. DiBiasio, Providence, vice president; William Botelho, Warwick, secretary; Nor- man L. Lemieux, Attleboro, Mass., treasurer; and Thomas J. Plant, Jr., Pawtucket, corresponding secretary.

Pennsylvania ISCET Chapter Receives Charter, Elects Officers

The Pennsylvania Chapter of the International Society of Certified Electronics Technicians (ISCET) recently received its charter at a luncheon meeting in the Hilton Inn in Scranton.

Russell Scarpelli, owner of Scarpelli Electronics Service, Blakely, chairman of the new chapter, was presented the charter by John Risse of International Correspondence Schools, who represented Dick Glass, ISCET executive vice president. Other officers of the newly organized state chapter are: James Ibaugh, RCA, Lancaster, vice chairman; Ronald Lettieri, Tobyhanna Army Depot, Dunmore, secretary; and Hank Govan, Weston Instruments, Olyphant, treasurer.

FESA Chapter Sponsors Consumer "Hot line"

The Dade County Chapter of the Florida Electronics Service Association (FESA) has installed a consumer "hot line" telephone in the office of the chapter's recording secretary, John W. Dole, Dole TV & Radio, Miami.

The "hot line," which is connected to a telephone answering machine, was installed when the chapter reportedly found that the local Better Business Bureau was taking up to two months to handle consumer complaints. The "hot line" telephone number is listed in the Yellow Pages and has been publicized by local newspapers and radio and TV stations.

ESETRA Formed to Cope with Warranty -Related Problems

Elected officials of the National Appliance and Radio - Electronics Dealers Association (NARDA Inc.), the Na-

tional Alliance of Television and Electronic Service Asso-

ciations (NATESA), and the National Electronic Service

Dealers Association (NESDA) recently met in Louisville, Kentucky to form a special "blue-ribbon" committee which will attempt to come up with solutions to warranty -related problems.

Nolan Boone, president of the Television Service Asso-

ciation of Arkansas, was appointed coordinating chairman of the special national committee, which has been given the

name "Eastern States Electronics Technicians Regional Al-

liance" (ESETRA). In addition to the chairman, the committee consists of

two elected officials from each of the three national associa-

tions (NARDA, NATESA and NESDA). Included among the warranty -related problems the com-

mittee will study are labor rates, parts availability, slow payment by manufacturers, and the additional costs of in -war-

ranty servicing.

BEFORE YOU

BUY A SWITCH... CONSIDER THIS- ECTROOPJ1FT GIVES YOU ...

More than 120 switches and accessories of all

types and styles

All displayed on one

fixture for easy selec-

tion

Also available in bulk put -ups for quantity users.

Attractive, easy to read bubble pack

cards with specific, pertinent product information.

Cal. No. 351510 5195

2 Pos/On-On o, On -of

BAT HANDLE TOBBLE . Sol . T.,m.%

13111,. Hole 15/321R 1/2 inch. . R., 3A 125V/1 A.250V AC/DC

c1

48 page

catalog complete with technical specs,

templates and cross reference also available

GC ELECTRONICS ELECTRONICS DIVISION OF HYDROMETALS, INC.

ROCKFORD, ILLINOIS 61101 U.S.A. O J



TECHNICAL LITERATURE

Alarm/Security Cable A revised 12 -page expanded catalog

of electronic wire and cable for alarm/security applications has been published. The catalog simplifies selection of wire and cable by installers, specifications and systems engineers, systems contractors, and maintenance personnel concerned with surveillance, detection, alarm, and communications

equipment. More than 00 individual wire, cable, and cord designs are included in the catalog. Catalogued for the first time are 42 vinyl -insulated multiple -conductor control and audio cables (not paired), seven single -conductor hook-up wire designs, and three portable cord constructions. Beld- en Corp., Advertising Dept., 2000 S. Batavia Ave., Geneva, IL. 60134.

Semiconductors and Accessories A 148 -page SK -Series Top of the

Line Replacement Guide, No. SPG- 202P, is now available. The guide lists

WHEN YOU'VE gar SOLID STATE SENSITIVITY

IN A 5" GENERAL SERVICE' SCOPE WI1H TV -V

&TV-H..YOU'VE GOT

LEADER .

What's more, the 1.80-511 delivers calibrated vertical input along with rock -like stability, recurrent sweep and automatic synchronization. This outstanding wide -band oscilloscope/vectorscope is the newest in a series of solid state instruments, Leader developed to give you more for your money. Sweep frequency is in 4 ranges from 10Hz to 100Hz and we've added a versatile phasing control, continuous from 0 to 140°. Overall sensitivity is 20mVp-p/cm to 1OVp-p/cm

BO -511

and vertical input is calibrated The solid-state stability and distortion -free dsplays are the result of Leader's exclusive FET npLt stages plus DC coupling and push-pull amp' fiers. Bandwidth is DC to 10MHz. And, there are special inputs to obtain vectored pattern displays for colar TV circuit testing. Complete with prdre, adapter and test leads, the LBO -511 weighs just 15 lbs. and is unusually compact.

"Put us to the test"

$299.95

LEADER151 Dupont Street, Plainview, L.I., N.Y. 11803 (516) 822-9300 INSTRUMENTS CORP.

.. . for more details circle 117 on Reader Service Card

87,000 SK -Series solid-state replacements which include transistors, rectifiers, thyristors and integrated circuits. The guide is a comprehensive and accurate source of solid-state replacement information. The 87,000 semiconductor devices are cross-referenced to the SK -Series replacement semiconductors. The Replacement Program is composed of devices for uses as replacements in entertainment and industrial type equipment. Price $.90. RCA/Distributor Products Marketing, Route 202, Somerville, NJ. 08876.

Radio/TV Repair Course A 6 -page pamphlet describing its

radio and TV service and repair course is now available. It briefly dis- cusses course topics and career opportunities for individuals interested in working directly in radio and TV service and repair as well as in related fields. Advance Schools, Inc., is a national home -study school accredited by the accrediting Commission of the Na- tional Home Study Council. ASI Market- ing Communications, Dept. TV, 5900 Northwest Highway, Chicago, IL. 60631.

Professional Tools and Safety Equipment

An 80 -page catalog of specialized professional hand tools and safety equipment is now available. The catalog is organized for easy reference and fully indexed-both alphabetically and by product number. Tools and safety equipment are illustrated with large photographs and drawings. Many illustrations utilize a second or third color for added clarity of special features. Concise product descriptions, specifications, and catalog numbers make selection simple. Mathias Klein &

Sons, Inc., 7200 McCormick Road, Chi- cago, IL. 60645.

Solid -State Product Guide A 40 -page Solid -State Product

Guide No. SPG-201K is now available. This booklet contains abbrevia- ted data for the commercial solid-state products available from the RCA Sol- id State Division. Data is given for In- tegrated Circuits (Linear and Digital) and discrete devices (power transistors, RF transistors, MOS transistors, triacs, silicon controlled -rectifiers, diacs, and rectifiers. Complete data on individual devices can be obtained by reference to the technical bulletins listed by file number or to the RCA Solid -State DATABOOK Series (SSD - 2001); the publications are available from RCA Solid State Division, Box 3200, Somerville, NJ. 08876.


Our Television Systems will sell your Televisions Color TV sells on demon-

stration. The better the demonstration the quicker the sale. Nothing is more embarrassing than to demonstrate a fine TV set and find the picture rolling, the color balance changing. And it can happen, just at the wrong time.

One of the ways you can make sure that it won't happen is by using Blonder - Tongue distribution systems. Blonder -Tongue offers a wide choice of systems for color TV, black and white, and hi-fi component demon- strations. Any number of outlets, for best performance in any area-big city, suburbs

or deep fringe. We've got the products

from antennas to -V terminals. Most important we have the know-how gained through thousands of showroom system installa-

tions over the past 24 years. We offer you a layout of

a showroom TV system tai- lored to your store layout and reception area. It's free. Use coupon below for a

survey request form.

Blonder -Tongue Laboratories, Inc. One Jake Brown Rd.Old Bridge, N.J. 08857 Please send me a survey request so I can Tb Showroom System provide information required for a system Layout layout for my store.

Name

Company

Address

City State Zip

BLONDER TONGUE since 1950, leader in TV reception products.

... for more details circle 104 en Reader Service Card


A vacuum tube "wears out" over a period of time because the coating on its cathode becomes "depleted," reducing the number of electrons emitted from the cathode to the plate.

Transistors do not "wear out." If a transistor is normal when it is installed in a circuit, it usually will continue to perform within its design limits until some circuit defect or abnormal operating condition causes excessive voltage across or excessive current through one or more of its three junctions (emitter - base, base -collector or emitter -collector). The excessive voltage and/ or excessive current will cause either 1) catastrophic failure of the junction (it becomes open or shorted) or 2) the transistor will develop excessive leakage or noise.

Most transistor failures are "complete" shorts or opens, either base to emitter, base to collector, or emitter to collector. (The emitter -to - collector short can exist even though the emitter -to -base and collector -to - base junctions test normal for both forward and reverse conduction. So never omit testing for shorts between collector and emitter, even if you have made the other tests.)

The incidence of leakage in most modern transistors is not as preva- lent as it was in germanium devices made several years ago. Unfortu- nately, you may run across an older receiver which uses the early germanium transistors, or you may

Testing Bipolar Transistors In and Out of Circuit By Bernard B. Daien, ET/D Contributing Editor

Tips about the simple resistance and voltage measurements you probably are using to uncover most defective transistors

have some old stock on hand. It is good practice to discard any transistors bought prior to 1965, or, at least, put them into your "private" collection or use them for "home brew" projects. It isn't worth risking a callback for a device that can be bought today for a dollar or so.

An unusually noisy transistor should also be replaced, because there is a direct connection between noisy transistors and premature failures.

If a circuit failure subjects the transistor to a substantial overload, it is a good practice to replace the transistor, because gain, leakage, and junction voltage drops might be adversely affected.

Q io

SIUCON , I, A 6 8

FORWARD VOLTAGE

1.o

Fig. 1-Forward voltage-forward current curve of a typical silicon bipolar transistor.

OUT -OF -CIRCUIT TESTS

Although it is recommended that the voltages across the junctions of the transistor be measured before the transistor is removed from the circuit for ohmmeter tests, in this article ohmmeter tests will be discussed first because a thorough understanding of the junction characteristics involved in ohmmeter tests make it easier to understand and in- terpret the causes of abnormal voltages across the transistor junctions.

First, let us look at the forward voltage drop across a basic silicon junction with various levels of current through it. Fig. 1 shows that different levels of current cause different voltage drops. At 0.01 ma we read about 0.38 volts. At 1ma, 0.62 volts. At 10ma, 0.78 volts. At 100ma, 1.0 volts. Note that although the current through the junction has been increased by a factor of 10,000 (from .01ma to 100ma) the voltage drop across the junction has increased by a factor of only less than 3. This reveals that the resistance (E/I) of the junction is nonlinear; that is, an increase of current through the junction does not produce a proportional increase in the voltage drop across it.

The junctions of germanium transistors also exhibit nonlinear resistance characteristics, as revealed by the forward voltage -forward current curve in Fig. 2.

The nonlinear resistance charac- 12 ELECTRONIC 1ECHNICIAN'DEALER, JANUARY 1975

INTRODUCING AT JUST

WITH CABLES

EATU RES

A UHF Tuner with 70 channels which are detented and indicated just like VHF channels.

A VHF Hi Gain Solid State Tuner.

Demonstrate the PrrgrirOM to your customers and show improved reception with their TV sets.

You may place your order through any of the Centers listed below.

WATCH US GROW

ONE YEAR GUARANTEE

STILL ONLY

ONLY

ALL PARTS INCLUDED

EXCEPT TUBES AND TRANSISTORS

PROVIDES YOU WITH A COMPLETE SERVICE FOR ALL YOUR TELEVISION TUNER REQUIREMENTS.

REPAIR VHF OR UHF ANY TYPE (U.S.A. ONLY) $ 9.95 UHF/VHF COMBINATION (U S . ONLY) $15.00

IN THIS PRICE ALL PARTS ARE INCLUDED. Tubes, transistors, diodes, and nuvistors are charged extra. This price does not include mutilated tuners. Fast, efficient service at our conveniently located Service Centers. All tuners are ultrasonically cleaned, repaired, realigned, and air tested.

UNIVERSAL REPLACEMENT TUNER $12.95 (Canada $15.95)

This price buys you a complete new tuner built specifically by Sarkes Tarzian Inc. for this purpose.

All shafts have a maximum length of 101/2" which can be cut to 11/2".

Specify heater type parallel and series 450 mA. or 600 mA.

CUSTOMIZE Customized tuners are available at a cost of only $15.95. With trade-in $13.95. (Canada $17.95 and $15.95)

Send in your original tuner for comparison purposes to Franchises listed below.

HEADQUARTERS BLOOMINGTON, INDIANA 47401 537 South Walnut Street Tel. 812-334-0411

ARIZONA . TUCSON, ARIZONA 85713 P.O. Box 4534, 1528 S. 6th St. Tel. 602-791-9243

CALIFORNIA ,. t ORTH HOLLYWOOD, CALIF. 91601 10654 Magnolia Boulevard Tel. 211-769-2720

(21 MODESTO, CALIF. 95351 RLINGAME, CALIF. 941 1324 Marsten R

o f nue . Tgg. 4 -347:5728

= ' -521-8051

FLORIDA FLORIDA r TAMPA, FLORIDA 33606 1505 ypress -rp . 8 3-253-0324

HIALEAH, FLORIDA 33013 906 =:s! 25t el. a'5-836-7078

GEORGI ` ATLANTA, GEORGIA 30310 938 Gordon Street ^r Tel. 404-75.8-2232

ILLINOI AMPAIGN, ILLINOIS 8182 405 East University 2404,7586:62420302

HIQAGO, ILLINOIS 60621' 737 West 55th Stree .. Tel -873-5556-7 K` IE, ILLINOIS 60076 ........... 5110 West Brown S ' Tel ` 2-675-0230

INDI 1 MOND, INDIANA 46323 6833 Grand Avenue 9-845-2676 NAPOLIS, INDIANA 4 112 West St. Clair 7-632-3493

KENTUCKY e' ILLE, KENTUCKY 40 08 Taylor Boulevard 02-634-3334 \' LOUISIANA EPORT, LOUISIANA 7 104 3025 Highland A u 18-861-7745

MARYLAND B TIMORE, MARYLAND 2 215 5505 Reisterstow 1-358-1186

MISSOURI ST. LOUIS, MISSOURI 631 a Page Av 14-429-0633 NEVADA LAS VEGAS, NEVADA 8910 ... ,12 Western Ave 702-384-4235

NEW JERSEY TRENTON, NEW JERSEY 0; '38 ... 01 North Olden ven e .. el. 609-393-0999

JERSEY CITY, NEW JERSE 07307 ....... 54 -49 Tonnele A e., wy.1 - el. 201-792-3730

OHIO CINCINNATI, OHIO 45216. .... 7450 Vine Street Tel. 513-821-5080

CLEVELAND, OHIO 44109. .... 4525 Pearl Road .. Tel. 216-741-2314

OREGON PORTLAND, OREGON 9721 1732 N.W. 25th Ave ... - Tel. 503-222-9059

TENNESSEE GREENEVILLE, TENNESSEE 37743 . 1215 Snappa F - ' el. 615-639-8451 MEMPHIS, TENNESSEE 38111 ..... . .. 3158 Barron Avenue . 901-458-2355

TEXAS DALLAS, TEXAS 75218 1540 Garland Road . 214-327-8413

VIRGINIA NORFOLK, VIRGINIA 23513 3 '5 Santos Street 804-855-2518

CANADA ST. LAURENT, QUEBEC H4N-2L7 305 Decarie Boulevard Tel. 514-748-8803

CALGARY, ALBERTA T2H-OL1 448 42nd Avenue S.E Tel. 403-243-0971 P.O. Box 5823, Stn. "A"

IF YOU WANT TO BRANCH OUT INTO THE TV TUNER REPAIR BUSINESS, WRITE TO THE BLOOMINGTON HEADQUARTERS ABOUT A FRANCHISE.

... for more details circle 130 on Reader Service Card JANUARY 1975, ELECTRONIC TECHNICIAN/DEALER 13

teristic of transistor junctions and the fact that each range of an ohmmeter applies a different value of current to the junction are the reasons that the amount of resistance measured across a transistor junction depends on which ohmmeter range is used. This is illustrated in Tables 1, 2 and 3, which list the resistances of forward and reverse

biased junctions of typical germanium and silicon power transistors. (The resistances were measured with a Simpson Model 260 VOM, which has 20,000 ohms/volt input resistance, a 50 microamp meter, and produces about 50ma of current through the junction in the RX1 range, about .50ma in the RX100 range and 50 microamps in

TABLE 1

METER

RANGE

RX1

RX100

RX10K

FORWARD BIASED JUNCTION RESISTANCES GERMANIUM

B -E B -C

4 ohms 4 ohms

100 ohms 100 ohms

0 ohms 0 ohms

SILICON

B -E B -C

9 ohms 9 ohms

550 ohms 550 ohms

7000 ohms 7000 ohms

TABLE 2

REVERSE BIASED JUNCTION RESISTANCES METER GERMANIUM SILICON RANGE B -E B -C B -E B -C RX1 Inf. Inf. Inf. Inf. RX100 50K ohms 50K ohms Inf. Inf. RX10K 150K ohms 150K ohms 1.5 meg ohms Inf.

.8

.7

.6

5

.4

.3

.2

.09

.08

.07 .06 .05

.04

.03

.02

.01 .009 .008 .007 .006

.005

.004

.003

.002

.001

GERMANIUM

.1 .2 .3 .4 .5 .6

FORWARD VOLTS

Fig. 2-Forward voltage-forward current curve of a typical germanium bipolar transistor.

METER RANGE

RX1

RX100

RX10K

TABLE 3

EMITTER -COLLECTOR JUNCTION RESISTANCES

(REVERSE BIAS ON COLLECTOR)

GERMANIUM SILICON E -C E -C

400 ohms Inf.

50 ohms Inf.

0 ohms Inf.

Fig. 3-The leakage current indicated by the arrows is the reason that germanium power transistors inherently have low reverse -bias emitter -to -collector resistance.

the RX 10,000 range.) Note that in Table 1 the base -to -

emitter and base -to -collector forward resistances are the same. Al- so note in Table 1 that, because of the inherently higher leakage of germanium transistors, the RX1 and RX 10K ranges produced completely misleading readings for the germanium junctions (RXIOK range falsely indicates shorted junctions) and less than conclusive readings for the silicon junctions. On the other hand, the RX 100 range provides relatively accurate readings which would clearly reveal a shorted or open junction.

Note in Table 2, which lists the reverse bias resistances for the same junctions, that the RX100 range again produces conclusive readings which would clearly disclose open or shorted conditions, while the RX1

VOLTAGE SLIGHTLY OVER NOPMAL+

.12V (A) EMITTER OPEN INTERNALLY

+12V

DV

SAME AS BASE TO GROUND

OPEN /

(B) EMITTER CIRCUIT OPEN

OV

LOWER THAN

NORMAL

y12V

B -E SHORT

SAME AS BASE TO

GROUND

J y1 V

(C) SHORTED B -E JUNCTION

2V

+12v

Fig. 4-Typical emitter -related defects and associated voltage symptoms in a common - emitter circuit.


and RX1OK ranges again produce inconclusive or misleading readings.

Table 3 lists the emitter -to -collector resistances of the same transistors, with the collector reverse biased just as it would be during normal in -circuit operation. Note that the inherently higher leakage of

the germanium transistor produced a completely misleading reading on the RX1OK range, but, again, the RX100 range produced a conclusive reading which would reveal a short or open condition, if either existed.

To understand why germanium power transistors have such low emitter -to -collector resistance when reverse biased, refer to Fig. 3. Note that any leakage across the base -to - collector junction has nowhere to go if the base is open (or if there is a

very high resistance between base and emitter). The leakage therefore crosses the forward -biased emitter - to -base junction in order to complete the circuit. Any current flowing through the emitter -to -base junction is amplified by the transistor,

(A) BASE OPEN INTERNALLY

(B) BASE CIRCUIT OPEN

ALLER

NORVAL

ALOE REDUCED

NORMAL

1 SMALLER

NORMAL

J ICI BASE BIAS RESISTOR REDUCED

Fig. 5-Typical base -related defects and asso-

ciated voltage symptoms in a common -emitter circuit.

and a larger current then flows between emitter and collector. Thus, when the base is open, the collector junction leakage is amplified by the current gain of the transistor and the emitter -to -collector path be -

(A) COLLECTOR OPEN INTERNALLY OR EXTERNALLY

.,EY (B) COLLECTOR BASE SHORT

=ro=ER =AN

NORMAL

J

(C) COLLECTOR EMITTER LEAKAGE

Fig. 6-Typical collector -related defects and

associated voltage symptoms in a common -

emitter circuit.

Fig. 7-Internal circuitry of a Darlington tran-

sistor.

comes a low resistance. Even modern germanium transis-

tors have higher leakage than silicon transistors, and power transistors have higher leakages than small -signal transistors. Therefore, the leakage of a germanium power transistor can be considerable. If you stick with the RX10 or RX100 ranges (whichever your meter has) you will avoid most of the leakage problems.

Semiconductors are temperature sensitive devices. Leakage doubles for every 10 -degree C temperature rise. Therefore, transistors operating in circuit will have greater leakage than that measured "cold" out of circuit. Typically the junction temperature for germanium transistors may go as high as 70 degrees or more, representing an increase in "hot" leakage current of about 15

times over "cold" junction leakage. To make matters worse, the emit-

ter -to -base junction has a negative temperature coefficient (as the temperature increases the required forward bias decreases). Thus, for a given bias, collector current tends to increase as the temperature increases. The combination of these two effects causes significantly higher currents to flow in a leaky transistor as it heats up. If you find a transistor that appears to have more leakage than similar devices, and you are doubtful about it (remember, it's going to get worse as it heats up in the set), replace it and save yourself a callback. This applies particularly to germanium devices used in auto radios, some portable radios and in older sets. Modern silicon transistors tend not to leak. They are either normal or open or shorted, and not much else.

Another reason for using only the RX 10 or RX100 range of your VOM is that the RX1 range of many VOM's applies 100ma or more of current to a junction under test. This level of current is sufficient to damage the base -to -emitter junction of some low -power transistors and the junction of signal diodes.

If you are not already thoroughly familiar with the junction resistance readings produced by your VOM, use it to make readings of the forward- and reverse -biased junction resistances of known -good germani -


ANY3

An Extraordinary Offer to introduce you to the benefits of Membership in

ELECTRONICS BOOK CLUB for a limited time only you can obtain

OF THESE UNIQUE BOOKS ...with Trial

(Combined List Price $45.85) Club Membership

el . yours for only C each

May we send you your choice of any three books on the facing

page as part of an unusual offer of a Trial Membership in Electronics Book Club ?

Here are quality hardbound vol- umes, each especially designed to help you increase your know-how, earning power, and enjoyment of electronics.

These handsome, hardbound books are indicative of the many other fine offerings made to Members ... important books to read and keep ... vol- umes with your specialized interests in mind.

Whatever your interest in electronics -radio and TV servicing, audio and hi-fi, industrial electronics, communications, engineering -you will find Electronics Book Club will help you.

With the Club providing you with top quality books, you may broaden your knowledge and skills to build your income and increase your understanding of electronics, too.

How You Profit From Club Membership

This special offer is just a sample of the help and generous savings the Club offers you. For here is a Club de- voted exclusively to seeking out only those titles of direct interest to you. Membership in the Club offers you several advantages. 1. Charter Bonus: Take any three of the books shown ... plus the FREE Bonus book worth $7.95 (combined values to $53.80) for only 99e each with your Trial Membership. 2. Guaranteed Savings: The Club guarantees to save you at least 25% to 75% on all books offered. 3. Continuing Bonus: If you continue after this trial Membership, you will earn a Dividend Certificate for every book you purchase. Three Certificates, plus payment of the nominal sum of $1.99, will entitle you to a valuable Book Dividend which you may choose from a special list provided members. 4. Wide Selection: Members are an- nually offered over 50 authoritative books on all phases of electronics. S. Bonus Books: If you continue in the Club after fulfilling your Trial Membership, you will receive a Bonus Dividend Certificate with each addi-

SPECIAL FREE BONUS

. . if you act now !

Yes, if you fill in and mail the Mem- bership Application card today, you'll also get this Bonus Book, FREE!

TV TROUBLESHOOTER'S HANDBOOK Revised Second Edition

A completely updated quick -reference source for solutions to hundreds of tough -dog troubles.

Regular List Price $7.95 (for a total combined list price of $53.80!)

tional Club Selection you purchase. For the small charge of only $1.99, plus three (3) Certificates, you may select a book of your choice from a special list of quality books periodical- ly sent to Members. 6. Prevents You From Missing New Books: The Club's FREE monthly News gives you advance notice of important new books ... books vital to your continued advancement.

This extraordinary offer is intended to prove to you, through your own experience, that these very real advantages can be yours ... that it is possible to keep up with the literature published in your areas of interest ... and to save substantially while so do- ing.

How the Club Works

Forthcoming selections are described in the FREE monthly Club News. Thus, you are among the first to know about, and to own if you desire, significant new books. You choose only the main or alternate selection you want (or advise if you wish no book at all) by means of a handy form and return envelope enclosed with the News. As part of your Trial Member- ship, you need purchase as few as four books during the coming 12 months. You would probably buy at least this many anyway . without the substantial savings offered through Club Membership.

Limited Time Offer!

Here, then, is an interesting opportunity to enroll on a trial basis ... to prove to yourself, in a short time, the advantages of belonging to Electron- ics Book Club. We urge you, if this unique offer is appealing, to act

promptly, for we've reserved only a limited number of books for new Mem- bers.

To start your Membership on these attractive terms, simply fill out and mail the postage -paid airmail card today. You will receive the three books of your choice for 10 -day inspection. SEND NO MONEY! If you are not delighted, return them within 10 days and your Trial Membership will be cancelled without cost or obligation. Electronics Book Club, Blue Ridge Summit, Pa. 17214.

Typical Savings Offered Club Members on Recent Selections

RCA Color TV Serv. Man's. Vols. 3 & 4 Ea. List Price $8.95; Club Price $5.95

CET License Handbook List Price $8.95; Club Price $5.95

TV Bench Servicing Techniques List Price $7.95; Club Price $4.95

Practical Test Instruments You Can Build List Price $7.95; Club Price $4.95

Elec. wiring & Lighting for Home/Office List Price $7.95; Club Price $4.95

Modern Communications Switching Sy. List Price $17.95; Club Price $13.95

Computer Technician's Handbook List Price $12.95; Club Price $8.95

Color TV Trouble Factbook-2nd Ed. List Price $8.95; Club Price $4.95

Solid -State Circuits Guidebook List Price $8.95; Club Price $5.95

Installing TV & FM Antennas Lis' Pace 57.95; Club Price 53.95

Understanding & Using the VOM & EVM List Price $7.95; Club Price $4.95

Modern Applications of Linear IC's List Price $12.95; Club Price $9.95

FM Stereo/Quad Reevr. Servicing Man'I List Price $7.95; Club Price $4.95

Electronic Music Production List Price $7.95; Club Price $3.95

Auto Stereo Service & Installation List Price $8.95; Club Price $5.95

Getting Most out of Elec. Calculators List Price $7.95; Club Price $4.95

Mobile Radio Handbook List Price $7.95; Club Price $4.95

Elec. Test Equipment/How To Use It List Price $7.95; Club Price $4.95

Indexed Guide To Modern Electr. Circs. List Price $7.95; Club Price $4.95

Electronics For Shutterbugs List Price $8.95; Club Price $5.95

Introduction to Medical Electronics List Price $9.95; Club Price $6.95

Cassette Tape Recorders List Price $7.95; Club Price $4.95

MATV Systems Handbook List Price $7.95; Club Price $4.95

How to Repair Small Gasoline Engines List Price $8.95; Club Price $4.95

SENDN O MONEY! Simply fill in and mail postage -paid Airmail l card today!

CAN System Engineering - Third Edition. Re- vised Third Edition of the accepted technical standard of the CATV industry an expanded and revised version of the first and only authoritative book on plan- ning, designing,_and operating a CIATV plant. Covers systems composed of uncor- related components

as well as fully integrated solid-state

aatguuaolfiersigedvnaeosmpi include

con- cepts, high level distribution, principles of cable powering, amplifier and system dynamic range, cascaded figure of merit, system operating levels, jumper cables, equalization and alignment and a host of other vital subjects,including how to mod- ernize older systems using the newest equipment available. 256 pps.

List Price $12.95 Order No. 298

Dictionary of Electronics You'll find this huge volume extremely useful in whatever connection you have with electronics. This dictionary of electronics defines most all of the electronic terms you will run across in your everyday reading ... from alpha particles through zoom lens

defines the terms you need and use most often. including those found in radio, TV, communications, radar, electronic instrumentation, broadcasting, industrial electronics. etc. It provides full, complete and easily -understandable explanations of thousands of specific electronics terms (auch as transistors, acoustic feedback, alpha particles. beat oscillator, final anode, electro- static lens. nonlinear resistance, etc.) .

420 pps., 487 illustrations. Hard- bound.


Major Appliance Repair Guide Everything you need to know to fix any major electrical appliance is contained in this comprehensive. up-to-date volume. The authors ex- plain every step in great detail. and illustrate typical situa- tions with detailed photos and drawings. Numerous troubleshooting charts help

you pinpoint the cause of virtually any problem in a matter of minutes. Repair procedures are included for dishwashers, clothes washers, dryers water heaters, garbage disposers, and ranges, using typical models and case -history data drawn from actual experience. In every case, the material is based on practical, down-to- earth reasoning and techniques. 288 PPS.. over 260 illus. Hardbound.


Pictorial Guide to CB Radio Installation & Repair

A step-by-step approach to setting up a two-way radio in the home or car- the simple techniques outlined are equally applicable to commercial and ham systems. Com- plete guide to the proper installation, checkout, and maintenance of all types of modern transceiv-

ers and antennas, both mobile and fixed. Covers reducing TV interference, minimizing possible lightning damage, setting up a telephone -to- radio interconnection, and antenna setup and site selection. Shows, in pictures and text, how to optimize the coaxial line, tune the antenna, reduce cable length to increase antenna gain, etc. 256 pps. Hardbound.


Old m.w larde .n 1º Nub 1.e.talanion e lap.'

FET Applications 'Handbook This revised 2nd edition contains a wealth of data on the FET and its various applications in practical circuit designs material pre- pared by some of the most capable engineers in the field. Early Chapters delve into current -voltage relationships, application areas, DC

and AC amplifiers, voltage controlled attenuators, and limiter and chopper circuits. Additional Chapters deal with linear applications, chopper and switching circuits, integrated circuits and photo -PETS. Also FET oscillators. describing various types and the necessary biasing arrangements. Es- sential design data includes starting conditions, power output, frequency stability, and efficiency. 320 pps., 250 illus., 26 Chapters. Hardbound.


Practical Test Instruments You can build

An arsenal of highly useful, economi- cal, easy -to -build test equipment designed by the people who use it everyday., Selected for their general usefulness to the electronic and servicing professions, these projects are capable of being built and put to use in a single eve-

ning, and they make optimum use of inexpensive components. Project areas have been divided into these discrete Sections: semiconductor testing devices; measuring volts ohms, and rf watts; dip meters and wavemeters; and useful test and measurement circuits. Wherever your technical interest lies, you'll find ideal projects tailor-made to your own requirements. 204 pps., 157 illus. Hardbound. List Price $7.95 Order No, 669

ttrtAl Te.t erit54tornExtS' VOU

rnn euae

eem

Industrial Electronics: Principles & Practice

A comprehensive text providing an in- depth treatment of modern industrial control, processing and monitoring methods. including many of the latest innova- tions brought about by advances in solid- state electronics technology. You'll learn about the methods and devic-

es used to automatically inspect, sort, and count, and about digital process control techniques that "tell" machines how to perform repetitive operations. Also covered are electronic heating, welding and machining devices, plus ultrasonic cleaning, liquid processing, and laser applications. 416 pps., 380 illus. Hardbound.

mSÓ K ELECTRONICS

8 INOPLES

PRACTICES


Handbook of Semiconductor Circuits

Contains 124 examples of standard transistor circuits. complete with opera- tional data for am-

lplifiers, oscillators,

ogic and switching circuits, power supplies and various nonlinear circuits. The broad range of circuits included were selected on the basis

plication and practicality. A design philosophy

of a

section is included with each group of circuits, thereby providing a basis for understanding circuits other than those selected as examples. This is a collection of practical circuits which have wide application. Each circuit description includes data con- cerning any unique design or opera- tional data. Hundreds of illustrations and diagrams. 448 pia., 6" x 9". Hardbound. List Price $8.95 Order No. G-30

Electronic Circuit Design Handbook

New Fourth Edition -A brand-new, en- larged edition of the ever popular circuit designers "cookbook." now contain- ing over 600 proven circuits, for all types of functions, selected from thousands on the basis of original- ity and practical application. Now you can have, at your

fingertips, this carefully planned reference source of tried and tested circuits. Selected on the basis of their usefulness, this detailed compilation of practical design data is the answer to the need for an organized gathering of proved circuits . . both basic and advanced designs that can easily serve as stepping stones to almost any kind of circuit you might want to build. 416 pps., 19 big sections, over 600 illus. 8% " z 11". List Price $17.95 Order No. T-101

Understanding & Using the Oscilloscope

Using a scope is as easy as A -B -C, and this down-to-earth text shows how it's done. This excellent guidebook is designed especially for technicians who'd like to become more familiar with the most versatile piece of test equipment ever devised, and for the beginner who

wants to get started in servicing the right way. It's packed with info on scopes of every type, with special emphasis on solid-state circuits. De- scribes basic functions, scope circuits, ac vs. de inputs, differentiated and integrated pulses and waveforms, and outlines every conceivable electronic test you're likely to perform on any equipment . ever! 272 pps., 170 illus. Hardbound. List Price $7.95 Order No. 664

UnMStaMYt9 L

uº+º Ire

e;i«

Auto Stereo Service & Installation

An indispensable one -stop source of info (including how to get rid of interference) for all types of auto stereo equipment,. plus

installation stallation procedures for FM radios, 8 -track cartridge units, and cassette players. In- cludes 48 complete schematics of 13

major manufacturers. Contains one of the most lucid descriptions of magnetic -tape theory ever published. The text on installation is very thorough and detailed-even to showing how to make a hole in car- peting; general maintenance covers the mechanical aspects-dial cord and lamp replacement, replacing controls, demagnetizing, tape splicing, etc, 252 pps., 245 illus. Hardbound. List Price $8.95 Order No. 694

Acoustic Techniques for Home & Studio

Complete coverage of a neglected subject! Two related areas- audio and acoustics -are neatly tied together in this single volume aimed for the hi -fl buff as well as the professional broadcast and recording studio technician. If you can handle simple algebra and read a

graph, you'll be at ease with this book's design treatment for assuring maximum fidelity-not at the loud- speaker, but at the ear, where good sound really means something. With proper application of the techniques and tests outlined, you can determine what your room acoustics lack and what to do to improve them-at minimum cost. 224 pps., 168 illus. Hardbound. List Price $7.95 Order No. 646

LCOUtTK rODUOU[i oa w nut.

on eras. soar

Kwik-FuirmTV Service Manual By Forest Belt, all the data you need to speed color -TV diagnosis and repair to the point where it's "Turn it on, check it out, and fix it up"-just like that! Each of the 30 sections contains a circuit description, typical schematics, signal analysis, voltage

charts, and waveforms-condensed into easy -to -use, step-by-step troubleshooting charts that will help solve almost any TV trouble in double-quick time. With typical photos and scope traces, this manual will lead you quickly from symptom to repair. Normal and abnormal waveforms, taken from representative TV receivers, pinpoint problems that might otherwise keep you guessing. 384 pps., hundreds of illus. List Price $8.95 Order No. 611

Zenith Color TV Service Manual -- Vol. 3

Jam-packed with more information than ever before, this all -new Zenith color TV manual provides all the servicing data you'll ever need for these models: 140014, 15, 15Z, 16 16Z; 14CC14 (and up); 180C27, 29, and 30; 190011 and 12; 19DC19Z and

20. 20CC50 and 50Z; 23DC14; 25(SC25, 50, and 55; 250056; in addition to the brand new 1974 17/19EC45; 25EC58 series just released. Contains complete alignment and service instructions, new - circuit descriptions, schematics, and complete test -point waveform photos -I'LL'S 15 full-size right -up-to-the- minute schematics! 180 pps., including 36 -page Schematic -foldout section. Leatherette cover. List Price $7.95 Order No. 668

ZENITH J

Commercial FCC License Handbook

A new and unique study guide and reference manual, combin- ing theory and applications with up-to- date questions and answers for lst 2nd, 3rd class radiotele- phone license exams plus broadcast and radar endorsements. Everything you need to know is included- complete detailed an-

swers to questions on any subject you may be asked when you take your exam. Numerous practical examples are used to describe the various principles you need to understand the exam questions. In each case, the author painstakingly explains the answers to questions on all subjects. Prepares you for any exam. 444 pps.. 150 illustrations. Hardbound. List Price $9.95 Order No. 582

Ten -Minute Test Techniques for PC Servicing

This new Art Mar- golin "classic" is a

lractical, easy -to -fol-

ow PC board repair guide with scores of shortcuts for the beginner or pro. You'll learn how printed - circuit boards are made and how components are mounted; replacement techniques for damaged boards; soldering and

desoldering; plus the tools and chemicals needed. Reveals unique tricks used by the pros to remove and replace components without damaging fragile printed boards. The author delves into "flow chart" servicing and shows how these troubleshooting roadmaps can cut sertie- ing time. 216 pps., 114 illus., 16-

Mppa,gg

e0

aSnchd

emaco Section .

for rAdbomn


ieeluelaw. for PC 41.111.

AN EXTRAORDINARY OFFER... ... for more details circle 105 on Reader Service Card

um and silicon transistors and list them on a small chart pasted to the side of your VOM.

Two other notes of caution: 1) Check the voltage between the test leads of your ohmmeter. Some ohm- meters have 6 or more volts between their test leads in the high -ohms ranges. This amount of voltage can damage some "delicate" transistor junctions. 2) Check the polarity of your ohmmeter test leads. Some multimeters are designed so that the polarity of their input is reversed in the ohms function; the positive test lead becomes negative and the negative becomes positive.

IN -CIRCUIT TESTS

As stated previously, the very first step in testing semiconductors should be in -circuit voltage checks. When this is not possible, as in the case of power supply short circuits, or when the collector voltage is a high voltage at a high frequency (flyback circuits, etc.), ohmmeter checks should be made first.

In a normally operating circuit, there should be approximately 0.6 volts across the emitter -to -base junction of a silicon transistor and about 0.2 volts if the transistor is a germanium type. If this voltage is incorrect, do not assume that the transistor is defective until you have checked the various supply voltages. Often a voltage regulator or rectifier failure or a short elsewhere on the same supply line drastically alters supply voltages. For this reason, it is a good practice to always check supply voltages first.

Figs. 4, 5 and 6 illustrate the voltage conditions which will be present as a result of various defects in a common -emitter circuit equipped with an NPN transistor. (The same circuit equipped with a PNP transistor would display the same symptoms.) The common -emitter circuit was chosen as an example because it is used more often than the other two basic configurations. Although a few of the defects in Figs. 4, 5 and 6 will cause different voltage symptoms in common -base and common - collector circuits or if different bias and stabilizing networks are used, the causes and symptoms in Figs. 4, 5 and 6 can be "transposed" to these circuit configurations by using the

following general diagnostic guidelines:

If the base -to -emitter junction does not have the correct forward -bias (about .2 volts for germanium and .6 volts for silicon) and there is no evidence of current flow in the collector -to -emitter circuit (lack of voltage drop across resistors in series with the collector -to -emitter circuit and the supply source), check for defects in the base and emitter circuits.

If the base -to -emitter junction is correctly forward biased but there is no evidence of current flow in the collector -emitter circuit, check for an open in the collector circuit.

If the base -to -emitter junction does not have correct forward bias and there is evidence of current flow in the collector -to -emitter circuit, check for a short or leakage in the collector -to -emitter circuit. The preceding guidelines presume

that supply voltages have been checked and are normal.

Some technicians short the base - to -emitter leads and look for a re- duction in the collector current as an indication of a good device. There are some pitfalls in this method, not the least of which is the possibility of destroying the transistor if you short the wrong leads, and the ever present hazard of your hand slipping and shorting to adjacent circuits. For such tests, I prefer to use an insulated mini -clip with extendable hooks which can be clipped right on- to the transistor leads with little danger of shorting, even in tight spots.

Occasionally, you will run across a circuit in which the bias is incorrect but everything else in the set is normal with the transistor removed, and the transistor itself checks normal out of the set. In such cases, look for oscillation. An oscillating IF stage is common when someone has "tweaked" an alignment adjustment. Sometimes, other stages will oscillate at any frequency from audio to UHF if a bypass capacitor in a decoupling circuit opens. Use your scope and low capacitance probe to quickly spot such oscilla- tions.

In many sets, several transistors are DC coupled in "chains." If one transistor is defective or the bias of a stage at the front of the chain is incorrect, the entire chain will display abnormal voltages. In such cases, you can save time by removing the transistors one at a time, for individual testing. If you find a defective one do not stop. Continue testing until you have examined the entire chain. Such circuits often have more than one defective transistor, because one failure triggers more.

Some modern circuits use Dar- lington transistors, which are really two cascaded transistors in one package, as shown in Fig. 7. Be- cause they have three terminals, as any other transistor, it is rather mystifying to find about 1.3 volts between base and emitter. In Fig. 7 you will see that there are two emitter -to -base junctions in series between the base terminal and emitter terminal, which accounts for the base -to -emitter voltage being twice that of the usual bipolar device.

A shorted power transistor in an audio output stage will cause blown fuses. An open device might not be so obvious because one half of a push-pull, transformer -coupled stage will still operate, although the audio will be distorted. OTL (output transformerless) complementary symmetry stages, on the other hand, do not function at all with one transistor defective.

Defective IF or RF stages might not completely eliminate a strong local signal, just as in vacuum tube - equipped circuits. There is enough capacitive feedthrough in a "dead" transistor to produce a degraded, snowy picture or, in the case of AM or FM radios, a weakened or noisy signal.

In resistance -coupled stages, certain defects will cause the base and collector voltages to shift significantly either above or below normal. However, in transformer -coupled RF, IF or AF stages there might not be sufficient load resistance to cause a noticeable DC voltage drop. In such cases, the voltage drop across the emitter resistor can be used as a quick and convenient means for cal- culating the transistor collector -to - emitter current.


Your VTVM is obsolEtE! This may sound like a harsh

claim, but it's true. Thousands of TV technicians are using instruments designed in the 1950's to trouble- shoot circuits designed in the 1970's.

And now, most color TV's have solid state circuits. So use of out-of-date test equipment just compounds the problem.

The generation gap has grown too big.

The Fluke 8000A 32 digit multimeter

Solid state calls for new performance standards.

Your "old fashioned" test equipment simply doesn't measure up to today's requirements. For example, the typical VTVM gives you 5% accuracy and 2% resolution. In the old days, that was good enough. Not so today.

Now you need an instrument to look at the voltages at each pin of an IC with sufficient accuracy and resolution to determine proper IC operation.

For example, a reading of "around 2.8 volts" is no longer sufficient. You must be able to distinguish between 2.80 and 2.82 volts.

You need a test instrument that gives you 0.1 ohm resolution so you can reliably measure resistance of switch contacts, circuit breakers, and low value resistors.

To do all this and more, you need the superior capabilities of the Fluke 8000A 31/2 digit multimeter.

An instrument designed specifically for testing solid state equipment.

The 8000A gives you up to 50 times the accuracy and 20 times the resolution of a VTVM, so you can measure the various voltage levels in a solid state chassis with absolute confidence.

INPUI MA Y-í]

-,

MT i 1

20 MAX 12000 MAX

17181 O

1 COMMON

t

i .' 1 FUNCTION 200MÁ RANGE

O zo 1Á00OMA

ACV AC MA DCV OC MA NO 20Moº 2 20 200 gr,

11111111511111111

POWER

ON-OFI

1, A Et,l 11 1 TA !. M I E T i111 E TE 1

Resolution is 100 microvolts, 100 nanoamps and 100 milliohms

You get the sensitivity you need for low level dc measurements. The 200 millivolt range with 100 microvolt resolution tells you exactly what your values are.

The 8000A has an AC frequency response from 45 Hz to 20 KHz and, with accessory probes, to 500 megahertz. Resistance measuring capability ranges from 100 milliohms to 20 megohms. It offers a 15°C to 35°C accuracy temperature span. And a 1 -year accuracy time span, meaning it seldom needs calibration.

Unlike other DMM's the 8000A has fast response time -3 readings a second. And the bright, digital readout means that no interpolation is necessary.

The 8000A measures high voltages, too.

Our 8000A is designed to answer all the needs of an electronic service technician.

One very important (and talked about!) safety requirement is that the picture tube anode voltage must not exceed the maximum specified by the manufacturer. OuráÔOOA has an optional high voltage probe that gives you guaranteed accuracy of 1% at 25,000 volts. The probe also extends the capability of the 8000A to 40,000 volts to measure the high voltage in the new 32,000 volt chassis.

No other DMM's offer this feature.

High voltage probe accessory gives you 1% accuracy at 25,000 volts

For data out today, dial our toll -free hotline, 800-426-0361

John Fluke Mfg. Co., Inc., P.O. Box 7428, Seattle, WA 98133 ... for more details circle 110 on Reader Service Card

JANUARY 1975, ELECTRONIC TECHNICIAN/DEALER

Get the most up-to-date instrument available.

Don't be caught in the typical trap. Many electronic service shops don't really update their equipment when they decide to update. Switching to a TVM or a FET voltmeter doesn't really give you the accuracy and resolution you need today, or for that matter, tomorrow.

But with the 8000A on hand, you know you have a true solid state testing device ... an instrument that can do the job the way it should be done.

Carry it anywhere. Use it on line or rechargeable battery power. Note the conveniently mounted specs on the bottom decal. They're always with you.

The 8000A comes from Fluke, one of the largest instrument companies in the U.S.

It costs just $299 ($40 more with HV probe).* And it is far and away the largest selling, most rugged and reliable 31/2 digit multimeter in the world. -Domestic only.

FLUKE 21

Profitable and Competitive Pricing of Home Service Calls

By J. W. Phipps

How to use your hourly service labor rate to compute the flat rate you should charge for home calls

Profitable pricing of both in -shop and in -home servicing requires that you determine precisely what it costs you to produce a manhour of service labor. Regardless of the particular method of service labor pricing you use-whether it is flat -rate (by the

job or function), hourly (actual time involved), or some combination of the two-the basis of your pricing structure is the service labor manhour and what it costs you to produce and sell it. This applies to both in -shop and in -home servicing.

TABLE 1

COSTS OF PRODUCING SERVICE LABOR TECHNICIAN WAGES & PAYROLL EXPENSES

Technician Wages Employer Social Security Contribution Employer Unemployment Contribution Employer Life & Medical Insurance Contribution Employer Pension Contribution

$44,720 1,230

895 1,200

474

$48,519 GENERAL AND ADMINISTRATIVE EXPENSES

Secretary/Bookkeeper Wages $ 8,320 Employer Social Security Contribution 229 Employer Unemployment Contribution 166 Employer Life & Medical Insurance Contribution 300 Employer Pension Contribution 100

Building Lease 3,600 Utilities (including heating & air conditioning) 1,500 Telephone 500 Office Equipment Depreciation 100 Office Supplies 600 Advertising Expenses 1,000 Legal/Auditor Fees 400 Insurance (All other than employee) 800 Taxes (all other than Fed. & State income tax withholding) 800 Interest & Bank Charges 800 Misc. (Assoc. dues, subscriptions, license fees, etc.) 300

$19,515 OPERATING EXPENSES

Owner's Salary $18,000 Social Security Contribution 990 Unemployment Contribution 360 Life & Medical Insurance Premiums 400 Pension Premium 300

Vehicle Operating & Maintenance Expenses 1,800 Vehicle Depreciation 2,400 Shop Equipment Depreciation 1,000 Expendable Items, Shop (cleaners, solder, tape, etc.) 400 Service Literature 100

$25,750 TOTAL SERVICE LABOR BUSINESS COSTS $93,784

The procedure for computing the hourly service labor rate you must charge to recover all business expenses and realize a specific margin of profit was outlined last month in an article titled Profitable and Com- petitive Pricing of Service Labor. This procedure involves the following steps:

1) Computation of the total expenses incurred in the operation of your business (Table 1) *

2) Computation of desired profit (Table 2)*

3) Computation of gross service labor income required to recover expenses and produce the desired profit (Table 2) *

4) Computation of the total manhours which will be available for direct billing to customers (Ta- ble 3) *

5) Computation of hourly service labor rate by dividing the required service labor income by the number of manhours available for direct billing to customers (Table 4) *.

The resultant hourly service labor rate should serve as a basis for both in -shop and in -home servicing. The reason for this is that many of the expenses incurred in the operation of your business are "shared" by both in -shop and in -home servicing and cannot be accurately apportioned between the two without the use of a very detailed and complex cost accounting system, which, for most shops, would be so inconve- nient and time consuming that it would be self-defeating. For example, although expenses such as technician wages and payroll expenses, vehicle depreciation and vehicle operating and maintenance usually can be accurately apportioned between in -shop and in -home servicing, others such as building lease, telephone, office equipment and test instrument depreciation usually cannot be accurately apportioned between the two types of servicing. Therefore, unless you already have a proven cost accounting system which permits you to apportion shared expenses with an acceptable degree of accuracy and without consuming too much of your time and that of your technicians, you probably should combine all expenses related to service labor and compute a single service labor hourly rate based on the combined expenses.


APPLYING YOUR HOURLY SERVICE LABOR RATE TO

IN -HOME SERVICING

After you have computed the hourly service labor rate you must charge to recover all business expenses and realize a specific margin of profit, you are ready to compute what you must charge for a home service call.

There are at least three tried -and - proven methods for flat -rate pricing of home service calls:

1) You can charge a flat rate which covers the time it takes you or your technicians to travel to the customer's door plus a specific increment of service time in the home (usually 30 minutes). Time con- sumed in the home in excess of the specified increment allowed by the flat -rate charge is charged the customer on an hourly basis. For example, if the technician spends an hour in the home and your flat -rate home -call charge includes only the first 30 minutes, the additional 30 minutes is charged the customer by multiplying the shop hourly service labor rate by .5 (one half hour).

2) You can flat -rate only the time it takes the technician to travel to the customer's front door and then charge all service labor time in the home on a straight hourly basis.

3) You can flat -rate the technician's travel time and use it as your home -call charge and then charge the customer separate flat rates for each separate function the technicians perform in the home.

You can adopt any one of the preceding methods and make it work for you if the basis of all three methods-your hourly service labor rate-accurately reflects your business costs and the margin of profit you desire.

The only other factor which will significantly affect the profitability of your home -call operation but which is not directly accounted for in your hourly service labor rate is

the travel time between service calls. Profitable and competitive flat -rate pricing of home service calls requires that you be able to predict, with reasonable accuracy, the amount of time typically required for your technicians to travel from one call to the next. (Your hourly service labor rate tells you how much you must charge for this time, but it does not tell you how much

time is involved.) There are two generally accepted methods which you can use to determine how much travel time you should "build into" your flat -rate home -call charge.

The most accurate method is called averaging. During a period of time (the longer, the more accurate), each home -call technician maintains a log on which he records the times he leaves one call and ar- rives at another. At the end of the sampling period, the travel times recorded on the logs are totaled and then divided by the number of calls made. This tells you what the average travel time per call was during the period. You then multiply the average travel time (in increments of an hour) by your hourly service labor rate. For example, assume that the average travel time between service calls for your technicians is 20 minutes (.33 of an hour) and your hourly service labor rate is $20.00.

Your minimum flat -rate for home service call travel then would be .33 x $20, or $6.60. If your home service call rate includes 30 minutes of service time in the home, you add to the $6.60 "travel charge" an amount equal to .5 (one half hour) x your hourly service labor rate, which in this example is .5 x $20, or $10.00. The total of the two produces a home service call charge of $16.60.

The other method of computing travel time is to determine the maximum, or worst -case, time your technicians would spend traveling from the geographical center of the area in which you offer service to the farthest point in the area. You then multiply your hourly service labor rate by this hourly increment of travel time.

The averaging method usually produces a more realistic and more competitive home service call charge

TABLE 2

ANNUAL SERVICE LABOR RECEIPTS REQUIRED FOR DESIRED PROFIT

1) TOTAL SERVICE LABOR COSTS (TABLE 1)

2) DESIRED PROFIT EQUALS 20% GROSS SERVICE LABOR INCOME

3) TOTAL SERVICE LABOR COSTS (TABLE 1) =DESIRED PROFIT, or 4

$93,784 $23,446 4

4) DESIRED PROFIT + TOTAL SERVICE LABOR COSTS - REQUIRED ANNUAL

GROSS SERVICE LABOR INCOME, or $23,446 + $93,784 = $117,230

$93,784

TABLE 3

SERVICE LABOR MANHOURS AVAILABLE FOR DIRECT BILLING TO CUSTOMERS

TOTAL SERVICE LABOR HOURS PER YEAR PER TECHNICIAN 2080 Hrs.

NUMBER OF FULL-TIME TECHNICIANS x 4

TOTAL SERVICE LABOR MANHOURS PER YEAR 8320 Hrs.

MANHOURS DEDUCTED FOR PAID VACATIONS & HOLIDAYS

Vacations (2 wks. per year per technician) 320 Hrs.

Holidays (5 days per year per technician) 160 Hrs.

TOTAL 480 Hrs.

Service Labor Manhours Per Year 8320 Hrs.

Service Labor Manhours Deducted for Vacations & Holidays - 480 Hrs.

TOTAL Manhours Technicians on Job 7840 Hrs.

LABOR Recovery Rate (80%) X .80

TOTAL SALEABLE MANHOURS 6272 Hrs.

TABLE 4

SERVICE LABOR HOURLY RATE REQUIRED

SERVICE LABOR INCOME REQUIRED (TABLE 2) $117,230 $18.70 per Hr. 6272 Hrs.

TOTAL SALEABLE MANHOURS (TABLE 3)


than that produced by the worst - case method. For this reason, most shop owners prefer to use the averaging method for computing the "travel portion" of their home service call charge. The worst -case travel time then is used only as a reference against which to compare the effectiveness of their call routing and dispatching techniques, as described later.

Regardless of which method you use to compute the travel time between home service calls, it will be valid only if you establish a definite geographical area for the travel time study, and apply the resultant flat - rate home call charge only to calls made within that area. Because calls beyond this area will require additional travel time, the charge for such calls should be your flat -rate charge plus an extra charge based on the miles (or increments of a mile) the call is located outside your normal operating area.

PERIODIC EVALUATION OF YOUR HOME CALL RATE

Because a significant portion of your cost of producing a home ser-

vice call is attributable directly to travel time between calls, periodic re-evaluation of average travel time is essential for continued profitability of your home -call servicing. For this reason, it is recommended that you have your home -call technicians maintain a daily travel log on which is recorded the exact time they leave one home and arrive at the next. The log should clearly reveal the travel time between calls, the number of calls, and the time spent in the home. Weekly or monthly as- sessment of the logs will tell you whether or not the average travel time between calls is exceeding the average time on which your home - call charge is based. If it is, you either will have to improve your routing and dispatching techniques to reduce the travel time or you will have to recompute your home -call charge so that it is based on the increased average travel time. As a general rule of thumb, anytime your average travel time between calls exceeds one half your worst -case travel time, you should improve your routing and dispatching techniques to reduce it.

Another method of evaluating the validity of your home -call pricing structure is to: 1) Add up the travel and in -home time recorded on your technicians' travel logs during a specific period, 2) multiply this total time by your hourly service labor rate, and then 3) compare the resultant total with the gross income (minus parts income) you actually received from home call servicing during the period. If the total ar- rived at in step 2 does not equal or exceed the actual "service labor" income received from home -call servicing during the period, either your hourly service labor rate or your home -call rate (or both) is not ade- quate to recover all service -labor expenses and produce the profit you desire. You then should recompute both your hourly service labor rate and your home -call rate.

IN MARCH: Incentive Pay Pro- grams for Your Technicians.

*The specific amounts listed in these tables are intended merely as examples and are not representative of those incurred in any particular business.

RCA's new 3 -inch scope... an entire servicing system for only $229.*

1. It's an 8 MHz general- purpose scope. Typical composite TV video signal.

3.It's a Vectorscope for color TV AFPC alignment. Color bar generator used for test signal.

For fast delivery and full information on the new WO -33B, contact any one of the more than 1,000 RCA Distributors worldwide. Or write: RCA Electronic Instruments Headquarters, Harrison, N.J. 07029. RC,' Specialists demand the best tools of their trade.

.. for more details circle 1


Electronic Instruments

25 on Reader Service Card

2.It's a "Quicktracer" Transistor/ Diode and Component Tester. Typical junction waveform.

4.It's a "ringing" tester for coils, yokes, transformers. Typical ringing test pattern.

5.It includes the WG -400A Direct/ Low -Capacitance Switch Probe and Cable with BNC type connector, and a special "Quicktracer" probe.

'Optional price

FREE from your Winegard distributor:

New IlL loGj1uIftN1Lj(Vt gives you 15 ways to put more ring in your register... more profit in your picture ín'75. Antenna sales slipping? Profits sliding? We can give you some timely, tested, proved effective help. A special Biz Boomer -Upper Kit with 15 sales -getter ideas and the materials you need to put 'em in action.

The kit's yours at no cost from your Winegard distributor. De- signed so that together you can launch a planned program to sell replacements for all those tired old weather-beaten or damaged an-

tennas on homes in your area. In today's competitive cli-

mate, this could be the extra pro- motion power you need to push profits up to-or ahead of last year's. Definitely, an offer you shouldn't refuse.

Not yet in the antenna business? There's plenty of potential going unsold right now. And your Winegard distributor can help you cash in. Why not contact him- today.

WINEGARCI TELEVISION SYSTEMS

3000 Kirkwood, Burlington, Iowa 52601

JANUARY 1975, ELECTRONIC TECHNICIAN/ DEALER 25

New in Color TV for 1975 -Part 5

By Joseph Zauhar

Continuation of a series

which analyzes the new and significantly

changed circuits in 1975

color TV receivers.

This month we will review

RCA's T -Line Series

chassis.

Fig. 1-The two -transistor, "cascode-type" VHF mixer has been replaced with a dual -gate MOSFET mixer. Courtesy of RCA.

Six chassis are employed in RCA's color TV line: The CTC58, 68, 71, and 72 are all -solid-state chassis. Two continued hybrid chassis, the CTC51 and CTC53, manu- factured prior to the transition of RCA to an entirely solid-state line, are used in the 14 -inch and 18 -inch (measured diagonally) screen sizes.

The XL -100 chassis series used in the new line have many common features: modular construction, a MOSFET mixer used in the VHF tuner, negative matrix picture tube and screen temperature setup to 6500° Kelvin, rather than the 9300° K used previously.

CTC68 CHASSIS The CTC68 chassis was first in-

troduced in the RCA S -Line series of color chassis but many refine- ments in its design have been made. The design changes include new, but compatible, audio output and kine driver modules, elimination of the standby filament power con- sumption, an improved tuner, digital channel indication in some models, and a different remote control system in some models.

VHF Tuner The two -transistor, "cascode-

type" mixer that was used previously in the KRK205 tuner, employed in the early S -Line chassis has been replaced by a MOSFET device using a similar circuit configuration. The KRK211 tuner shown in Fig. 1

uses a dual -gate MOSFET mixer

5100 INTERLOCK

L101

50101

r CPR 101

I R101

3M 100

C101

L _ S -LINE CONNECTION

1104 ELIMINATED IN MOST CHASSIS

CO 101 r 7R -117-

R102 C102 3M 100

F101

7A

P/J 105

1103

ri 5102

HI

I 225/160V

J LATE i

T -LINE I

RECTS

30/77V RECTS

TMA LAMPS

NINE

FIL. EARLY T -LINE

Fig. 2-Schematic diagram showing the changes made in the power supply employed in the CTC68 color TV chassis. Courtesy of RCA.

which provides high input impedance, a good noise figure, and low susceptibility to cross -modulation.

Low Voltage Power Supply To conserve energy, the "Instant -

Pic" has been eliminated from all T - Line color TV receivers.

A few early -production chassis will have the standby filament transformer that was used in S -Line chassis, but the wiring has been changed as shown in Fig. 2.

Two slightly different power transformer circuits are used in the CTC68 chassis. In some early production chassis the "Instant -Pic" feature is eliminated by changing the primary lead at the standby filament transformer (T104) to the off side of the line switch and the transformer is energized only when the on/off switch is switched on. In the majori- ty of the chassis, the new design power transformer (T103) is used, providing the 6.3 volt source for the picture tube filament and transformer T104 is eliminated.

If either transformer is replaced in chassis which have both be sure to maintain the correct phasing of the filament winding (following the color coding). If the winding connections of either transformer is reversed, the two filament voltages will be out of phase and the on filament voltage will drop to about four volts,

Fig. 3-The simplified illustration shows how the digits zero through nine

can be formed by illuminating various sections of the seven -

segment display forming channel numbers. Courtesy of RCA.


producing a symptom resembling a low -emission picture tube.

Digital Channel Indication Various T -Line models using the

CTC68 chassis have digital channel indication by using seven -segment, gas -discharge lamps, indicating both VHF and UHF channel numbers. A separate pair of neon lamps are used to indicate VHF or UHF operation.

Digits from zero through nine can be formed by illuminating various sections of the seven -segment display Fig. 3. When a particular cathode of La gas -filled indicator lamp is energized, it glows to make that segment visible and the numeral 8 is formed by energizing all seven segments.

A simple switch is shown in Fig. 4, with contacts connected to illuminate sections B and C of the lamp; the B+ input, which is common to all elements (anode connection), is supplied through a drop- ping resistor to the indicator lamp unit. The cathode elements B and C within the lamp are connected to ground through the switch contacts, energizing them and forming the numeral one.

Proper indication of all VHF and UHF channels requires the use of two indicator lamps encased in the same assembly and are labeled "tens" for the left -side indicator, and "units" for the right -side indicator.

UHF Indicating System

Shown in Fig. 5 is the Units section of a simplified UHF Indicating System which is an equivalent switch circuit, providing UHF channel indication. If a ground is connected to the lamp segments B and C through the isolation diodes B and C, diode CR6202 and switch Sf002 we will get a numeral "1." In this position all other contacts of the switch are in the open position.

The "tens" switch and diode assembly is not shown but it is basically the same as the "units" section. Because of the VHF switching contact sequence, isolation diodes are only required for the B and C segments. The "tens" switch also uses diode CR6202 and switch S4002 to complete its path to ground in the UHF mode. This connection is indicated in the schematic by the

"common" line on the right side of the schematic.

Switch S4002 is located on the VHF tuner shaft and disconnects the common ground connections from the UHF indicator switches for VHF reception. It also operates the two neon lamps for UHF or VHF indication.

The UHF switch assembly consists of two rotating discs, each in contact with an eight -contact wiper assembly (one common and seven switched leads) .

VHF Indicating System

The operation of the VHF channel indicator switch is similar to the "units" section of the UHF switch, and seven of its output leads are

connected to the "units" lamp for number indication of channels 2 through 9. The "common" side of the VHF switch (Fig. 6) connects directly to ground, and has eight switched contacts. The eighth switched lead is connected through isolating diodes to the A and B segments of the "tens" lamp. The addition of this eighth contact to the switch simplifies the system, and eliminates the need for a separate VHF "tens" switch. All contacts are open in the UHF position.

VHF/UHF Mode Indicators The VHF/UHF Mode Indicators

employ a simplified system of indication. The VHF or UHF functions operate in conjunction with switch

Fig. 4-A simplified indicator switch, with contacts connected to illuminate sections B and C of

the lamp. Courtesy of RCA.

+220V

110:

SI

«1+-27+0+07+t9+0 j0+ R

I® C®

E

75R

O

2.2M 110R RI

110:

c ION LAMPI

CONNECTIONS TO VHF SWITCH

225V

.. + . 168K 60k

V CR 6007

UHF

CR 0201 CR 6202

W W

3í6D3 ' TO TENS

SWITCH

ON VHF TUNER

CLOSED IN UHF

Fig. 5-Simplified illustrations showing the Units section of the UHF Indicating System. Courtesy

of RCA.


Fig. 6-Simplified schematic diagram showing the VHF Channel Indicating System. It is similar to the units section of the UHF switch. Courtesy of RCA.

DELETED IN CTC 58LN l 1 OFF

LNC ON

B -Y PHASE SHIFT

+ 11.2V

8

MAE 0018

LUMINANCE VIDEO IN

DRIVE

350

MAD R334

R -Y RED 150

DRIVE 350

G -Y 3

MAG

GREEN

0336 150

0315

GRIVE 330

350

3 8-Y MAD BLUE

4

8338 150

ADDED IN

CTC 58L 'N

DELETED IN

CTC 58VN

B -Y GAIN .`. 10314

150

0315 150

I R316 150

OFF

ON

Fig. 8-Partial schematic of the ACM IV circuit used in other XL -100 color TV chassis, with the CTC58 chassis noted. Courtesy of RCA.

S4002 which is found on the VHF tuner. To indicate VHF or UHF reception a separate pair of neon lamps are used as shown in the simplified schematic diagram Fig. 7. The VHF/UHF Indicator Lamp Switching is shown in the UHF position. Switch S4002 is closed, com- pleting a path from the cathode of diode CR6201 to ground. The circuit is completed to illuminate the UHF indicator lamp through the 68K resistor to B+. The dotted line

connection to ground shows the condition of the VHF lamp when in the UHF position and diode CR6003 is conducting, therefore, both sides of the VHF lamp are grounded.

As the VHF tuner is rotated from the UHF position, switch S4002 opens, and the two diodes switch off, and the ground connection is removed from the high side of the VHF indicator lamp, permit- ting it to illuminate. The UHF lamp is defeated because no ground re-

IN1/10 POSITION

24.

VHF

INDICATOR LAMP

NCR

CA 6003

AIR

E

0 SWITCH SOC/iTOUCHE O ON VHF

TONER -CLOSEDIN UNE POSITION

E3

UNF

INOICATON LAMP

CN 6301

4001

Fig. 7-Simplified schematic diagram showing the separate pair of neon lamps used to indicate VHF or UHF reception. Courtesy of RCA.

turn connection is available to diode CR6201.

CTC58 CHASSIS Two types of the carry-over

CTC58 chassis will continue in the T -Line Series for 1975. The chassis will be employed in 21- or 25 -inch (measured diagonally) console and table model TV sets.

Both chassis versions are electrically identical except for changes in the section of the power transformer circuit supplying the picture tube filament voltage. This change was made because the Instant -Pic feature was eliminated.

Another significant change made in the CTC58 chassis is the removal of the ACM IV switch, but two of the AccuMatic B -Y phase angle change and the B -Y demodulator gain change functions have been re- tained. These functions effectively provide the optimum color demodulator characteristics of the ACM IV system used in other chassis. Shown in Fig. 8 is a partial schematic of the ACM IV circuit used in other XL - 100 color chassis, with the CTC58 chassis changes noted.

In the CTC58L and N chassis, removal of the "A" section of the ACM IV switch effectively turns on the B -Y phase shift circuit on the MAE001B module.

Removal of the "B" section of the switch, in conjunction with the new value of R315, adjusts the kine drive characteristics to yield the reduced B -Y demodulator output-as though the ACM function were turned on.

The tuners used with the CTC58 chassis will include the KRK199 VHF and KRK207 UHF units.


CTC71 CHASSIS

The CTC71 chassis is continued in the T -Line for 1975. This chassis will be used in several non -remote table models featuring a 19 -

inch (measured diagonally) screen. The PW300 signal circuit board

uses the same module complement as that of other current XL -100 chassis. The MAC002A Chroma -1

module has been superseded by the new MAC002B module, employing an advanced phase -locked -loop IC for the 3.58 MHz subcarrier regen- eration. It is a direct replacement for the earlier "A" version. This module is common to all 1975 XL - 100 chassis.

The horizontal -deflection system uses the transistorized sweep circuits first introduced in the CTC60 chassis. This chassis develops 27 kv of high voltage through a silicon tripler, the horizontal -deflection system is powered from a regulated 125 -

volt source and overload protected by an integral current -limiter circuit.

In comparison to its predecessor CTC60, most of the hold-down circuitry is contained on the MAH004 horizontal -oscillator module, rather than on the PW400 deflection board.

The vertical deflection system in the CTC71 uses the familiar MAG001 module and chassis - mounted vertical output transistors.

The tuners used in this is

MOSFET mixer KRK199 VHF tuner and the digital -indicator KRK - 207, 70-detent UHF tuner. Accu- Matic IV, AFT, and extended life neon pilot lamps are used in color TV sets employing the CTC71 chassis.

CTC72 CHASSIS

Three different versions of the CTC72 introduced in March and June will be used with portable and table model color TV receivers. The three types include the CTC72B which is used in non -remote 15 -inch (measured diagonally) TV sets, and

Let us send you 33 proven ways to conserve energy in your business We would like to tell you how Energy Management can help maintain your company's profitability. Send for your "33 Ways" booklet and we will send you something else: "How to Start an Energy Management Program."

To: U.S. Department of Commerce Office of Energy Programs Washington, D.C. 20230

Please send me your two free booklets on "33 Ways to Conserve Energy" and "How to Start An Energy Management Program."

Name

Title

Company

Address

City State-ZIP- L Type of Business

the CTC72N for non -remote 17 -

inch (diagonal) screen size TV sets. All TV models introduced in

March featured a negative -matrix precision in -line (AccuLine) color picture tube, digital UHF tuning, and AFT.

In June, a remote -control 17 -inch (measured diagonally) TV set, Model ET396R, was introduced. This chassis includes all of the above features plus remote control functions for channel and volume change and on/off.

The remote control used in the CTC72R chassis is the familiar two - function type, which remotely controls a 20-detent channel -selection system used previously, and a volume -stepper circuit which allows

three preset volume steps and "off." The CTC72 chassis is electrically

similar to the CTC62 that it re- places, only the Instant -Pic feature has been eliminated, requiring a few

minor changes in the power switching circuit.

Patent 3,778,713

The Wayne Model WT2A

makes YOU money saves much time . makes troubleshooting easier A new concept in transistor testing

based on proven methods of circuit analysis. A current limited AC volt-

age is applied to each semiconductor junction under test. The resulting DC

voltage is monitored while the rec-

tifying junction is passing normal rated current. Abnormalities are

easily identified.

Indicates PNP or NPN

Measures relative gain

Test leads applied without prior basing knowledge

Locates base and collector during test

Indicates silicon or germanium

Indicates transistor non -linearity

In -circuit tests with shunt impedance down to THREE ohms

Performs all of above and more in less than ten seconds

ELECTRONICS 5412 Nordling St./Houston, Texas 77022



Digital Frequency Counters for Servicing -Part 1

By Joseph J. Carr, CET, ET/D Contributing Editor

Operation, specifications and applications

Until recently, digital frequency and period counters have been high - cost, exotic instruments associated with "high - dollar" communications shops, government fi- nanced R & D laboratories

and test equipment/me- trology facilities.

Modern electronic technology has changed all of that, allowing manufacturers to offer, at substantially lower cost to the user, quality digital counters

whose performance often exceeds that of all but the best previous designs. As an example of this trend, consider those highly accurate, FCC -type -accepted counters often seen in mobile radio repair shops.


OCU 5

DCU 4

DCU DCU DCU

O RESET

Fig. 1-A decimal counting assembly (DCA) consists of several decima

counting units (DCU's) in cascade. Each DCU counts from 0 to 9 and

controls one digit of the multi -digit display.

REAL-TIME STROBED MEMORY

BCD OUTPUTS BCD OUTPUTS

DECADE

COUNTER

SN7490

STROBE

"CARRY" (TO NEXT DCU INPUT)

LATCH

SN7475

READOUT DEVICE (NIXIE®, FLOURESCENT,

LED, ETC)

Fig. 2-Simplified block diagram of a low-cost TTL decimal counting

unit capable of counting to over 20 MHz. The latch circuit keeps the

display stable.

Fig. 3-Block diagram of a typical frequency counter.

TO DECIMAL COUNTER ASSEMBLY

AMPLIFIER &

TRIGGER

Fig. 4-Block diagram of period counting functions. Period counters

measure the time interval between the beginning of successive pulses

by reversing the function of the input amplifiers and the time base viz

a viz the control flip-flop.

Just a few years ago, such instruments carried price tags of between $1800 and $4000. Today, at least one instrument in that class can be purchased for less than $800. Some non -type -approved digital counters sell for less than $100, while a few still carry prices in the multi -kilo - buck range. The cost of digital counters has de- creased to the point that some top -dollar signal generators are equipped with a built-in frequency counter which functions as the dial read-out.

In this two-part series, the internal circuitry of digital counters will be examined and their utility of application around almost any electronic service shop will be demonstrated. We also will give you some in- sight into digital counter terminology and specifications, so that you can make intelligent purchase decisions which avoid the pitfalls of "creative spec" writing.

DECIMAL COUNTING UNITS

The real heart of the digital counter is a digital electronic circuit which ac- cumulates pulses and drives a readout device which tells the outside world how many pulses (from 0-9) have been counted. Such circuits, called decimal counting units (DCU's), can be cascaded to provide a wid- er counting range (i.e., 0- 99, 0-999, etc.) . A bank of several DCU's in cascade, as shown in Fig. 1,

is called a decimal counting assembly (DCA). One DCU is required for each digit in the DCA.

One of the factors which pushed up the price of counters in previous years was that the DCU was made of (then) very

expensive digital -logic integrated circuits. A typical digital counter IC then cost more than $15.00. Or they were equipped with transistorized flip-flops, which were equally expensive. When the transistor design was used, four flip- flops were needed per digit. And the transistor type of DCU often proved difficult to decode, making it even more costly to use. All DCU's, incidentally, require decoding because the counters operate in binary coded decimal (BCD) . In that number system, four "bits" (voltage levels) are presented, each on separate lines, to represent the decimal digits between 0 and 9 (i.e., 2 = 0100, 6 = 0110, 9 = 1001; where binary 0 is

either "ground" or some negative voltage, and binary 1 is either a positive voltage or a negative voltage, depending upon the system).

Fig. 2 shows the partial schematic of a relatively common DCU using transistor -transistor digital logic (TTL) integrated circuits. At one time, these devices cost an arm and a leg, but they now are relatively cheap. The SN7490P decade counter, for example, can be purchased for $1.00 to $4.00, depending upon the source.

The type of decade counter used in Fig. 2 can count to speeds somewhat in excess of 20 MHz, while certain high-speed TTL chips count to 50 or even 80 MHz. The internal circuitry of the SN7490 includes all of the flip-flops and gating needed to form a decimal counter.

In many counters, especially in older designs or a few newer but very low- cost types, the decade


counter directly feeds the binary coded decimal (BCD) lines to the decoder circuit. This design produces a rolling display that is a little hard to read. You can actually see the digital readout of these instruments change as pulses are accumulated much in the same manner as the digits on a gasoline pump "roll" as price is accumulated.

To keep the display steady, most modern counters, even those of modest cost, use a four -bit memory, called a quad latch, between the counter and decoder circuits. A latch circuit "remembers" the BCD state which existed at its input the last time the strobe terminal was enabled (turned on). This design allows the display to be "instantly" updated at a rate determined by the repetition rate of the display multivibrator, which is set by a control on the front panel. In some low-cost designs, the display is still fed by a latch, but the display rate is fixed. You can tell whether or not a counter is equipped with a latch. If it is, the display update will occur all at once; the new digits seem to pop "pre -counted" onto the readout. Non -latched types will exhibit the "roll" symptom.

FREQUENCY COUNTER DESIGN

Fig. 3 is the block diagram of a typical digital frequency counter. Al- though this particular design is not found in all digital frequency counters, it is sufficiently representative to be used for explan- atory purposes. The differ- ences between the design in Fig. 3 and other designs usually involves special

features in special-purpose counters (i.e., high -resolution types) or, in low-cost types, deletion and/or automation of some of the features in Fig. 3.

In counter jargon, the term "frequency" is called events per unit of time (EPUT). Remember, before they changed the jargon, frequency was "cycles (events) per second (unit of time)." Any EPUT counter requires a main gate, which allows pulses being counted into the DCA. The gate is opened and closed by a train of pulses from a time base circuit. These pulses also are used to reset the DCA to zero state, so that a true count is obtained. Without a main gate, the DCA would simply continue to accumulate input pulses with no relationship to time.

PERIOD COUNTER DESIGN

A period counter (Fig. 4) is used to measure the amount of time between successive pulses. This can be accomplished by merely reversing the functions of the input amplifier and the time base. The main gate flip-flop will be enabled by a pulse from the input amplifier, and closed by the next pulse. Time base pulses are passed through the gate to the DCA. If a 1000 -Hz time base signal is used, the period is measured in mil- liseconds. Many counters allow selection of the time base frequency.

There are many uses for a period counter, but the two main applications are in measuring low -frequency signals (less than 100 Hz) or higher frequencies where much greater resolution than 1 Hz is required. An example of the latter use is in electronic

SIGNAL AMPLITUDE CROSSES BOTH THRESHOLDS OF THE HYSTERESIS WINDOW SO A "COUNT" OCCURS

SIGNAL ONLY CROSSES ONE THRESHOLD SO NO "COUNT" OCCURS

Fig. 5-A "count" can be achieved both the upper and lower bounds of

musical instruments, in which certain of the tones are specified to within three decimal points of one hertz. In such cases, you simply choose a time base frequency high enough to give the desired resolution, and then perform this arithmetic:

Freq. (Hz) = 1

Period (sec)

Period (sec) = 1

Freq. (Hz)

, or

TIME BASE CIRCUITS

The length of time that the gate stays open is a function of the time base frequency. A time base is a precise crystal -controlled oscillator followed by some TTL decade dividers (the same SN7490P IC used in the DCU, but without decoding). Typically, 1 -MHz oscillators are used, but 3-, 4-, 5- and 10 -MHz types are occa-

only when the input signal crosses the trigger's hysteresis window.

sionally used. Some counters provide

a switch which allows the user to select time base in- tervals between .0000001 (.1 microsec) and 10 seconds. This is done by selecting frequency through choice of division ratio. (Each SN7490P will provide an output frequency 1/10 of the input.) Typi- cally, 10 MHz gives gate times of .1 microsecond, 1 MHz yields 1 microsecond, 1 Hz gives 1 second, etc. Many of the lower - cost counters provide limited manipulation of the time base through a "Hz/ KHz" or "KHz/MHz" switch.

One of the principal counter specs is time base stability and accuracy. Al- though the inclination may be to buy a counter with top time base specs, this can needlessly overprice your instrument. Where exceptional accuracy is not needed, a non -compensated, room -temperature

32 j ELECTRONIC TECHNICIAN/DEALER, JANUARY 1975

ET O

ET +

ET

TRIGGER CONTROL

RANGE

TRIG.

NORMAL OR

PRESET

TRIG.

POSITIVE PULSES

--n

SINE WAVE -- WITH HIGH DC COMPONENT

SINE WAVE WITH LOW DC COMPONENT

NEGATIVE PULSES

NO COUNT

COUNT NO COUNT

NO COUNT

Fig. 6-Trigger controls vary the position of the hysteresis window up

and down on a voltage scale so that signals of either polarity, with or Fig. 7-Several of the waveforms which cannot be counted by a digital

without a DC component, can be counted. counter with a fixed hysteresis window.

time base usually will suf- fice. These circuits can offer stability figures on the order of 5 x 10-8. A step better, offering five times the stability, are temperature -compensated crystal oscillator (TCXO) designs. In some cases, TC- XO counters are accurate and stable enough to receive FCC type approval.

Oven -controlled oscillators offer the best stability. Simple thermostat -controlled oscillator ovens offer better stability but are still somewhat inferior to those using proportional control ovens. This design produces a more constant temperature. A single - oven proportional control oscillator can keep the frequency within ± 5 x 10-8. The most stable and accurate counters use double oven oscillators, which have the actual crystal oven inside a second oven. Such arrangements are capable of maintaining crystal temperature within

.01° C, producing a frequency stability of 5 x 10-11. Of course, expect double -oven time base oscillators only in the most expensive counters.

TIME BASE AGING

Crystal oscillators, even high-grade types, always drift over a period of time. This slow drift is usually predictable and is ex- pressed as an aging rate. This is the reason for periodic trips to the calibration laboratory or manufacturer, if it is desired to keep the instrument up to its original specs. How often calibration is needed is a function of the aging rate.

Keep in mind that even the best counters with really good stability figures have an aging rate. Also, their normal stability cannot be expected until the instrument has been on for at least 24 continuous hours. Because of this,

many counters use a special power supply for the time base oscillator. This accomplishes two things: 1) The power supply reg- ulation is improved because the loading is essen- tially constant, and 2) the oscillator supply can be left on even when the counter is turned off. If you cannot keep your instrument plugged in (so that the oscillator will run continuously), it may be necessary to buy one with at least one order of mag- nitude better stability than would otherwise be needed. Some battery types are good in this respect because they can be left with the oscillator on during unplugged periods (i.e., in your service truck between jobs). The standard of accuracy for a counter is not less than five times the accuracy required of the frequency under examination. For example, a Citizens -Band transmitter must be within

±50 ppm (5x10-5); consequently, a counter for CB servicing should have an accuracy not worse than 10 ppm, with 5 ppm being best.

TRIGGER CIRCUITS

Most counters are equipped with Schmitt trigger circuits which have both upper and lower threshold bounds (see Fig. 5) . An input signal must cross both threshold levels if the DCA count is to be affected. The difference between these limits is

called the hysteresis window. Its function is to allow only one pulse to be generated for each input cycle. Otherwise, it would be possible for non -sinu- soidal waveforms to falsely trigger the DCA. The trigger control varies the position of the window relative to a minus -zero - plus voltage scale, so that a variety of input signals not centered about zero can be counted. Other -


wise, a signal with a DC component might not be counted even though its own relative amplitude is greater than the advertised sensitivity of the counter. Fig. 6 shows the action of the trigger control. Fig. 7 shows several types of waveforms which cannot be counted on an instrument with a fixed hysteresis window.

Some counters do not have a continuously variable trigger control but, instead, are equipped with a three -position switch typically labeled either "+, 0, -" or "+, present." In many applications, this arrangement is less desirable than a continuous control, but is better than no control at all. A trigger control is almost a necessity for TV applications because the pulses encountered may have either polarity, with or without a DC component. The rarely seen trigger amplitude control does not affect the "center" position of the window, but does vary its "width."

COUNTER SENSITIVITY

One parameter which, like hi-fi power output, has been subjected to a lot of "creative" spec writing is sensitivity. On the surface, it might appear that the more sensitivity, the better. However, this is not always true. Sensitivity is the minimum amplitude of signal which can reliably trigger the counter. If the sensitivity is too great, noise might falsely trigger the instrument; if the sensitivity is too low, desired signals might be ignored.

Sensitivity is often ex- pressed in either RMS volts or in a certain pulse amplitude (also volts) . In any event, most trigger circuits have a pulse sensitivity that is 2.82 times the

RMS figure. If both figures are specified, be a little wary of the instrument which has a ratio significantly different than this value, because there might be something wrong with the sensitivity at higher frequencies.

It is difficult to state a specific optimum counter sensitivity. All that is possible are some general sensitivity guidelines, which are dependent on input impedance. Sensitivity values which usually are acceptable are 25-100 milli- volts RMS for 1-megohm inputs, and 10-50 milli- volts RMS for 50 -ohm inputs. Generally, counters under 200 MHz have high -impedance inputs, and those over 200 MHz have a 50 -ohm input.

VHF COUNTING TECHNIQUES

Common TTL digital IC's are capable of counting up to about 80 MHz. IC's in the ECL family are capable of being operated at twice this frequency, but are neither as cheap nor are they directly compatible with TTL. Very special (and expensive) ECL types can count in excess of 500 MHz. Be-

yond these limits, or even up to them if cost is a factor, other techniques must be applied. There are at least three methods for achieving a high -VHF/ UHF counter: direct counting, prescaled counting, and heterodyne counting.

Direct counting is the normal mode of operation for digital frequency counters. Most common counters can direct count to around 80 MHz. If an ECL first stage is used, this "normal" limit is pushed to 180 MHz. Keep in mind that direct counting (also called real time counting) is possible to over 500 MHz if one wish- es to pay a premium price.

A prescaled counter divides the input frequency by some integer, then counts the resulting frequency. If the selected division ratio is ten, to "read" the actual frequency you merely remember to move the decimal point on the readout one place. One reason for using this technique is that several lower -cost IC's will divide by ten up to 500 MHz, but not in a circuit that is easy to decode for display purposes. Fig. 8 shows a pop-

VHF/UHF PREAMPLIFIER

456.156 MHZ INPUT

TEN

80 MHZ COUNTER

45.615600 MHZ I

Fig. 8-Prescaling is a technique which makes it possible to measure frequencies in the VHF and UHF ranges with an instrument designed for a lower range of frequencies.

Fig. 9-Heterodyning is another method of extending the frequency range of a digital counter.

ular prescaled system. The third method men-

tioned is the heterodyne system, shown in Fig. 9. In this type of counter, the input frequency is trans- lated to a lower frequency within the range of the instrument. The "local" frequency source can be a separate crystal oscillator, but usually is a frequency multiplier chain or phase - locked -loop (PLL) controlled oscillator, either of which can be driven or synched by the time base oscillator.

If the "local" frequency source in a heterodyne counter is designed to produce frequencies as high as 400 MHz, and the basic counter is capable of direct counting to 80 MHz, the counter will be capable of measuring frequencies in the mobile radio bands up to 480 MHz because it will actually be measuring Fi. -Fine.,. Counters well into the microwave (GHz) range are possible by use of this technique.

COUNTER ERROR

All of those pretty digits displayed by a counter might tempt one to make the same error made by high school physics students working problems with a sixteen -digit calculator: forgetting that only a portion of the total display is valid. For all counters in which the main gate circuitry does not synchro- nize the time base with the input signal (which is just about all counters), the display accuracy is ± the last (least significant) digit. This makes the overall accuracy equal to the time base error ± one count of the LSD. NEXT MONTH: Specific applications of digital counters in the service shop, and what specs are desirable for each.


TECH BOOK DIGEST

Condensed from a single chapter of a recently introduced TAB book, by permission of TAB BOOKS, Blue Ridge Summit, Pa. 17214

Troubleshooting Horizontal Deflection & High Voltage Circuits -Part I

THE DEFLECTION CIRCUITS

The deflection circuits are com- prised of four major stages: the horizontal output stage, the horizontal output transformer, the deflection yoke, and the damper. All four of these work together to control the horizontal deflection of the electron beam.

A simplified schematic of a typical horizontal deflection system is shown in Fig. 1. The output of the horizontal oscillator drives the grid of the horizontal output tube, which is class C biased by the grid circuit. Plate voltage for the output stage is provided by the charge across Cl. How this charge is developed is easier understood after looking at the operation of the four stages.

With no signal applied to the grid, V1 is cut off, and no current flows in the transformer or yoke. No magnetic field will be developed without yoke current; therefore, the beam is at the center of the screen. As the output stage is brought into conduction, current flows through V1, through the transformer, through the yoke to the positive B -boost charge on Cl, from the capacitor to the B+ supply, and through the supply to ground. The corresponding CRT trace is shown as vector A in Fig. 1B. As the current through V1 and the yoke increases (shown as A in Fig. 1C), the beam is drawn farther to the right.

When the waveform at the grid of V1 starts going negative, V1 is suddenly cut off. This sudden stop- ping of V1 current causes the magnetic field about the transformer to collapse, inducing a current in the yoke in the same direction as that supplied by V1. However, instead of flowing into Cl, the current charges the yoke capacitors. Tube V2 cannot conduct, due to the high positive potential on the cathode. When the yoke field is fully dissipated, there is no more yoke current; therefore, the beam returns rapidly to the center of the screen.

/VV oaE mC

o aa aNE.

Ep

E

N,

p

<°;oFF

OF SCREEN p

e

...,,voKE CURRENT f aNEN, ,Nao,.

"ZZIVDo,

.,

C .oNE <N>E

Fig. 1-Horizontal deflection circuit.

Fig. 2-Horizontal deflection circuit, showing

inearity control.

As the ringing action of the yoke continues, the charge across the yoke capacitors starts to discharge through the yoke coils. This causes a reverse yoke current, and the beam is deflected to the left of the CRT, as shown by vector C in Fig. 1B. During this cycle, the cathode of

From Chapter 11, LOGICAL COLOR TV TROUBLESHOOTING, by Ben Gaddis, TAB BOOKS, Copyright 1974. A review of the complete book follows part 2 of this article.

the damper is gradually becoming less positive; and when the coils of the yoke begin to discharge into the capacitors once again, the cathode is negative with respect to the plate.

As the coils discharge back into the capacitors, yoke current flows once again, moving the beam to the center of the tube. As this current increases, V2 conduction continues to increase, gradually dampening the ringing action of the yoke (shown by dotted lines in Fig. 1A) . When the beam approaches the center of the tube, the waveform at the grid of V1 is sufficiently positive to cause V1 to conduct, and the cycle starts over again.

The plate supply for V1 is the B -boost voltage across Cl. Each time V2 conducts, its plate voltage drops. This AC voltage at the plate óf V1 causes a charging current to flow into C 1. The plate circuit sees C1 in series with the B+ supply and, therefore, the voltages are additive, resulting in a high DC voltage at the junction of Cl and the yoke. Each time V1 conducts, the charge across Cl is reduced, to be replaced each time V2 conducts.

A more complete schematic of the horizontal deflection circuits is

shown in Fig. 2. Bias for V 1 is developed across Rl, holding V 1 in cutoff until the oscillator output is

sufficiently positive to cause conduction. Operation of the damper and yoke stages is the same as described earlier. Coil L1 is provided in some sets as a horizontal width control. Coil L2 is a linearity control. This control tunes the horizontal output circuit to provide minimum loading of the output stage. It is more correctly called horizontal efficiency, because it has very little control over linearity.

An example of a solid-state horizontal deflection system is shown in Fig. 3. The operation is generally the same as that of the tube -type circuits, with exception of considera- tions necessary for solid-state circuits. The deflection yoke coils have

JANUARY 1975, ELECTRONIC TECHNICIAN/DEALER ! 35

Fig. 3 --Solid-state horizontal circuit.

been placed in parallel in this example to reduce to total inductive load on the output transistor. In some models, a buffer or driver transformer is located between the oscillator and the output stage to prevent loading of the oscillator. To provide the relatively high power output required of this stage, two transistors operating in parallel are sometimes used. Conduction of the output transistor causes beam deflection from the center of the screen to the right, and damper current moves the beam from the left to the center, just as in the previous circuits.

There are usually several other output taps on the flyback transformer in addition to those already presented here. The high -voltage circuit takes power from some of these taps, while others are used for horizontal blanking, AGC, AFC, and color -gating signals.

THE HIGH VOLTAGE CIRCUITS

For the purposes of our discussion here, the high -voltage circuits include two separate high -voltage supplies: the second -anode supply, and the focus supply. Some sets use one common high voltage supply with a voltage divider to produce the two DC voltages, while others make use of a high B -boost voltage as the source of focusing voltage. Two separate supplies are shown in Fig. 4.

Separate windings on the flyback transformer supply filament voltage for the two rectifiers. These circuits function similar to a conventional half -wave rectifier power supply. When oscillator action causes V1 to cut off, the collapsing magnetic field in the flyback transformer induces a voltage in the transformer winding that produces a high DC voltage pulse at the plates of the rectifiers. This pulse is stepped up by the auto - transformer action of the flyback. Rectification is achieved by the rectifiers, and a high DC voltage is produced at the cathodes. By means of L1, the impedance in the cathode

36 ELECTRONIC TECHNICIAN/DEALER, JANUARY

oa OUT

TOCGI

Fig. 4-High voltage supplies.

circuit of V4 can be adjusted to set the focus voltage at the prescribed level. Adjustment of the second - anode supply is usually made in the high -voltage regulator circuit, which will be discussed later.

Solid-state high -voltage diodes generally employ high -voltage solid- state rectifiers that function similar to their vacuum tube counterparts. One type of solid-state supply, shown in Fig. 5, uses a voltage tripler circuit. In this example, a high - voltage pulse is generated in the transformer and appears at the anode of X1. As X1 conducts, a charge is developed across the parallel capacitor. After several cycles, all capacitors are charged and the charges appear in series, adding to the total DC voltage available at the second anode.

In a television set, the high - voltage output of the second -anode supply will vary with the brightness of the scene. This is due to the fact that during the reproduction of high brightness areas the CRT is drawing a relatively heavy current, placing a load on the high -voltage supply. As scene brightness decreases, the load on the supply decreases, and, as a result, the high -voltage output increases. Due to the lower amount of beam current drawn by b -w receivers, this fluctuation can be tolerated. However, the heavier beam currents of the color CRT causes these variations in the high voltage to be excessive, and cause a decrease in picture width due to the loading placed on the horizontal output stage. Qther circuits in the color receiver also draw DC or signal voltages from the horizontal output;

1975

>I

OUTPUT I -

IH --

Fig. 5-Solid-state high -voltage supply.

therefore, loading of the output stage cannot be tolerated in the color set. To overcome the loading effect on the horizontal output stage, color receivers employ a regulated high -voltage supply. Basically, this supply is the same as the one just discussed except for a regulator stage placed somewhere in the high - voltage generating chain.

Regulator Stage

The shunt -type regulator has long been the most popular of the high - voltage regulators. A simplified version of this circuit is shown in Fig. 6A. Operation of this circuit is based on the premise that the output stage and flyback transformer function as a constant -current source; that is, a steady value of DC current is drawn from the transformer. The regulator tube in parallel with the load (the CRT) controls the amount of current shunted around the load, thereby regulating the voltage across the load.

In the figure, a high -voltage triode is tied between the high -voltage supply and B+. The grid is connected to the B -boost source through a voltage divider, one resistor being adjustable to furnish a high -voltage adjustment. The function of the triode is to furnish a variable load across the high -voltage output, in parallel with the CRT. As the load of the CRT decreases, the load furnished by the regulator tube increases and, as the CRT load increases, the load furnished by the regulator decreases. Thus, a constant load is reflected to the power supply.

Assume that the scene brightness suddenly increases, causing beam current to increase. This causes a heavier load to be placed on the flyback, and the voltage output starts to decrease. The heavier load will also cause a decrease in the boost voltage. As boost voltage decreases,

Fig. 6-Shunt-type high -voltage regulators. A)

Without hoiddown provision. B) With holddown

provision.

the bias on the regulator tube is increased (made less positive), causing the tube conduction to decrease. Conduction of the regulator tube decreases until a point is reached where the high voltage is returned to normal. Boost voltage will again be at its normal level.

If the scene brightness should decrease, the high voltage will attempt to increase due to the decrease in beam current. The decrease in load also causes an increase in boost voltage. This positive -going voltage causes the regulator tube to increase conduction, restoring the normal load on the transformer, and the high voltage and boosted B+ return to normal.

It must be remembered that this type of regulator circuit is designed to function within certain specified limits. Should the current in the load vary to a point outside these limits, as would be caused by opens in the load or a low resistance to ground, the regulator tube will not be able to control the high voltage. In cases of excessive high voltage, as could be caused by a failure of the regulator tube itself, there is the danger of X-radiation. Therefore, some modern shunt regulators use the modi- fied circuit shown in Fig. 6.

Improved Regulator Circuit

In this example, a diode is placed between the B+ supply of the regulator and the cathode of the regula -

Fig. 7-A pulse -type high voltage regulator.

tor tube. The B+ for the output stage is also drawn from this same diode. In this circuit B+ will be available to bias the output tube in-

to conduction only if the regulator tube is conducting. If the regulator fails, no current flows through the diode, and the bias on the grid of

the output tube is lowered due to the absence of the B+ voltage. There will still be a high -voltage output, but it will be below normal.

One disadvantage of this circuit is that if the high -voltage regulator tube shorts-a common occurrence -the diode will probably short also. When the regulator tube is replaced to restore normal operation, all will appear well, even though the diode is shorted. However, the safety feature will now be inopera- tive because B+ will be available to the output stage at all times, regardless of the conduction of the regulator. When regulator tubes are replaced in this type of circuit, always check the diode for shorts.

Another disadvantage of this type of regulator is the amount of power wasted. Since operation of the shunt regulator is based on the fact that the flyback must supply a constant current, power dissipated by the regulator tube during periods of low brightness is wasted. This results in the transformer supplying a full load current at all times.

A better method would be one in which the transformer supplied only the amount of current required in any one instance. Such a circuit is

shown in simplified form in Fig. 7. This circuit is called a pulse regulator, due to the fact that it functions on pulses from the flyback transformer. Control grid, screen grid, and plate voltages for the regulator tube are all received in the form of

Fig. 8-Diode feedback high -voltage regulator.

positive pulses during the retrace time. If the brightness of the scene decreases, the high voltage attempts to increase. At the same time, the amplitude of the pulses at the various transformer taps also tries to increase. This increase in the positive pulses applied to the pulse regulator tube causes the tube conduction to increase and load the transformer, decreasing the transformer efficiency and current. If the high voltage decreases, so do the pulses to the regulator. The regulator conducts less, causing less loading of the flyback and an increase in efficiency. As in the shunt regulator, a protection diode is included in the cathode circuit.

Feedback Regulator

An even more efficient method of regulating the high voltage would be to regulate the current available to the transformer. Regulators using this principle employ a feedback system similar to automatic gain control. An example of the feedback regulator is shown in Fig. 8. This circuit is sometimes called a grid regulator, but its use with solid-state circuits as well as tube circuits makes the name feedback regulator more appropriate.

Normal operating bias for the tube is supplied by a grid leak circuit and the voltage divider between B+ and ground. As the high voltage tends to increase, the amplitude of the pulse applied across the diode also tends to increase. This pulse is

rectified by the diode, and the filter action of C2 causes a charge to be developed across C2. With an in- creasing pulse, the negative voltage applied to grid resistor R1 increases, causing the tube to decrease conduction, and, consequently, the high voltage is lowered.

Continued next month in Part 2


ET/D 1974 SUBJECT REFERENCE INDEX The first numerical group following each listing indicates the month of the issue in which it appeared, and the second numerical group indicates the page on which coverage of the topic appears or begins. The two -letter alphabetical code in parenthesis im- mediately following some listings indicates coverage in one of the following ET/ D regular departments: COLOR -

FAX (CF), Dealer Showcase (DS),

New Products (NP), TEKLAB (TL),

Technical Digest (TD), Test Instrument Report (TR)

ANTENNAS (Including Systems & Accessories Antenna, Jerrold Electronics Corp., Model TOTE -5K (DS) 2/53 Antenna, JFD Electronics Corp., Model LPV-UC (NP) 6/50 Antenna Matching Harness, Jerrold Model USL -U (NP) 4/64 Antenna System Directional Coupler Taps, Jerrold Electronics,

DFT/Series (NP) 12/45 Antenna, The Finney Co. (NP) 1/49 Antennas, Antenna Specialists Co., Models ASP -816/817 (NP) 10/48 Antennas, Channel Master Quantum Series (NP) 12/48 Attenuation or Loss 4/33 Balancing Channels in MATV Systems 10/32 CATV Drop Cable, Belden Corp. (NP) 8/44 CATV Midband Trap, Blonder -Tongue Model MWT-4 (NP) 3/20 Coax or Twin Lead -Making the Choice 4/32 Coax Types 4/35 Distribution Amplifier, Antennacraft Model UVF-1520 7/49 Distribution Amplifier, Jerrold Model CDA-300 (NP) 3/46 Distribution Amplifier, Winegard Co., Model DA -215 (NP) 8/43 Distribution Amplifier, Winegard Co., Model DA -8258 (NP) 1/50 Fault Finding In MATV Systems 4/36 Fields Interference and Durability 4/32 FM Antenna, Blonder -Tongue Stereo -Eight (NP) 8/45 FM Interference Trap, Jerrold Electronics Model RFT -300 (NP) 7/49 Home Antenna/Cable TV Switch, ACA Model CM10 (NP) 11/45 Impedance 4/32 Interpreting MAW Amplifier Specs 9/38 Matching Transformer, Jerrold Model T-3789 (NP) 5/50 MATV CATV Attenuator, RCA Model WM -542A (NP) 8/43 MATV Distribution Amplifier, ACA "Mini -Mite" (NP) 10/48 MATV Head Ends, Jerrold Electronics (NP) 8/46 MATV Tapoff, Blonder -Tongue Model V-4897 (DS) 9/52 MATV Taps-Selection and Use 7/22 Mobile Antenna, Antenna Specialists Co., Model ASP -800 (NP) 9/50 Mobile CB Antenna, The Antenna Specialists Co., Super Scan II (NP) 6/51 Selling TV Antennas to CATV Subscribers 4/50 Three -Way Splitter, AEL Communications Model MSB3 (NP) 4/65 Travel Antenna, ACA Model AC800K (DS) 5/57 TV Interference-Causes and Cures 3/27 Twin Lead Types 4/35 Two -Way VHF/UHF Splitter, RMS Electronics Model HS-20U/MM ..(NP) 3/46 UHF Antenna, Antenna Specialists Co., Models ASP -820/821/822 ...(DS) 9/55 UHF Bandpass Filters, Jerrold Model UBPF-14 thru UBPF-70 (NP) 1/49 UHF Preamplifiers, Blonder -Tongue Model SCMA-U (NP) 6/52 UHF/VHF/FM Antenna, RCA Model 4BG48 (NP) 11/44 VHF Cable Loss Equalizer, Q -Bit Corp., Model 4200 (DS) 9/58 VHF/FM Antenna Preamplifier, Winegard Co., Model RD -375 (NP) 2/48

AUDIO

Audio Adapters, Switchcraft 301Q "A -G" (NP) 8/42

38 1 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1975

Audio/Video Tape Logger, GYYR Products, Odetics, Inc. Model TL350 (DS) 1/54

Car Stereo, Aiko America Corp., Model ACS -217 (DS) 1/54 Cassette Recorder, Channel Master, Model 6392 (DS) 1/56 Cassette Recorder, General Electric, Model M8710 (DS) 5/56 Cassette Tape Deck, Sanyo Electric Inc., Model 4250 (DS) 1/55 CD -4 Demodulator, The Marantz Co., Model CD -400 (DS) 12/48 Distributor Amplifier, Ramko Research, Model DA-6BR (NP) 2/50 Eight -Track Cartridge Record Deck, JVC Model ED -1245 (DS) 8/51 Eight -Track Player, Panasonic Dynamic 8 (DS) 9/55 Electronic Adjustments in Auto Tape Players 7/38 Erratic Tape Speed, Eight -Track Tape Player, Magnavox Model

VE15-01, 02, 05, 06 (TD) 5/48 FM/AM/Radio/Cassette Recorder, Sony Model CF -310 (DS) 5/58 Four-Channel/Stereo Amplifier, Marantz Co., Model 4070 (DS) 6/56 Full Logic SQ Decoder, Superscope Model SQA-2 (DS) 10/56 Head Demagnetizer, Nortronics Co., Inc., Model QM -202 (NP) 8/47 Headphone Control Box, GC Electronics No. 30-5250 (DS)10/53 Headphones, GC Electronics No. 30.5205 (DS) 6/56 Headphones, Panasonic Model EAH-23 (DS) 12/48 Microphone, Astatic Corp. "Trucker" 9/52 Microphone Gain Control, Shure Brothers Inc., Model M625 . (NP) 7/49 Motor Failure, Admiral Tape Player Chassis 8Y6 (TD) 8/10 Motor Replacement, Magnavox, 8 -Track Tape Players

IK8869/701404, 05, 06, 23, 24 (TD) 10/14 Needle and Cartridge Display, Pageant/MA Miller Industries (DS) 12/48 Needle Merchandiser, EV-Game Needle Finder (DS) 12/48 Phone Plug Adapters, ITT Pomona Electronics Model 4043 (DS) 11/43 Phonograph Needles, EV Game No. SNK-6 (DS) 5/56 Quadraphonic Audio Console, GTE Sylvania Inc., Model QCT 4648A (DS) 11/46 Record Cleaner, VOR Industries "VAC-O-REC" (DS) 10/54 Recorder Erase Head, Nortronics Co., Model FD-TE4 (NP) 1/49 Recorder Test Set, 3M Model 6500 (TR) 1/41 Recording Tape Eraser. Nortronics Co., Inc., Model QM -211 (DS) 6/57 Selecting Commercial Audio Amplifiers 8/34 Selecting Speakers for Commercial Audio Systems 6/30 Speaker, Atlas Sound Model AP-15TU (DS) 8/49 Speaker Baffle, Electra Sound Series FS (NP) 3/48 Speakers, Benjamin Electronic Sound Co., Models CS-1/CS-20 .. (DS) 9/52 Speakers, Sound West Inc. "Extraspeakers" (DS) 6/59 Speech Recognition System, Shields Products, Inc. (NP) 2/48 Square -Wave Testing of Audio Amplifiers 9/92 Stalled or Slow Speed Turntable, Magnavox Record Changer

Model W712 7/47 Stereo Amplifier, GC Electronics Cat. No. 305015 (DS) 1/56 Stereo Audio Measurements 6/24 Stereo Cassette Deck, TEAC Corp., Model 160 (DS) 2/52 Stereo Needle Lock, Se -Kure Controls, Inc., Diamond Needle Lock (DS) 8/49 Stereo Speaker Set, RCA Model 12R403 (DS) 12/47 Stereo System, Magnavox Model E1018 (DS) 2/52 Stereo Turntable, JVC America, Inc., Model JL-B44 (DS) 9/57 System Offers Three Ways to Build Receiver Sales 1/23 Tape Deck, Sansui Electronics Corp., Model QD-5500 (DS) 2/52 Tape Deck, Sony Model TC -755 (DS) 4/66 Tape Head Cleaners, 3M Co. (DS) 7/50 Tape Player/Recorder, 3M Co., Model 8075 (DS) 2/52 Tape Recorder, Hitachi Model TSC-8800 (NP) 1/20 Turntable, BSR Model 620AX (DS) 3/50 Turntable, Sansui Model SR -212 (DS) 5/56

AUTO ELECTRONICS

AM/FM Auto Radio, Audiovox Corp., Model ID -200 (DS) 10/56 Antenna Coupler, Gold Line, Model GLC 1079 (DS) 7/50 Auto Alarm, Detection Systems (DS) 11/47 Auto Cassette Player, Audiovox Corp., Model C984 (DS) 6/56 Auto Cassette Player, Pioneer Electronics, Model KP345 (DS) 11/46 Auto Cassette Tape Player, Lear Jet Stereo Model A-72 (DS) 8/50 Auto FM Amplifier, Antennacraft (DS) 3/50 Auto FM/AM Stereo Preamplifier, ASCOM Products, Model ASC-100 7/48 Auto Stereo Speakers, Pioneer Electronics Chameleons (DS)(NP) 10/54 Car Stereo, Aiko America Corp., Model ACS -217 (DS) 1/54 CB Mobile Radio, EF Johnson, Model 130 (DS) 4/66 CB Transceiver, Fanon/Courier Corp., Rebel 23+ (DS) 1/56 Electronic Adjustments in Auto Tape Players -7/38 FM Transceiver, Genave, Model GTX-100 (DS) 4/67 Four Channel Car Stereo, RCA Model 12R800 (DS) 1/55 Mobile Antenna, Antenna Specialists Co., Model ASP -800 (NP) 9/50 Mobile CB Antenna, The Antenna Specialists Co., Super Can II (NP) 6/51 SSB/AM CB Two -Way Radio, Tram Corp., Diamond 60 (DS) 5/57 Stereo Cassette, Channel Master, Model 6622 (DS) 10/55

BUSINESS MANAGEMENT

Does Servicing Have a Future? 7/20 Effective Advertising for the Service Dealer 8/Y6 Getting More Out of That New Sign 1/30 Going to Remodel the Store? Here's a Good Check List 2/30 Managing to Learn and Learning to Manage 1/42 Managing to Learn and Learning to Manage 2/37 Managing to Learn and Learning to Manage 3/41 Managing to Learn and Learning to Manage 5/42 Profitable and Competitive Pricing of Service Labor 12/12 Replacement Color Picture Tubes-Propping up Servicers' Profits 8/24 Retirement Programs for Owner/Employees 3/39

B -W TV

B/W TV Power Sentry System, Zenith Radio Corp. (DS) 9/53 Circuit -Board Modifications, General Electric Chassis SF (TD) 1/48 Console Cabinets-Lid Supports, Admiral (TD) 2/47 Fuse and Resistor Modification, Zenith TV Chassis 12CB127X/

16DB12X (TD) 2/47

General Electric Video Display Chassis MUA Chassis Description ... (TD) 3/24 How and Why-Trapezoidal No Vertical Sweep, Admiral TV Chassis TK3 (TD) 2/47

Picture Tube Mounting Ring Removal, Philco-Ford 19 -inch Models (TD) 5/339/14 Picture Tube Repairs

Product Safety Maintenance, Admiral (TD) 7/46 Service Check of Filament Diode Rectifier 34-8054-23

Philco-Ford Monochrome TV Chassis (TD) 10/14

Servicing Solid -State AGC Circuits 11/24

Solid State Tubes, EDI (NP) 5/54

Symptoms Caused by Shorted IC301, General Electric Chassis SF (TD) 4/58

Troubleshooting Solid -State Multivibrators 12/28 UHF Tuner, General Electric Chassis U1/UA (TD) 4/58 Vertical Stretch and/or Double Picture, MGA TV Models

BT-120/BT-121/BT-122 (TD) 1/48

COLOR -TV

Admiral Chassis M25 (TL) 4/27

Audio Output Module, Magnavox 612046-202 (CF) 5/47

Board and Module Modifications, Magnavox Chassis T979/989 (CF) 2/44 Brightness and Contrast Control Adjustment, Admiral Chassis M10 (TD) 11/6

Buzz or Hum at Low Setting of Volume Control, Philco-Ford

Chassis 22QT80, 21KT40/41 (TD) 10/14

Cleaning Precautions, Magnavox 21 Detent Tuner (CF) 4/57

Components Kit, RCA No. 199006 (NP) 10/48

Digital Channel -Indicator Dimmer Circuit, Magnavox Chassis 1989 (TD) 8/10 Dressing of Focus Capacitor, Zenith Chassis 19DC12/22/28 (CF) 2/45

Eight -Function Remote Control, Magnavox Chassis T989 (CF) 6/47

Excessive Contrast, Magnavox Chassis 1989 (CF) 2/44

Failure of Resistor R742, Magnavox Chassis 1924/939/950 (CF) 2/44

GTE Sylvania TV Chassis E06 (TL) 5/23

GTE Sylvania TV Chassis E06-2, Part 2 (TL) 6/18

High -Voltage Repair Kit, Tele Matic Model HVK630 (NP) 2/51

High -Voltage "Ticking/Sizzling" Sounds, General Electric Chassis "C" (TD) 12/40

Hookup to Test Fixtures, Magnavox Chassis T989 (TD) 11/9

Horizontal Bending or Pulling in Picture, Admiral Chassis

K18, K19 Series (CF) 5/46

Horizontal Deflection Tube, RCA Triple -Boarded 6MJ6/6LQ6/Q1E6C (TD) 8/10

Horizontal Weaving, MGA Model T50 (CF) 2/43

How and Why Trapezoidal Hum at Low Volume Level, Magnavox Chassis T989 (CF) 4/57

Hum Bar in Picture at 60 Hz Rate, Admiral Chassis K19 Series (CF) 8/38

Hum Bar, Magnavox Chassis T948 (CF) 5/47

Intermittent Brightness Variation, Magnavox Chassis T989 (CF) 4/57

Intermittent or No Video and No Sound with White Raster,

Admiral Chassis T14K10/T41K10 Series (CF) 5/46

Loss of Sound, Admiral Models 5L5851, 5L5853, 5L5855 (CF) 8/38

Magnavox, TV Chassis 1982. Part I (TL) 2/23

Magnavox, TV Chassis T982, Part 11 (TL) 3/23

Medium Level Snow on UHF Channels Using VVC Tuner, 11/8

Philco-Ford Chassis 4C572/4CY91 (TD)

Modification for CATV Systems, MGA Chassis 150 (CF) 2/43

Modification for CATV Systems, MGA Chassis T50 Series (CF) 1/46

Modifications, Magnavox Chassis CE (TD) 8/10

Module Cross -Reference Guide, Zenith (CF) 2/46

Module Removal, Magnavox Color TC Chassis 1995 (TD) 12/41

New in Color TV for 1975-Part I

10/24 New in Color TV for 1975-Part II 11/28

New in Color TV for 1975-Part III 12/20 New in Color TV for 1975-Part IV

No Color, Admiral Chassis K10 (TD) 12/40

Noise Immunity Circuits, Motorola TV Color/Video Panel LA/MA/WA (CF) 4/57

Panasonic Model CT -944 (DS) 3/50

Picture Tube/Deflection Yoke Replacement, Admiral Chassis M10 (TD) 10/2

Picture Tube Repairs 5/33

Power Supply Diode Failures, Magnavox Color TV Chassis

T981/T982/T987 (TD) 12/40

Power Supply Module M900 (A8926-1), Admiral Chassis M25 (CF) 8/39

Quick -On Wiring, Magnavox Chassis T995 (TD) 10/12

Remote Control UHF AGC Improved, Magnavox Chassis T989 (CF) 7/47

Replacement Color Picture Tubes-Propping Up Servicer's Profile 8/24

Replacement Picture Tube, RCA "Colorama A" (DS) 9/56

Ringing Bars on Left Side of Picture, Magnavox Chassis 1989 (CF) 2/44 Sense and Nonsense Color TV "Case History" Faults

Vector Diagram (CF) 1/44

Service Hint, Admiral Chassis 3K19 (TD)

7/46 11/24 Servicing Solid State AGC Circuits

Solid -State Tubes, EDI (NP) 5/54 Solving Sync Problems in Solid -State TV 12/25

Sony's Wide -Angle Trinitron Color TV (TL) 8/14

Sound Problems, MGA Models CH160, CH190, CH191 (CF) 8/40

Test Rig, Tele Matic Model CJ (NP) 4/46/47

The Making of a Color TV Picture Tube

Thin Vertical Line Near Left Edge of Screen, Motorola TV

Chassis, TS -934 (TD) 7/47

Troubleshooting Solid -State Multivibrators 12/28

Troubleshooting the Power Supply Magnavox TV Chassis T989 ....(CF) 3/43 TV High -Voltage Tripler, Motorola HEP R3201 (NP) 2/18 Vector Diagrams, General Electric (CF) 1/44 Vertical Black Line at Top and at Bottom of the Screen, Magnavox (TD) 11/9

Vertical Line on Left Side of Raster, Magnavox Chassis 1979 (CF) 8/39 Vertical Oscillator/Drive Module 703616-1, Magnavox (CF) 2/45

Vertical -Output Transistors, Admiral Chassis, M24/M25/M30 (TO) 9/14

Vertical Problem and Yoke Capacitor C16, Magnavox "D" Panel 703505-1 (CF) 5/46

Vertical Shaded Lines, General Electric Chassis HE (CF) 1/45 Vertical Shading Bars, Magnavox Chassis 1995 (TD) 10/12

Voltage Sensor Circuit, Zenith Chassis 25DC57 (CF) 1/46

COMMERCIAL TWO-WAY

FM Transceiver, Genave Model GTX-100 (DS) 4/67

Superior Baby Foods 1

Transceiver, Com Data Model HT -910 (DS) 4/66 VHF High Band Monitor/Receiver, Channel Master Model 6258 (DS) 12/46

COMMUNICATIONS CB

CB Mobile Radio, E.F. Johnson Model 130 (DS) 4/66 Servicing Two -Way Radio 2/34 SSB/AM CB Two -Way Radio, Tram Corp. Diamond 60 (DS) 5/57

SSB/CW Transceiver, Hallicrafter Model FPM -300 Mark II (DS) 9/43

The Expansion of Citizens Band 12/34

Transceiver, Fanon/Coupier Corp., Rebel 234 (DS) 1/56 (DS) 12/49

Two -Way CB Receiver, Dynascan Model CAM -89

MERCHANDISING

Antenna Display, RCA Model MU -1937 (DS) 10/53

Car Stereo Display, Channel Master Car Stereo -Center (DS) 9/56

Car Stereo Display RCA Model MDS-1305 (DS) 1/55

CB Parts/Accessories Program, GC Electronics No. 49-810 (DS) 12/46

Consumer Products Displays, Channel Master (DS) 12/48

Digital Clock, General Electric Co. (DS) 12/47

Display Advertisements, General Electric (DS) 7/50

Effective Advertising for the Service Dealer 8/26 Electric Sign, BSR (DS) 9/54 Electronic Products, Mallory "Desert Deal" (DS) 9/55 Electronic Security Systems-A Natural for Electronic Servicers 10/36 MATV System Display, Jerrold Electronics (DS) 12/46 Monitor Receiver, Electrosonic Electro -Monitor (DS) 9/53 Needle and Cartridge Display, Pageant/MA Miller (DS) 12/48

Needle Merchandiser, EV-Game "Needle Finder" (DS) 12/48

Selling TV Antennas to CATV Subscribers 4/50 Stereo Speaker Merchandiser, Innovative Audio Systems

"Speaker Tree" (DS) 10/54 Stereophone Display, RCA Model MDA-1222 (DS) 3/50 System Offers Three Ways to Build Receiver Sales 1/23

Telephone Answerer Display, BSR Phone Butler (DS) 9/57 TV Antenna Display, RCA Model MLU-1606 (DS) 6/57

RADIO _

AM/FM Receiver, Superscope, Inc. (DS) 1/54

AM/FM Weather Band Radio, Panasonic Model RC -6304 (DS) 10/53 Coils and Transformers-A Perspective for Technicians 11/16 Dial Cord Guide Replacement, RCA Tuner/Amplifier Models

VZT100/VST113 (TD) 3/44 FM/AM/Radio/Cassette Recorder, Sony Model CF -310 (DS) 5/58 Four -Channel System, Panasonic Model SA -8000X (NN) 1/20 Four -Channel Receiver, Sylvania Model RQ3746 (DS) 4/66 Multi -Band Portable Radio, Magnavox Model 3092 (DS) 11/47

Multi -Band Radio, Magnavox, Model 3090 (DS) 7/50 Portable Radio, General Electric Model P4970 (DS) 6/59 Stereo System, Magnavox Model E1018 (DS) 2/52 Volume Control, Admiral Model YH401 (TD) 7/46

OFFICE EQUIPMENT

Digital Clock/Calculator, RCA Model 3C3030 (NP) 2/49 Electronic Calculator, Texas Instruments Model TI -2550 (NP) 3/48 Phone Answering System, Channel Master Model 6000 (DS) 10/56 Telephone Answerer, Phone -Mate, Inc., Model 300 (DS) 1/55 Telephone Answering/Recorder System, Ford Industries

Memory Phone (NP) 8/45 Telephone Silencer, Diversitron Inc. (DS) 1/54

SECURITY & SURVEILLANCE SYSTEMS

Alarm Installers' Tool Kit, Mountain West Alarm Model MW -700 (NP) 3/46 Alarm System, PLC Electronics Inc. Model 740 (NP) 1/52 Electronics in Modern Hospitals-A Varied and Vital Role 5/36 Electronic Security Systems-A Natural for Electronic Servicers 10/36

Electronic Watchman, Dytron Inc. "The Care Taker" (NP) 2/48 Home Alarm Sets, Master Lock Co. "Snap On" (DS)10/53 Motion Detection System, Mountain West Alarm Model M4 (DS) 12/48

Superior Baby Foods 2/31

SEMICONDUCTORS (General)

Current Gain 6/44 Bipolar Transistors, What Every Good Technician Should Know

About Replacing Them 6/42 Collector Voltage 6/42 Conventional Bipolar Power Transistors 7/18 Darlington Power Transistors 7/17 Discrete Semiconductor Devices 3/30 FET Theory 8/28 Field -Effect Transistor Fundamentals 8/28 High -Voltage Regulators 9/30 High -Voltage Tripiers 9/31

Integrated Circuits 3/31

Integrated Circuits and Modules, GTE Sylvania ECG 1000 Series (NP) 10/50

Linearity 6/45

LASCR 1/36

LED's 1/31

Low -Voltage Power Supplies 9/28

Modules 3/32 Optoelectronics, ABC's of 1/31

Output Capacitance 6/45

Photoconductive Cell 1/33

Photo Coupler 1/36

Photodiode 1/34


Photoemissive Cell 1/33 Photo FET 1/35 Phototransistor 1/35 Photovoltaic Cell 1/33 Power Dissipation 6/43 Rectifier Replacement 5/31 Rectifier Theory 5/30 Reverse Breakdown Voltage 6/43 Semiconductor Diode Theory, Testing and Replacement 5/28 SCR's and Power Transistors 7/14 Testing and Replacement of Discrete Semiconductor

IC's and Modules 3/30 The Dual -Gate JFET 8/31 The MOSFET 8/31 The SCR 7/14 Transistors, International Rectifier Corp. 10/49 Transistors, IRC Kit DK20 (NP) 8/42 Troubleshooting SCR Circuits 7/14 Troubleshooting Solid -State Power Supplies 9/28 Varactor Tests 5/29 Varactor Theory 5/28 Zener Diode Tests and Replacement Selection 5/30 Zener Diode Theory 5/29

SERVICE AIDS

A Realistic Approach to TV Tuner Trouble 10/20 Capacitor Mount Adapters, Sprague Products Inc., Type PC -8 (NP) 6/52 Chemical Cleaner, CRC Chemicals Lectra Clean (NP) 10/48 Cleaning Aerosol, Falcon (NP) 2/51 Contact Cleaner, CRC Chemicals Inc. (NP) 6/49 Contact Cleaner, 3M Co., No. 1613 (NP) 8/43 Electronic Chemicals, Workman (NP) 2/49 High -Voltage Repair Kit, TeleMatic Model HVK630 (NP) 2/51 Omni -Direction Tuner Spray Nozzle, Tech Spray "Omni-Spra" (NP) 12/42 Service Chemical Cole -Flex Corp. CD -250 (NP) 4/63 Solder, GC Electronics No. 9132 (NP) 5/51 Tuner Cleaning Pads, PTS Electronics Inc. (NP) 6/52 Tuner Lubricant/Cleaner, PTS Electronics, Inc., No. 108 (NP) 12/46 W Tuner Cleaner/Lubricating Kit, General Electric (NP) 12/42

SHOP EQUIPMENT

Alarm Installers' Tool Kit, Mountain West Alarm Model MW -700 (NP) 3/46 Bench Power Supply, Central Components Co., Model C621 (NP) 1/53 Burnishing Tool, Utica Tool Co. Inc. (NP) 7/48 Cable Sheath Stripper, P.K. Neuses, Model N-2878 (NP) 5/54 Cable Stripper, ITT Holub Industries "Roto -Blade" (NP) 10/49 Cordless Soldering Iron, Weller (NP) 11/43 Desoldering Kit. Enterprise Development Corp., Model 500K (NP) 2/50 Desoldering Tips, Enterprise Development Corp. (NP) 12/42 Desoldering Tool, Edsyn No. DS017 (NP) 2/48 Desoldering Tool, Solder Removal Co. (NP) 1/49 Drill Bit, Unibit Corp., Model II (NP) 10/50 Electrical Plug Lock, Mercury Manufacturing (DS) 5/58 Hand Tools, ITT Holub Industries (NP) 3/48 Head Demagnetizer, Nortronics Co., Model QM -202 (NP) 10/52 Inverter, EPS Co., Model TI -2508 (NP) 8/43 Metric Hex Key Set, Vaco No. 70156 (NP) 4/62 Metric Hex Socket Screwdriver, Xcelite No. LN-8MM (NP) 5/52 Metric Nutdriver Set, Xcelite Model PS-121MM (NN) 3/20 Mobile Shelf Carrier, SGL Waber Electric Model Low (NP) 5/54 Parts Case, General Electric ETRS-5980 (NP) 8/42 Parts Chest, AMP Special Industries (NP) 6/53 Parts Rack, RCA Model QT (DS) 8/49 Parts/Storage Bins, Kole (NP) 9/51 Relay Service Tool Kit, P.K. Neuses, Inc., Model TK -18 (NP) 4/63 Screwdriver Sets, Xcelite Model 99-PS41MMBP (NP) 4/60 Self -Adjusting Wire Stripper, ITT Holub No. 18-10 (NP) 5/50 Self -Adjusting Wrench, Brookstone Co. (NN) 2/8 Service Table, RCA Model 101107 (NP) 1/49 Socket Wrench, P.K. Neuses, Inc., Model N-311 (NP) 2/50 Solder, GC Electronics No. 9132 (NP) 5/51 Soldering Iron Accessory, Edsyn, Inc., No. HA120 (NP) 4/64 Soldering Iron Holder, Wolo Manufacturing Corp. (NP) 9/50 Soldering Iron Tip Cleaner, Solder Removal Co., "Re -Tip" (NP) 6/49 Soldering Iron, Ungar No. 555 (NP) 11/45 Soldering Iron, Wahl Model 7500 (NP) 4/60 Soldering Iron, Wall -Lenk Manufacturing Co. (NP) 3/47 Temperature Probe, Edsyn, Inc., Part No. TP110 (NP) 3/48 Test Rig High -Voltage Meter, TeleMatic Model HVM 3900 (NP) 12/43 Test Rig, TeleMatic Model CJ (NP) 3/47 Tool Case, Howe Industries (NP) 1/52 TV Test Rig, Telematic, Model M1-195 (NP) 10/50 Voltage Regulator, Air -Vac Engineering Co. (NP) 7/48 Wire Unwrap Tool, O.K. Machine and Tool Corp., Model UW 2832C (NP) 1/49 Wiring Tool and Crimper, Vaco Products Co., Wireplier (NP) 5/55

TELEVISION (General)

A Realistic Approach to TV Tuner Troubles 10/20 Coax On Twin Lead -Making the Choice 4/32 Coils and Transformers-A Perspective for Technicians 11/16 Fault Finding In MAW Systems 4/36 Flameproof Film Resistors RCA (NP) 12/42 Flip -Flops (Bi -Stable Multivibrator) Sylvania (TD) 5/48 FM Interference 3/28 Ghosts and Smears 3/29 How and Why-Trapezoidal 2/27 How to Tackle a Real Dog 2/33

Ignition or Powerline Interference 3/27 Picture Tube Repairs 5/33 Product Safety Maintenance, Admiral (TD) 7/46 Servicing Solid -State AGC Circuits 11/24 Seventy Detent UHF Tuner Selector Knobs, Admiral Current

W Models (TD) 10/12 "Snowy" Picture 3/29 Sockets, Zenith Kit No. 39 (NP) 4/65 Solid -State Tubes, EDI (NP) 5/54 Solving Sync Problems in Solid -State W 12/25 Strong Local Channel Interferes with Distant Channel 3/28 Troubleshooting Solid -State Multivibrators 12/28 TV Interference-Causes and Cures 3/27 TV Remote Control, Jerrold Electronics Model TRC-12 10/54

TEST INSTRUMENTS

AC Leakage Tester, RCA Model WT -540A (NP) 5/50 Amplifier Checker, Sencore Model TC28 (NP) 9/49 Audio Sweep/Function Generator, Wavetek Model 30 (NP) 6/53 B & K Precision Model 1431 Oscilloscope (NP) 4/52 Circuit Tester, Western Technical Products Safetone Tracer (NP) 9/49 Color Bar Generator, Hickok Model 239 (TR) 2/36 Communications Counter, Anadex Model CF -710 (NP) 12/45 Continuity Checker, Thomas & Betts E -Z -Coder Tone Tracer (NP) 10/48 Digita Multimeter, Ballantine Laboratories Model 3/24 (NP) 10/48 Digita Multimeter, B & K Precision Model 282 (TR) 6/38 Digita Multimeter, Data Technology Corp., Model 20 (TR) 3/42 Digita Multimeter, Data Technology Corp., Model 41 (NP) 9/48 Digita Multimeter, Data Technology Corp., Model 45 (NP) 4/64 Digita Multimeter, California Instruments Model DMM-51 (NP) 6/49 Digita Multimeter, Digitec's Model 2110 (NP) 9/51 Digita Multimeter, Digitec Model 2210 (NP) 9/51 Digita Multimeter, Keithley Model 168 (NP) 5/51 Digita Multimeter, MITS, Inc., Model DVM (NP) 2/50 Digita VOM, Dana Laboratories, Inc. (NP) 2/18 Digita VOM, Simpson Electric Co., Model 460-2 (NP) 5/50 Digita VOM, Simpson Mbdel 360 (NP) 3/46 Distortion Analyzer, Tucker Electronics Co., Model 510A (NP) 6/54 Dual -Channel, Triggered -Sweep Scope, Hewlett-Packard

Model 1220A (TR) 9/44 FET/Transistor Tester, Heathkit Model IT -121 (TR) 10/40 Field -Strength, Ascom Electronic Products Model ASM-105 (NP) 10/51 Field -Strength Meter, Sadelco Inc., Model FS3B VHF/UHF (NP) 10/52 FM Alignment Generator, Sound Technology Model 1000A 1/23 FM Deviation Meter, Radio Specialty Mfg. Co., Model 1163-63-1 (NP) 11/43 Frequency Counter, Heathkit Model 1B-1103 (NP) 4/64 Frequency Counter, Hewlett Packard Model 5381A (TR) 12/38 Frequency Counter, John Fluke Mfg. Co., Inc. Model 1980A (NP) 1/51 Frequency Counter, Scarpa Model SC -1A (NP) 2/50 Frequency Counter, Systron-Donner Corp., Model 6252 (NP) 2/50 Frequency Counter/Timer, Simpson Electric Co., Model 7016 (NP) 12/42 Function Generator, Datapulse Model 400 (NP) 2/48 Function Generator, Krohn -Hite Corp., Model 5200 (NP) 3/49 High -Voltage Probe, Triplett Model 79-70 (TR) 12/39 High -Voltage Test Probe, Pomona Electronics Model 4000 (NP) 5/53 Intermodulation Distortion Analyzer, Crown Model IMA (NP) 1/20 Multi Function Counter, John Fluke Mfg. Co., Model 1900A (NP) 10/50 Multitester, Weltron Co., Model 51-150 (NP) 4/62 Oscilloscope, Jermyn Scopex 4D-10 (NP) 6/52 Oscilloscope, Lectrotech Inc., Model TO -55 (NP) 6/50 Oscilloscope Probe, Valor Enterprise, Inc. (NP) 7/48 Oscilloscope/Quicktracer, RCA Model WO -33B (TR) 11/38 Oscilloscope, Scopes Unlimited Inc. (NP) 8/44 Oscilloscope, Sencore Inc., Model PS29 (NP) 10/52 Oscilloscope, Simpson Electric Co., Model 459 (NP) 9/48 Oscilloscope, Systems Electronic, Inc., Model 77 (NP) 8/45 Oscilloscope, Systems Model 57 (NP) 5/52 Picture Tube Tester, Sencore Inc., "Big Mack" (NP) 2/51 Portable Tester, Lisson Electronics Model SCELBI (NP) 8/44 Power Meter, Gold Line Model GLC 1087 (NP) 12/45 Recorder Test Set, 3M Model 6500 (TR) 1/41 Resistor Substitution Unit, Phipps O. Bird Model 236-A (NP) 10/49 RF Signal Generator, Dynascan Corp., Model 2050 (NP) 12/42 RF Wattmeter, Bird Model 4371 (NP) 4/61 Scope, Leader Instruments Model LBO -511 (NP) 2/48 Scope, Simpson Electric Co., Model 455 (NP) 1/50 Semiconductor Curve Tracer, Heathkit Model IT -1121 (NP) 6/54 Semiconductor Tester, Krystal Kits, Jinni -1 (NP) 9/50 Signal Conditioner, Sound Technology, Model 1100A 1/23 Signal Generator, Exact Electronics Model 123 VCF (NP) 1/52 Substitute Tuner, TeleMatic Model KT730 (NP) 5/50 Sweep/Function Generator, Exact Electronics Model 195 (NP) 8/47 TeleMatic Tuner -Mate Substi-Tuner, TeleMatic Model KT730 (TR) 5/40 Test Rig High -Voltage Meter, TeleMatic Model HVM3900 (NP) 12/43 Transistor/FET Tester, RCA Model WT -524A (NP) 10/52 Transistor/FET Tester, Sencore, Inc., Model TF26 (NP) 3/49 Tuner Subber, Castle W Mark IV (NP) 3/49 Universal Color Bar Pattern Generator, Leader Model LCG-395 (TR) 7/30 VHF Test Meter, Ascom Electronic Products, Model ASMR-100 (NP) 10/52 VHF/UHF Portable TV Tuners, PTS Electronics Model 3001 (NP) 3/20 VOM, Mura Model FET-300 (NP) 8/42 VOM, Simpson Electric Co., Model 265 (NP) 9/51 VOM, Triplett Corp., Model 310 (NP) 8/47 VOM, Triplett Corp., Model 615 (NP) 2/50

VEHICLES

Commercial Vehicle, Champion Home Builders (NP) 4/60 Truck Interior Shelf/Bin Units, Nandi Van Kole Enterprises (NP) 12/45

40 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1975

ARTICLE INDEX

ABC'S OF OPTOELECTRONICS 1/31

A REALISTIC APPROACH TO TV TUNER TROUBLES 10/20

BALANCING CHANNELS IN MATV SYSTEMS 10/32

COAX OR TWIN LEAD-MAKING THE CHOICE 4/32

COILS AND TRANSFORMERS-A PERSPECTIVE FOR TECHNICIANS 11/16

DOES SERVICING HAVE A FUTURE? 7/20

EFFECTIVE ADVERTISING FOR THE SERVICE DEALER 8/26

ELECTRONICS IN MODERN HOSPITALS-A VARIED AND VITAL ROLE 5/36

ELECTRONIC SECURITY SYSTEMS-A Natural for Electronic Servicers 10/36

ET/D READER PREFERENCE SURVEY 11/51

FAULT FINDING IN MATV SYSTEMS 4/36

GETTING MORE OUT OF THAT NEW SIGN 1/30

GOING TO REMODEL THE STORE? HERE'S A GOOD CHECK LIST 2/30

HOW AND WHY-TRAPEZOIDAL 2/27

HOW TO TACKLE A REAL DOG 2/33

INTERPRETING MATV AMPLIFIER SPECS 9/38

MANAGING TO LEARN AND LEARNING TO MANAGE 1/42

MANAGING TO LEARN & LEARNING TO MANAGE 3/41

MANAGING TO LEARN AND LEARNING TO MANAGE 5/42

MANAGING YOUR BUSINESS-Retirement Programs for Owner/

Employees 3/39

MATV TAPS-SELECTION AND USE 7/22

MODERN SERVICING TECHNIQUES-Bipolar Transistors-What Every

Good Technician Should Know About Them 6/42

MODERN SERVICING TECHNIQUES-Field Effect Transistor

Fundamentals 8/28

MODERN SERVICING TECHNIQUES-SCR's and Power Transistors 7/14

MODERN SERVICING TECHNIQUES-Semiconductor Diode Theory,

Testing and Replacement 5/28

MODERN SERVICING TECHNIQUES-Testing and Replacement of

Discrete Semiconductors, IC's and Modules 3/30

MODERN SERVICING TECHNIQUES-Troubleshooting Solid -State

TV Power Supplies and Regulator Circuits 9/28

NEW IN COLOR TV FOR 1975-Part 1 9/16




PROFITABLE AND COMPETITIVE PRICING OF SERVICE LABOR 12/12

REPLACEMENT COLOR PICTURE TUBES-Propping up Servicers' Profits 8/24

SELECTING COMMERCIAL AUDIO AMPLIFIERS 8/34

SELECTING SPEAKERS FOR COMMERCIAL AUDIO SYSTEMS 6/30

SELLING TV ANTENNAS TO CATV SUBSCRIBERS 4/50

SENSE AND NONSENSE COLOR -TV "CASE HISTORY" FAULTS 1/37

SERVICING SOLID-STATE AGC CIRCUITS 11/24

SERVICING TWO-WAY RADIO 2/34

SOLVING SYNC PROBLEMS IN SOLID-STATE TV 12/25

SONY'S WIDE-ANGLE TRINITRON COLOR TV 8/15

SQUARE -WAVE TESTING OF AUDIO AMPLIFIERS 9/32

SUPERIOR BABY FOODS 2/31

SYSTEM OFFERS THREE WAYS TO BUILD RECEIVER SALES 1/23

TECH BOOK DIGEST-Electronic Adjustments in Auto Tape Players 7/38

TECH BOOK DIGEST-Picture Tube Repairs 5/33

TECH BOOK DIGEST-Stereo Audio Measurements 6/24

TECH BOOK DIGEST-Troubleshooting Solid -State Multivibrators 12/28

TEKLAB Report-Admiral Color TV Chassis M25 4/27

TEKLAB Report-GTE Sylvania Color TV Chassis E06-Part 2 6/18

TEKLAB REPORT-Magnavox Color TV Chassis T982-Part 1 2/23

TEKLAB REPORT-Magnavox Color TV Chassis T982-Part 2 3/23

TEKLAB REPORT-Sylvania Color TV Chassis E06 5/23

TEST INSTRUMENT REPORT- B & K Precision Model 282 Digital

Multimeter 6/38

TEST INSTRUMENT REPORT-B & K Precision Model 1431 Trigger -

Sweep Scope 4/52

TEST INSTRUMENT REPORT-Data Technology Model 20 Digital

Multimeter 3/42

TEST INSTRUMENT REPORT-Hewlett-Packard Model 1220A Oscilloscope 9/44

TEST INSTRUMENT REPORT-Hickok's Model 239 Color Bar Generator 2/36

TEST INSTRUMENT REPORT-Leader LCG-395 Universal Color

Bar Pattern Generator 7/30

TEST INSTRUMENT REPORT-Measuring DC Beta with the

Heathkit Model IT -121 FET/Transistor Tester 10/40

TEST INSTRUMENT REPORT-RCA Model WO -33B Oscilloscope 11/38

TEST INSTRUMENT REPORT-TeleMatic Tuner -Mate Substi-Tuner

Model KT 730 5/40

TEST INSTRUMENT REPORT-Reviewing Specifications for 3M's 1/41

Model 6500 Recorder Test Set

THE EXPANSION OF CITIZENS BAND 12/34

THE MAKING OF A COLOR PICTURE TUBE 4/46

TV INTERFERENCE-Causes and Cures 3/27

3111111111OMMII

immumuntion imminve t -

Heath's new 4530 a professional TV service scope with a practical price It's hard to find a better TV service scope value than the new Heathkit 4530. Features like TV coupling, DC -10 MHz bandwidth, wide -band triggering capability, sensitive 10 mV/cm Ver-

tical input and calibrated X -channel input make it a versatile, easy -to -use scope every service technician will appreciate.

Trigger circuits are digitally controlled, requiring only a level control and a slope switch. Various trigger signals can be selected: a sample of the vertical input signal, a sample of the line voltage or an externally applied trigger signal. In the TV

trigger coupling mode, the 4530 can be easily triggered on the vertical or horizontal signal in a composite video signal such as the one shown above. Trigger bandwidths are guaranteed to 15 MHz, AC and DC coupled. A low-pass filter with 1 kHz

cut-off is used in the TV coupling mode.

High or low frequency waveforms are no problem since the 4530's wide range of time bases can be switched from 200 ms/cm to 200 ns/cm. And any sweep can be expanded five times.

The 4530 is one of the few single trace scopes available with two input channels. For true X -Y operation, a calibrated X -input is provided with maximum sensitivity of 20 mV/cm.

The 4530 is easy to operate, easy to service and offers a lot of performance per dollar. The 10-4530 is available in easy -to - assemble kit form for only $299.95*. Or order the factory as-

sembled and calibrated SO -4530, just $420.00*.

Send for your free Heath catalogs The latest Heath/Schlumberger Assembled Instruments Catalog features a complete line of high performance, low cost Instru- ments for service and design applications. Our '75 Heathkit Catalog describes the world's largest selection of electronic kits - including a full line of lab and service instruments. Send for your free copies today.

HEATH COMPANY Dept. 24-1 Benton Harbor, Michigan 49022

D Please send the 1975 Heathkit Catalog.

D Please send the latest Heath/Schlumberger Assembled Instruments Catalog.

Name

Title Company/Institution Street

City State MAIL CROER PRICES, F.O.B. FACTORY. PRICES 6 SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

HEATH

Schlumberger

71p TE-316



e lake your

uìck PROFESSIONAL SCREWDRIVERS

BY Xcelite LARGEST RANGE, GREATEST VARIETY

.'.,.I.

o

Mr1111111111M1

11B11311111111111131111111111111111111 o

What are you driving? Slotted, Phillips, Frearson, Reed & Prince, Allen hex, clutch head, Scrulox®, Bristol Spline, or Pozidriv® screws? Xcelite makes screwdrivers for every type and size. Metrics, too.

from 2-1/8" miniatures to huge 2 footers. .040" to 7/16" tip widths. round or square blades.

tough, forged alloy steel

nickel chrome, black oxide finish, or insulation coated. fixed -handle or interchangeable blades.

straight and tee handles - regular and ratcheting available individually or in handy kits.

Made in U.S.A. to highest standards.

Ask your local distributor or write ... Weller-Xcelite Electronics Division a1 The Cooper Group COOPER ORCHARD PARK, N. Y. 14127 INDUSTRIES

...for more details circle 134 on Reader Service Card

TEST INSTRUMENT REPORT

Tekelec Model TA 357 Digital Multimeter IN Equipped with a 31/2 digit, field- effect, transmissive, liquid crystal display, the Model TA 357 multimeter is capable of measuring DC and AC voltages ranging from 100 microvolts to 19.99 Kv (50 Kv with optional probe), DC and AC currents ranging from 100nA to 199.9ma, and resistances ranging from .1 ohms to 199.9 K ohms. In addition, a special + 10v DC output permits measurement of leakage currents and conductance (up to 200 x 10-6mho).

Functions and ranges are selected by eight interlocked pushbuttons on the front of the instrument. Selection of either the voltage or current measuring function is accomplished by pushing in the buttons labeled "V" or "I," respec- tively, and then either pushing in the AC/DC button for AC measurement or releasing it to the out position for DC measurement. Illumination of the letters "AC" or "DC" on the right of the numerical display automatically tells you whether the instrument is in the AC or DC measuring mode. In the DC mode, the polarity of the voltage or current is automatically indicated by the appearance of either a - or -+ sign on the left of the numerical display. In the current measuring mode ("I" button pushed in), the letters "mA" also appear to the right of the numerical display. Selection of the resistance measuring function is accomplished by pushing in the button labeled "fl," which causes the designa-

tion "KSl!" to appear to the right of the numerical display.

Selection of one of the four ranges of the TA 357 is accomplished by pushing in either the ".2," "2," "20" or "200/LINE TEST" buttons. The decimal point in the display is automatically positioned by the range pushbuttons.

Zeroing of the instrument is accomplished by a thumbwheel type control labeled "Zero" on the top of the instrument.

If the quantity being measured exceeds the full-scale capability of the range selected, the display flashes on and off, clearly indicating the over - range condition.

The TA 357 is designed to be powered by 117 VAC, 60 Hz but is available in an optional version which operates on 220 VAC, 50 Hz. The line voltage applied to the instrument is automatically measured and displayed without external probe connections when the ON/OFF/TEST SWitCh is pushed down to the spring -loaded TEST position and the V, 200/LINE TEST and Ac/Dc BUTTONS are pushed in.

The multimeter is protected by a .25 -amp fuse in the primary of the power supply and a .25 -amp fuse in the input circuit. Both fuses plus a spare are located beneath a slide -out panel on the bottom of the instrument.

Input impedance in the voltage measuring modes is 10 megohms shunted by less than 100 pf of capacitance. The frequency range for AC voltage and current measurements is 40 Hz to 20 KHz.

Current through resistances being measured is 1 mA in the ".2" and "2" ranges, and .01 mA in the "20" and "200" ranges. The maximum voltage which can be safely applied to the input circuit in the voltage and resistance measuring modes is 480 volts p=p. In the current measuring modes, the input circuit appears as a short to input voltages in excess of 3.6 volts.

Tekelec's Model TA 357 is housed in a high -impact cycolac case which is 23/8 inches high by 51/4 inches wide by 91/2 inches deep.

Price of the TA 357 is $179, complete with test leads and a 100:1 high - voltage (20 Kv) probe. An optional 50 Kv high -voltage probe is available for $39.95.

For more information about this test instrument, circle 900 on the READ- ER SERVICE CARD.


TECHNICAL DIGEST

The material used in this section is selected from

information supplied through the, cooperation of the

respective manufacturers or their agencies.

MAGNAVOX Radio Chassis R331/332-Diode Reversed

The Audio Driver modules used in these chassis, Part No.

703688-1, have diode D403 incorrectly screened on the PC

board. Because of this error, the initial production of these

chassis has the diode installed backwards. The symptoms that may occur are bass distortion and possible Automatic Protection Circuit Activation. Production is now installing the diode correctly. The correct polarity of the diode is

cathode of D403 to emitter of Q408. These chassis are used in Model KE1570 and KE1580.

Radio Chassis R286-Schematic Correction

The schematic in Service Manual 1526 has two errors in the audio output section. Resistor R230 should be in parallel with D202 instead of D206. Resistor R231 should be in

parallel with D203 instead of D207. The copper layout in

the manual is correct.

Color TV Chassis-High Voltage Rectifier/Tripler Short

In cases of high voltage/ tripler failure in early production TV sets using these chassis, there is a possibility that the horizontal output transformer, T302, and other asso-

ciated components may be damaged. Other components to check when this type of failure occurs include: Capacitor C104, resistor R140, the power supply diodes, and the

Video Delay module. The possibility of multiple component failure can be pre-

vented by changing R140 to a carbon film type 1K ohm re-

sistor (Part No. 230214-1025). Whenever these early pro-

duction units are in the shop, R140 should be changed to a

carbon film type resistor as preventative maintenance. Ele-

vate the resistor 1/4 -inch above the PC board. Current production (identified by the numeral 2 as the last digit of the model number such as CE4360WA12) uses a carbon film

resistor for R140.

Videomatic TV Sets-New LDR Holders

A new LDR holder assembly has been developed to mini- mize the possibility of LDR damage from static discharges. The new assembly is made of two parts-the holder (Part No. 143593-1) and the insert (Part No. 143592-1). The entire assembly is still removable from the front of the instru-

ment as usual, but to separate the holder from the insert the holder must be gripped as shown in illustration and squeezed to unlock it. This new assembly may be used to replace all original holders with the part number 142848 or 143290.

the BSG ONE

NEW IMPROVED

,msrartr Adhesive

Now a choice of 4 formulas . .. and in Big 1900 drop application container. SAVE BIG only $8.95 (less than the an application)

ORDER FROM YOUR ONEIDA DISTRIBUTOR

OR DIRECT FROM US.

seneida .m<rye»)

RANT-WEO

NIGH STRrwoTN

R"Io eoNDlko 4ol,relvi

Qs ONEIDA ELECTRONIC MFG,INC.

MP.O. Box 678 - Dept. 761-D Meadville, Pa. 16335


NEUSES NUMBERING AND LETTERING KIT Use for marking almost any type of background materials with non -fading, vivid, easy -to -read clean

marking. Ideal for marking switchboard panels, junction boxes, sub -assemblies, chassis, cables, wire, etc.

Contents: Peg rubber stamps 3/4", 3/8", 1/4", 3/16", 1/8". A -Z letters, numbers and symbols. Stamp repair sets. Fuse capacity stamps 3/8" and 3/16". Ink tubes for vermillion, yellow, black, white. Inking plate, knife, brushes, cleaning fluid. Housed in sturdy steel carrying case. 124" long x 71/2" wide x 5" deep.

Write for new catalog on the most complete line of small tools for the telephone, communications and electronic industries.

P. K. Neuses, Inc. Box 100 / Arlington Heights, Illinois 60006

PRECISION TELECOMMUNICATION TOOLS



DELUXE DIGITAL COLOR

CONVERGENCE GENERATOR

NOW AT A PRICE EVERYONE CAN AFFORD

ROCK SOLID PATTERNS

ALL IC COUNTDOWN CIRCUITS

QUARTZ CRYSTAL OSCILLATORS

2 FULL YEARS' WARRANTY

>VEAL COLOR GENERATOR

63 Oft l

111111 EIENCO NOOEl

MODEL $7995 SG -200 reg. $99.95

10 Patterns: Full & Gated Rainbow, 4

Crosshatch, 4 Dot, Die, Casted 1/e" Alu- minum Case.

o1Gt TAt CONVERGENCE GENFROTOR

NIN, ® OrJiS

1.111.18

MODEL $5995 SG -150 reg. $74.95

10 Patterns: B&W Bars, White Field, 4

Crosshatch, 4 Dot.

ElencoE/eenronh,

MODEL

SG -100

ONLY

$4795 reg. $59.95 `

2 Patterns: 20 x 16 Crosshatch, 320 Dots, weight only 11 oz.

SPECIAL PRICE LIMITED TIME ONLY

FULL 15 DAYS MONEY BACK GUARANTEE

ELENCO ELECTRONICS INC. 8744 W. North Ter., Niles, III. 60648 312-692-6974 MODEL SG -

D My check or money order enclosed.

D COD-Add $2.50 mailing & handling.

NAME

ADDRESS

CITY STATE ZIP

DISTRIBUTORS' INQUIRIES INVITED

... for more details circle 108 on Reader Service Ca d


NEW PRODUCTS Descriptions and specifications of the products in-

cluded in this department are provided by the manufacturers. For additional information, circle the corresponding numbers on the Reader Service Card in

this issue.

UHF MOBILE ANTENNA 700

Combines the most desired operating characteristics

The Antenna Specialists Co. has announced the development of a new antenna which combines all of the most frequently desired operating characteristics for UHF mobile antennas in- to one design. The Model ASP -830 features over 5 dB of gain and can handle 150 w of RF power continuously. It maintains a VSWR of less than 1.5:1 over a wide working bandwidth of at least 9 MHz, making it ideal for use in re- peater systems or for broadband monitoring. It achieves its performance characteristics through the use of a pair of 5/8 -wavelength radiators in a collinear design. Phasing is accomplished with a phasing coil assembly that is one-piece molded to the radiators. A threaded metal insert in the molded base provides the extra strength and durability of a metal -to - metal fitting.

OSCILLOSCOPE 701

Compact size

and lightweight

A compact 50 MHz dual -trace oscilloscope was introduced by Philips Test & Measuring Instruments, Inc., a subsidiary of North American Philips Corp. Designated the Model PM3240, the oscilloscope employs DC switching

Rr .. S

for all functions. A magnesium alloy casting and a switching power supply

346 Ways To Save On Instruments! EICO's Test Instruments line is the industry's most comprehensive because each instrument serves a specific group of professional needs. You name the requirement- from a resistance box to a

VTVM, from a signal tracer to a scope, from a tube tester to a color TV generator, etc., you can depend on EICO to give you the best professional value. Compare our latest solid state instruments at your local EICO Electronics Distributor, he knows your needs best-and serves your requirements with the best values!

"Build -it -Yourself" and save up to 50% with our famous electronic kits.

For latest EICO Catalog on Test Instruments, Automotive and Hobby Electronics, Eicocraft Project kits, Burglar -Fire Alarm Systems and name of nearest EICO Distributor, check reader service card or send 50e for fast first class mail service.

EICO-283 Malta Street, Brooklyn, N.Y. 11207 30 years of service to the Professional Serviceman. / EICO ? OI


serve to reduce the size and weight. Basic specifications of the oscilloscope includes 5 mV/div. sensitivity at full bandwidth and 10 nanosecond/ div. maximum sweep rate. The 50 MHz bandwidth and 7 nanosecond risetime can be displayed separate, alternate, chopped and X -Y modes. The high 1

MHz chopping rate helps to eliminate interference with displayed signals. The attenuator eliminates the need for external measuring of the X axis input. A separate delay timebase control has intensified screen indication and a 0.5 sec/ div. to 10 nsec/div. range. A full 8 by 10 centimeter screen with a 10 kv accelerating potential enables easy and detailed view ing at even the narrowest one-shot pulses. Price is $1470 without probes.

ACCOUNT COLLECTION SYSTEM

Simplifies follow-up and 702

speeds payment of overdue accounts

Ever Ready Label Corp. has developed the DART (Delinquent Account Re- covery Technique). The system is an extension of their line of collection stickers. In addition to the three Col- lection Stickers, other components of the system are: a rotary desk file with 3 by 5 Follow -Up Cards, and three small colored labels coordinated with the colors of the three Collection Stickers. When an account is overdue, basic data is entered on the Record Card and slipped onto the rotary file. Collection Sticker #1 (blue) is affixed to the statement to be mailed. The small colored label (also blue) is affixed to the edge of the card and becomes an indexed marker. The same

procedure is repeated with Collection Stickers #2 and #3, coordinated with the appropriate colored small labels. The Follow -Up Record Cards are printed on both sides and provide for the necessary current information. It also allows for personal phone contacts between statements. As partial

payments are made, they can be post- ed. And when payment is made in full, the card is easily pulled from the file. Price is $79.95.

DIGITAL MULTIMETER 703

Features a frequency counter and can measure capacitance

A digital multimeter, featuring a 41/2 -digit Sperry planar display in 44 ranges has been announced by PECK/

BOSS, Inc., Electronic Div. The Model 390 multimeter is a versatile bench type meter, a frequency counter and cro farads. The instrument has eight

it can measure capacitance in seven resistance scales from .1 ohms to 1000

ranges from 1 nano farad to 100 mi- continued on next page

- r-------- Pay$925 for the PANTS.

I I Get a $ 595 Shirt lettered

1 to advertise your business

1 FREE as a BONUS! WE WANT YOU to be our customer. And we'll

Ido anything to make it happen! Why? Be-

cause once you've experienced the quality, Ivalue and long wear of our vast array of work garments and accessories-the business - building impact of our lettered garments- you'll do business with us for a long time. And that's the whole idea.

ISo, we'll give you a 65% Dacron/35% Cot- ton Permanent Press $5.95 shirt free . .

lettered free . when you buy a pair of Iour Permanent Press Dacron/Cotton pants

at regular price. One day's wear will con- vince you that we should be your work

Iuniform source from now on!

PICK COLORS & SIZES HERE I PANTS COLORS: Navy blue, grey, green, blue or brown.

PANTS SIZES: Waist 28" thru 34"; Even 36" thru 50". Inseams: 28" thru 35rr.

SHIRT COLORS: White, light grey, blue, green or tan.

NECK SIZES: Small, Med., Lg., Xlg., XXIg. I(Short sleeves only with this offer). Just check exactly what you want on coupon below. Clip and mail with $9.25. We pay all shipping charges. Satisfaction guaranteed.

ELIN MANUFACTURING CO. Dept. 20, Rochester, Indiana 46975

I

I

I

I

I

I I I

SHIP TO:

ADDRESS

CITY & STATE

Permanent Press

PANTS:

Permanent Press

SHIRT:

Color Color

Waist Size

Inseam Short Sly. only

I enclose $9.25. Ship postpaid

Mail entire ad and $9.25 to ELIN MANUFACTURING COMPANY Dept. 20 Rochester, Ind. 46975.

Ma IBM MN BM IBM MN

Zip

am zwil OFFER

LIMITED: I One to a

customer I and to new

customers' only.

I I i I I I I I

?OLEDO SUPPLY,tO,

MIR

I I I

I

I I I

Print lettering for shirt here:

Lettering color. Check one.

_Red _Blue _Gold Gr J- - - - ... for more details circle 107 on Reader Service Card


NEW PRODUCTS... continued from preceding page

TV and FM ANT:NNAS AND ELECTRONCS

MR. DEALER - Return this ad with ypur letterhead For a FREE DEALER BONUS CCUPON, CATALOG and the name of yc.ur nearest ACA distributor.

Mail to: P.J. Box 865, Burlington, IA 52601 Phone: 319-753-1625


Replacement Delay Lines for More Than 500 Color TV Models

bC

19070 REYES AVENUE P. O. BOX 5825 . COMPTON, CALIFORNIA 90224

Write for Cross Reference.

BELL INDUSTRIES/J. W. Miller Division

megohms full scale. Other features are 10,000 megohm input impedance on 10 v DC. Eight ranges of DC current from 1 E,t,a DC to 1 a full scale. The unit is overload protected by a fuse.

ANTENNA PREAMPLIFIER 704

Gain of over five times its input level

ACM has added a Model AA37, An- tenna Preamplifier to its line. The unit has a 300 -ohm antenna input and a 75 - ohm output for use with MATV systems or in areas with high noise levels. The preamplifier boosts the signal at

the antenna where they are strongest and free from interference. The unit provides a gain of 16 dB or over five times the input level.

PORTABLE SOLDERING 705 IRON KIT Features pushbutton operation and is rechargeable overnight

General's Electric's Tube Products Dept is making available to independent service dealers a cordless, portable soldering iron kit. Offering high wattage performance at low power, the iron's "Iso-Tip" soldering tip construction eliminates electrical leakage, need for grounding and possibility of damage to highly sensitive electronic components. Ready for use in 3-5 seconds, the iron features pushbutton operation, built-in work and pilot light and is rechargeable overnight. The kit includes case, battery charger and one regular tip. Price is $19.95. ... for more details circle 103 on Reeder Service Card


FREE ALARM CATALOG Full line of professional burglar and fire alarm systems and supplies. 96 pages, 450 items. Off the shelf delivery, quantity prices. ": ZM mountain west alarm

4215 n. 16th st., phoenix, az. 85016


DISCOUNT TEST

EQUIPMENT SPECIALISTS

lh HICKOK

IVCol= Rea i -7 Ll illlî ill COMPLETE LINE OF ELECTRONIC SUPPLIES

ICC/Mullard & Raytheon Tubes Telematic Test Rigs

FREE CATALOG ONREQUEST

,..,ICSDHR

Radio Supply

558 Morris Ave., Tel: (212)

Bronx, 585-0330

Co., Inc.

N.Y. 10451

o

IEC-MULLARD

,

c 1r`s Et

TV 88 1l_ t MINIMUM 10

I POPULAR 6GH8

ORDER No. X 114

SEND CHECK WITH ORDER - WE PAY SHIPPING CHARGE

"WE SELL TO THE DEALER ONLY"

FREE BIG WHOLESALE CATALOG with thousands of money -saving audio,

electronic parts, test equipment and accessories.

FREE QUALITONE INDUSTRIES, INC.

117 Columbus Avenue, Tuckahoe, N. Y. 10707 I Please send FREE Catalog to:

Name

Address

City State/Zip

DEALER SHOWCASE Descriptions and specifications of the products in-

cluded in this department are provided by the man-

ufacturers. For additional information, circle the cor-

responding numbers on the Reader Service Card in

this issue.

4 -CHANNEL TURNTABLE 706

Completely equipped and priced at under $100

BSR has introduced the Model 431OX 4 -channel automatic turntable. The turntable comes completely equipped with a molded base with walnut trim, removable hinged tinted dust cover, and an Audio Technica AT -12S CD -4 magnetic Shibata diamond stylus cartridge and all necessary 4 -channel

cables. The unit comes completely assembled, adjusted and packed in a single carton. It also features a shielded anti -magnetic steel platter, stylus force adjustment, anti -skate control, viscous - damped cue/ pause control, jamproof tone arm with automatic arm lock.

COLOR TV 707

Features in -line picture tube and all solid-state modular chassis

A new 19 -inch color TV model that comes complete with super bright in -line picture tube, 100% solid-state modular chassis and matching swivel base has been added to the Magnavox

line. The unit, Model 4352, comes

complete with matching swivel base. Other features include 185 square inch picture, automatic fine tuning, automatic color, 70 detent UHF tuning and 13 detent VHF tuning, sharp- ness control and lighted channel indicator. Price is $449.95.

TROUBLED BY

TRIGGERED

SCOPES?

The Hickok Model 512 Dual Trace Oscilloscope eliminates the set-up and precision problems you've had to accept using other triggered scopes.

It's easy to set up Simplified color -coded front

panel controls. Beam finder quickly locates

off -scale traces. Foolproof triggering to 15 MHz.

It gives you superior performance 10 MHz response flat within

3dB. Excellent pulse response. Unique automatic VITS sync

separator.

Hickok industrial lab quality and construction Glass epoxy PC boards used throughout. Regulated power supply. Plus, our exclusive two-year warranty. Ask to see the Hickok Model 512 or single trace Model 511 at your Hickok distributor or contact us for more information.

$67500 complete with probes and accessories

HICKOK the value innovator INSTRUMENTATION & CONTROLS DIVISION THE HICKOK ELECTRICAL INSTRUMENT CO. 10514 Dupont Avenue Cleveland, Ohio 44108 (216) 541-B060 TWX: 810-421-8286


JANUARY


1975, ELECTRONIC TECHNICIAN/DEALER 47

CLASSIFIED RATES: 35¢ per word: 45¢ per word Bold Face Type. Add $3.00 if you wish Box Number. Minimum $10.00 charge. Classified Display Rate billed $40.00 per inch, 1 inch minimum.

For Sale

Television Service Business for Sale. In operation for nearly 25 years and we have more work than we can handle. We have several contract accounts which keep us very busy, plus a large following of regular customers. Call or write for particulars: Mr. Harry R. Johnson, VALLEY TV & APPLI- ANCE CENTER, 1252 North Main St., Salinas, CA 93901. (408) 449-7208.

ELECTRONIC ORGAN KITS, KEY- BOARDS for organs and synthesizers. Independent and divider organ tone generators, diode keying. 350 for catalog. DEVTRONIX ORGAN PROD- UCTS, Dept. A, 5872 Amapola Drive, San Jose, CA 95129.

LIQUID crystal. 31/2 digit wristwatch display. New, with instructions for building wristwatch. Final close-out. Less than original, factory wholesale price. $5.50 each. Two for $10.00. TRI - COUNTY WINSLOW, INC., Box 5885, Grand Central Station, New York, NY 10017.

For Sale: 72 sets of Sam's Photofact Schematics, 1218-1289. Make Offer. Contact: Mr. Wayne A. Frye, Route 2, Box 173, Edinburg, VA 22824.

LOW noise resistors -1/4W, 5%, carbon film from 10-3.3 Meg for 31/2¢ each. Fifty of one value for $1.25: 10% discount over $50.00. 750 postage/handling. Free samples and specifications. COMPONENTS CENTER E, Box 134, New York, NY 10038.

EVERYTHING you always wanted to know about service contracts, but didn't know who to ask. "THE SER- VICE CONTRACT COOKBOOK" only $15.00 postpaid when you ask NATESA, Dept. SC, 5908 S. Troy, Chicago, IL 60629.

For Sale

RCA -Solid -State Oscilloscope, type WO -505A __$175.00 RCA -Master Chro-Bar Generator, type WR -515A 100.00 RCA -Solid -State Master Voltomist, type WV -510A 90.00 RCA -Bias supply, type WG -307B 10.00 RCA -Marker Signalyst, type WR -525A 20.00 RCA -25 inch. CTC-24 color television, with brand-new Matrix

Picture Tube and flyback transformer, table model (no stand) 180.00 Jud Williams -Transistor Curve Tracer, Model A 90.00 Eico-Solid-State Signal Tracer, Model 150 35.00 Conar-Resistor-Capacitor Tester, Model 311 15.00 Conar-Communication Transmitter -Kit, assembled 15.00 Conar-Color Television Chassis, Model 600 with Cabinet,

less Picture Tube ____ 25.00 Sencore-Transistor FET Tester, Model TF17A 20.00 Electro -Transistor -Power Supply, Model -E3 0-24 @ 100 ma. .. 10.00 Kine-Color Circuit Analyzer, Model CA378 10.00

Contact: William D. Shevtchuk 1 Lois Avenue, Clifton, N.J. 07014. Phone: 201-471-3798

send a message... ...write here.

1. Number of insertions: (circle) 1 2 3 6 12 2. Start with (month) issue (Copy must be in by 1st of month preceding) 3. Amount enclosed: $ PAYMENT MUST ACCOMPANY ORDER WE'LL BILL RATED FIRMS NO AGENCY COMMISSION

NAME COMPANY

STREET

CITY STATE ZIP MAIL COPY FOR AD(S) TO: ROZ MARKHOUSE, Electronic Technician/Dealer, 757 Third Ave., New York, N.Y. 10017

L RATES: 35% per word; 45e per word Bold Face Type. Add $3.00 if you wish Box Number.

Minimum $10.00 charge. Classified Display Rate billed $40.00 per inch, 1 inch minimum.

ELECTRONIC TECHNICIAN/DEALER CLASSIFIED

FLYBACK checker, scope adaptor. Easy to operate. Removal from circuit not necessary. $10.95 postpaid. E. P. ELECTRONICS, 17 East El Vado, Tucson, AZ 85706.

LAKESIDE PICTURE TUBE RE - BUILDER -complete with many ex- tras, e.g., neck glass, bases, pump oil, practice stems, spark coil, face plates. $1500. FOB Oxon Hill, Md. (301) 292- 2070.

FREE CATALOG The 1974 Tucker Electronics Company Gen- eral Catalog includes 160 pages of electronic test instruments, 16 lines of low cost distributor products and thousands of recon- ditioned instruments

TUCKER ELECTRONICS COMPANY

P.O. Box 1050 Garland, Texas 75040

DYNACO-A-R, transistors, repairs - boards & units, speaker service. Send for prices and details: BEAR ELEC- TRONICS, 177-ET-Hillcrest Road, Mt. Vernon, NY 10552.

PRACTICAL applications of digital IC's. 100's of tips, circuits, projects on TTL. 443 pp. $19.95, money -back guarantee. GEA, P.O. Box 285, Northfield, OH 44067.

BUILD A SPACE-ACE7 TV CAMERA!! Only known solid-state camera available in kit loom or loamy assembled. Ideal for experimenters. industry, education, etc. Completely self- contained Connects to any TT set *lur

elreanon High quality performance backed by years of lab and field testing Fully Guar- anteed Easy -to -understand, oHp-py-step assembly manual Model 0T-10, Series 0 com-

!. delivery anyvwhere In tube only

Canada andPostpaid Optional audio subcarrur also available, 528.95.

PHONE or WRITE (or CATALOG...01AL 402-987-3771

BOX 453 -ET ATV Research oANOTA CITY NEBR. 68731

VISTA DIGITAL CROSSHATCH

For professional, accurate color T.V. convergence. Digital IC's coupled with a crystal timebase oscillator provide SYNC for precise horizontal and vertical lines. Accurate 8 x 7 crosshatch or 56 dot pattern. A.C. power 2 x 33/, x 6 in. Fits in tool kit completely assembled in U.S.A. $41.95. Ready to use. Include $2.00 for shipping and handling.

PHOTOLINE CORPORATION 118 EAST 28 STREET, NEW YORK, NY 10016

Antique radio tubes and Riders Man- uals for sale. Less than dealers' prices. G. C. Goodwin, 126 W. First Ave., Rankin, IL 60960.

T.V. shop close-out sale: Common Tubes 70% off list price. 20% off list price of Heath Kit Vectorscope, Mark- er/sweep generator, B & K CRT Test- er, Channel Master Field Strength Meter & other misc. items. Postage paid. For more information write: Ainsworth Communications, P. O. Box 23, Ainsworth, Nebr. 69210, or phone 1-402-387-1990.

Educational Courses REPAIR TV TUNERS -High Earn -


ings; Complete Course Details, 12 Re- pair Tricks, Many Plans, Two Lessons, all for $2. Refundable. Frank Bocek, Box 3236, Ent., Redding, CA 96001.

Wanted

WANTED -ELECTRONIC TECHNI- CIAN, UNUSUAL OPPORTUNITY FOR ONE WELL QUALIFIED IN COLOR TV. TOP SALES AND SER- VICE SHOP HAS 40 YEAR REPU- TATION. WE MUST REPLACE RE- TIRING PARTNERS. MUST BE HONEST, EAGER TO LEARN, AND ENJOY SERVING PEOPLE. CON- TACT: WELLS & LaHATTE, VICKS- BURG, MS. 39180.

COLLECTOR WANTS: Collections or dealer's stock of 78 rpm records -jazz, blues, country; 1925 to 1940. Also old comic books. Will travel. Dunner, 11 Golden Hills, Saugus, Mass. 01906.

Wanted: An extra instruction manual for Winston Electronics Corporation DYNAMIC SWEEP CIRCUIT ANA- LYZER Model 820, or the present address of the Winston Electronics Cor- poration of Philadelphia. Philip But- ler, Box 581, West Brookfield, MA 01585.

Wanted: Picture tube rebuilding equipment and supplies. Call or write: George Antimisiaris, 20 Coleville Road, Wayne, NJ 07470. (201) 839-4925.

BRAND NEW FROM ENDECO

the soldering iron with a light

Exclusive new safety light shows when power is on

MODEL 540S $10.95 NET

Two heats -20w and 40w -to handle any job On -off switch Cool, unbreakable polycar-

bonate handle Ironclad tips for longer life

Burn -resistant neoprene cord 8'/2" long,

2 oz Converts to a desoldering iron with

low cost attachment Also desoldering irons

and soldering/desoldering kits.

See your distributor or write ..

5127 EAST 65TH ST.

INDIANAPOLIS, INDIANA 46220 PHONE 317/251-1231

enterprise development corporation


/e/@Jjatic MJ-195

MASTER TEST RIG FOR TUBE AND SOLID STATE SERVICING

30 KV CAPACITY METAL CABINET SPEAKER BUILT IN

$149.95 less 19" picture tube

HIGH VOLTAGE METER STATIC CONVERGENCE FRONT PANEL CONNECTIONS

Ie/e/1/c1//C 2245 Pitkin Ave.,Brooklyn.N.Y.11207 FREE! Adaptor Quick Reference Chart


1,11"13r 8 ".13113.1& VALUE SALE

RAY., I.C.C., RCA, SYL.

FAMOUS MAKE, NEW JOBBER -BOXED TUBES 80% Off LIST

1B3 5 for $5.00 6HA5 5 for $4.80 1V2 5 for $3.00 6HB7 5 for $4.85 2AV2 5 for $3.95 D 6HQ5 5 for $6.35 3A3 5 for $5.05 6HV5 5 for $11.80 3AT2 5 for $4.90 6106 5 for $5.65 3GK5 5 for $4.85 61E6 5 for $11.15 3HA5 5 for $4.80 6166 5 for $9.30 3HM5 5 for $4.80 61118 5 for $5.55 4BZ6 5 for $4.70 6KA8 5 for $6.15

D 5GH8 5 for $5.90 6KE8 5 for $7.65 6AX4 5 for $5.05 6KM6 5 for $11.25

D 6AY3 5 for $5.05 D 6KN6 5 for $9.85 6BK4 5 for $9.35 6KT8 5 for $6.85 6CG3 5 for $4.95 6KZ6 5 for $5.15

D 6CG8 5 for $5.40 6LB6 5 for $10.75 6C13 5 for $4.70 6LQ6 5 for $11.15 6DQ6 5 for $6.75 8F07 5 for $3.75 6DW4 5 for $4.70 12BY7 5 for $4.50 6EA8 5 for $4.95 12GN7 5 for $7.00 6EH7 5 for $4.80 171Z8 5 for $4.50 6EJ7 5 for $4.50 21 GY5 5 for $6.30 6FQ7 5 for $3.75 23Z9 5 for $6.00 6GF7 5 for $6.65 31LQ6 5 for $10.15 6GH8 5 for $3.95 33GY7 5 for $8.05 6G17 5 for $3.40 36MC6 5 for $11.40 6GM6 5 for $5.25 38HE7 5 for $9.20 6GU7 5 for $5.25 38HK7 5 for $9.00 6GY6 5 for $4.35 42KN6 5 for $9.15 FREE -$100.00 LIST OF CONTROLS WITH ANY PURCHASE OF 100 TUBES LISTED ABOVE *A 6GH8 SPECIAL 100 for $59.00

TRANSISTORS XACT. REPLACEMENT (BOXED) Up To 90% off LIST

SK3004 5 for $1.90 SK3052 5 for $3.90 SK3009 5 for $3.90 SK3054 5 for $4.50 SK3010 5 for $2.10 SK3082 5 for $3.90 SK3018 5 for $2.25 SK3103 5 for $3.00 SK3021 5 for $3.15 SK3114 5 for $2.40 SK3024 5 for $3.30 SK3124 5 for $2.10 SK3025 5 for $4.50 D SK3132 5 for $2.60 SK3040 5 for $3.75 E ECG155 5 for $4.90 SK3041 5 for $4.20 ECG131 5 for $3.90 SK3042 5 for $6.60 HEP707 5 for 15.00

DIODES & RECTIFIERS RCA Damper Diode Equiv. To: RCA 120818 $1.95 RCA 135932 $2.95 ITT 6500 PIV Color Focus Rect .10 for $5.00 2.5 amp 1000 PIV IR170 20 for $3.00

100 for $11.00 YOKES & TUNERS

Tuner inc. 6GS7, 6HA5 $1.95 Combo Tuners inc. tubes $4.95

E Syl. Tuner 54-35055-4 inc. 3 transistors 2 for $15.00 Y105, Y94, Y130, 95-2874 ea. $6.95 Zen. Color Yoke 95-2532 repl $11.95 RCA Color Yoke 906214-501 $8.95 Syl. E01 51-29978-1 Color Yoke 2 for $15.00

RCA - ZENITH MODULES C 132581 $3.00

132579, 133455 ea. $3.49 9-50, 9-59, 9-79 ea. $3.95

AUDIO El 60 Min. Cassette Irish 6 for $2.50

84 Min. 8 -track Irish Tape 3 for $3.00 Equiv. Shure -N44, N75, N77, N91 ea. $2.95 Equiv. Pickering V15 ea. $2.95 BSR Cartridges-SX5M, SX1H, SC5M 4 for $5.00

Remote Mikes Min. Plug 4 for $6.00 Stereo Head Set Min. Plug 2 for $5.00 Stereo Head Sets ea. $3.95 .2 for $7.50

O Stereo Dual Mikes Ampex $5.95 Speaker Kit-incl. 2-4", 2-5", 2-4 x 6, 4-6" All 10 for $12.00

ANTENNA SUPPLIES I.F.D. C0.14 4 Set Coupler 10 for $10.00 72 ohm -300 ohm matching transformer 5 for $5.00

2 Set 72 ohm Coupler $2.00 4 Set 72 ohm Coupler $2.95 72 ohm UHF VHF Signal Splitter 10 for $7.50 59U F Connectors 100 for $10.00 JFD DCM101 All Channel Color Antenna ea. $9.95

GENERAL 19 & 25" 21" Color Boosters 3 for $11.95 Zen. VOLTAGE TRIPLER, 212-136 3 for $12.00

Li 117V -12V DC H.D. Transformer ea. $1.50 E Blue Lateral Magnets with P.R. 10 for $10.00

Jap.Phono arm incl. cartridge 10 for $5.00 Minimum Orders $50-F.O.B. Brooklyn, N.Y.

Catalogs $1 -Refundable upon your order C.O.D.-CASH ONLY

CT & T SALES CO.) 4802 AVENUE K

BROOKLYN, N. Y. 11234 Phone: (212) 241-5940



TQUH?

THEY HAVE TO BE. THEY'RE ENGINEERED TO PROTECT YOUR COSTLY COMPONENTS FROM A CIRCUIT OVERLOAD.

ALL our fuses are subjected to the most rigid tests before they become a WORKMAN Amp Fuse or Sans -A -Fuse°

The WORKMAN Sans -A -Fusel circuit breaker with amp fuse pins ) is so tough it may be reset time and time again and still maintain it's original reliability.

This is only possible because WORKMAN puts quality, reliability and performance into each of it's color coded Amp Fuses and Sans -A -Fuses® and both are tough as ( expletive deleted )!

%kkrkman ELECTRONIC PRODUCTS, INC. Subsidiary of IPM TECHNOLOGY INC.

BOX 3828SARASOTA, FLA. 33578

NOW, with a WEST COAST WAREHOUSE located at: P.O. Box 5218, 817 Douglas Avenue

Redwood City, California 94063 To better serve you.


READERS

SERVICE INDEX

ADVERTISER'S INDEX

101 Antenna Corp of America 46

102 B & K Division Dynascan Corp. 2

103 Bell Industries/J. W. Miller Division 46

104 Blonder -Tongue

Laboratories, Inc.

105 Book Club Tab Books

106 Eico Electronic Instruments Co.

108 Elenco Electronics, Inc. 44

107 Elin Mfg. Co. 45

109 Enterprise Development Corp. 49

110 Fluke Mfg., John 21

Fordham Radio Supply Co., Inc. 47

111 GC Electronics Co. 9

General Electric Co. 4

GTE Sylvania, Electronic

Components 1

113 Heath, Co., The 41

114 Hickok Electrical Instrument Co 47

115 International Rectifier Corp. 7

116 Jerrold Electronics Corp... Cover 3

117 Leader Instruments Corp. 10

118 Mountain West Alarm Supply Co 47

122 P. K. Neuses 43

120 Oelrich Publications 50

121 Oneida Electronic Mfg., Inc.. 43

123 PTS Electronics, Inc. Cover 2

124 Qualitone Industries, Inc. 47

125 RCA Electronic Instruments 24

RCA Electronic Components .. 8

128 Sprague Products Co. 5

131 T & T Sales Co. 49

127 Telematic Div., UXL Corp. 49

129 Triplett Corp. .. .. Cover 4

130 Tuner Service Corp. 13

132 Wayne Electronics 29

134 Weller-Xcelite Electronics Div. _ 42

Winegard Company 25

135 Workman Electronic

Products, Inc. 50

11

16-19

44

IT'S NO PUZZLE TO ORDER

OELRICH SERVICE FORMS FOR TV-RADIO & 2 WAY RADIO SERVICE LEGAL FORMS FOR CALIF, FLA, UTAH NOW AT YOUR PARTS JOBBER OR WRITE FOR CATALOG AM

OELRICH PUBLICATIONS 4040 N. NASHVILLE AVE. CHICAGO. ILLINOIS 60634 ... for more details circle 120 on Reader Service Card


Z

W V Ó -aa ___ WVa

-Q~ TO

ELECTRONIC TECHNICIAN/DEALER

COMPLETE MANUFACTURER S' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS

SCHEMATIC NO. SCHEMATIC NO.

AIRLINE 1564 QUASAR ELECTRONICS CORP.....1565 Color TV Model GAI -12925A Color TV Chassis ATS, CTS, TS -942

AIRLINE 1567 SYLVANIA 1566 TV Models GAI-11245A,B/GAI-11265A,B Color TV Chassis El 1-1

GENERAL ELECTRIC 1563 TV Chassis XA

á Z

Us CI. O v v \

o

f 1_e

N [W1LCffi

mW r-haO-Mtl

CraON * 1--4

CHASSIS LAYOUT

I

MwTY MAO NOOIMOelp MIN A0011011111TIwMLaIeEt *WM Ili AMVANAOfA 1M MO FORTS l2i ORTt 03410014711N INOI MT/ H UN p OP SiamYOMIiMY1MOt.If v MOatAIOOO PARTS Y 6m ION 001VIRMN»NO NT N M M Amu Or TMY .

VII OOE`'PIM 011 OIRIKºI cairn? smell TTN MM MATI' OMl1ACTf11NTTCt Aa N /v MV

I tMIF hpiETd

LJ. _.,L___

18V

L boo

r- - i

rmr 3ev

68 caó- _

r 55 L104 I

1 I n I

I tÓ J ^¡Sx vn I a2

1 ÓS il Lp1 W; L 6M 1t16v ipV see I

lb QS III 1 = I - L--- J IPY

#

TP.I

SooE SYNCED AT 1/2

Y04IXAL 1805.05,

A SCOPE SACCO AT 1/2

I10RMMAL CREOLE?.

+16 V

2.1

TOOV

1 REG.

GC

6

MIP

AMP

6, _

/ACC GATE

50v L T.P 2sä1 ä , n 1 12.6V 1KV ihr-

R0M 5.6M . I

_CIN CI1 1 .K5 / IL1 .IOvZ m1R

I

CTIT

1na

LIR \LUS:t ; '1 III Tia ^Ìp SbM '"Ì 2 4155 ` ' I

44.0

Mo 5 IÓ' T T G1021

I °O -13," CIS

Y Ar.

1 q; .1.... 1 4 b RIQ

6.4

t 4 RN3' rór I L> -- - r11o4

_ -- _ -

SCHEMATIC DIAGRAM

0116 i c12,

2T0

1A60P CRS

ppVV n ' ä2

SOv' 6W Mv 6 13}

R215

5V

006

0301 M100 OOTRR .NO

309

0306

LC11i I2109 COO Kv RIIO T22u1 230 ^^¡¡`` OVI 611

2sV V Ap[ 1 16V lE, AGC

1Á LE8 0TIERVASE NOTED

1.000 4.100,000 CAPACITORS LAIE TNM6 1.4.r. *

CRINCOORS LESS TIIW I.uI

VOLTAGE IEASD EMENT SAXE WOH A VT./ WITH RESPECT TO 064%6 G20.20. 800+10Eß SET COR NAIWL OPERATOR. LEASLAAENTS 34 VYh 120% AT MY AC LINE VOLTAGE.

Y V V. Z."

MOT 3004.1

120 V.

SUPPLY

420V Su1oL.

21

3.5

RIIT !9 M

EMITTER +OLLORG

OKI

CANCELLER

C.

-"*Y ,r:t3

20V

11

I0OM VERT. AGIO

11.51 N2, AM

ß2I2 ,TON

OX.

C2ß5 I

VERT. OSC

3, 0205

.1 4.

50V

+5,3

VERT.

0206

04V

r -

1563 GENERAL ELECTRIC TV Chassis XA

JANUARY 1975

.210+ CRT PRINTED BD.

.E' .133 RMO J J !V 1:i.{. zroM

RI . 1/2V

*AO TO

O 2 172

R12 6.6Mr

WM^M TP$ 4.51042 RR0 6AV " c135 C101' 109 CQS , 001 .00 CI32r ` " °- 2T 5G8 `RRS 1

t ; SY I T 33 I EK2+ '0 ºov

ro /

I

1 m,2 IC30 T 1\ , 10M2 730 C001ß431

1 \ S,° 1_

026. 3000 REAM

012111

21 R2* U

22011 IL°r .44; 4. VERI.2

1Y 2ß210tt

°20T .1.5

620 ATOA

6202

vn

045V

52

Rí52 50V

0012

ñ1

62

75 X rß04 T252

TERN. 6

tRió: , i +20v

30

*259 IN

19

.22V

M

.7-- 2W

MIR T M

2-500

~-4F ß2J] M

.(Ì011 4ß2q V ERT

50V I.SY 41221 I.IM

VERE ORDER

215

¡ ¡ 1 I I IISOv

J ILJI II.N 0251 \ Y255

02511 pp

R260 IF Ì 4.78

1=

xf / / SV v -v

.3 0252

11IIOR1. RTER

6223 HOD

V2

Ñ

OY

2* RL E `t20

3.4V

TO R13i

TO ICIg 625h PIN 5

22,1 120v R276

+210 SUPPLY

(]GI E2ß - Al

6284 6V

PP

120V

-447V

1252 5.600

1E6R,E IDAO

100

J L%^ 0

IiOv

82

160M ,Ty . :E=..

º13* 1.56

R231 AM

0211 VERT. ß50H(.

25v

VERT. pRrOT\ 6 0203

1e

MOM Y259

r --t unf ut I

.4 TC2I3

[R C21t I =

I

»W 'vTOYT v äv

291

5601

1z2M 2n tn

y21" Vt.

TO CRT

C2T0

C.1 2-7 C- v A t poov Y

IVI IVI

f22V

ROM iEAD SUPPLY

M V

SPRY

COPYRIGHT 1975 By ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET, DULUTH. MINNESOTA 55802

1564 AIRLINE Color TV Model GAI -12925A

JANUARY 1975

UHF 8+

AFC

ELECTRONIC i4 COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS

UHF IN

JV47

D C ROO O '

MIXER - INJECTION MIXER OUTPUT IF OUT B+25V TPi POINT TP4 COIL LV22 JV49 TP5 RF AGC

0 ec2°,2),*

VHF Tuner Top View

=PM zee..: I 983 Bese III V,MO Amo 2 IPA] Severn Deer., D 250

10101251PPVen 1031511 PP Vert IPWSIl 3 [eHeltP, 1,15Be,.

BV P P Vert I4V.`%r

1 Goa IP,n 51 Mun: O,lool 0612100 P P Mont AB

IP11511

,

. rrr

21 Iunel,onRPN and Rf16.22V 21 IP12R0AmP0u1out34Al 3 ¡P12ReAmPOVI1,131A1 24 911B0Amo0u1ou131C1 P.P Hon( IP0S21 MPCob,90VP Alice/ IPW521 mmCao,250VPPHoru r,lntdm.28OAPPHo,u

IP11S21 11%521

ADJ. LV44

LAP.. nillkn:D, 31AI6OAP PAM IPW521

IRA 821 AGC DELAY (THUMB -WHEEL)

A5

OL A2

Üb AUDrC PRE AMP TB20

lJ

o28 À.o. LA

1SOTlIF 2N0D IF

(RA83)1EEEE3 L82

07 O DELAY OO

AGC O¿ATE

1ST VIDEO

(RC64) COLOR KILLER

- LA39 11 03 O Q 3RD IF LA49

AGC ieAUST

LA54

TA 59

Q4 C 0601n SOUND IF AFC AMP p OB PPP DRIVER AGC AMP.

OSC LIMITER:By of l

)

030

0011 SYNC SEP.

LC16 PWS800

V 012 BURST AMP.

TC14

(RD38) REACTANCE ADJ.

TPD2 V 017

REACTANCE Q 010 2ND BAND PASS

016 % KILLER AMP

TC29 o 015

HORIZ. BLANKING

07013 R -Y DE MOD IST BAND PASS Q 020

Y DE MOO.

YD4 3 3 SBMHa CRYSTAL

019 G

3.58MHz 018 BUFFER Q

3.58MHr G021 OSC.

/ 1022 oOAUD1O UT PUT

V2 A&B

2ND VIDEO AMP

SYNC AMP.

QE ±:3-U

V4A,B&C R -Y AMPE clo G -Y AMP.

B Y AMP.

V3A&B

VIA&B HORIZ OSC.

21LUe VERT.OSC. CONTROL & ,/ VERT.OUTPUT HOIZPOSC.

VY FOCUSTAPS.¿Z .

NYFES lo oEEZECT/ON raff / HO

HIGH

VOLTAGE

LEAD

MH140

TRIPPLER

V6

TH18

HORIZONTAL

OUTPUT

TRANSFORMER

V5

34DK3

HORIZ. OUTPUT DAMPER

l®J FH5

.225 AMP F USE

38V P Mau 1111521 Conn0IV3AI 50.1 0111520

5 Ilate IRn 10 321150 Gee. lawPP V4eo I50VPPBelong Ven '0G I.321

VHF TUNER 94A463-2

7r,,11;;;;:711

isumU1111

tNE41

3

01IQ

1 41

:573712-

é

-111

t C9Ulf

Y 3111r

2 trroDaA

9140

ill-

C3--7I

578216 Cl

2tCvs 20

t VHF

GIRI

LYYK

Y1C1I--C79

Ja?

N41 N10 n

00

434 LY37

I

1045 ö 1 `- -- ----_J I( r nlá I

T...__-` MMO

Rll/ M4 , AR9 CY35 AVI I r 1.1-4 130¡ 1-4 I #11 I 1 11G 1510`1FC ¡y14 Aw{ $nt 1----- ----. -1.513 m1

I II II $ 3140'nIru Y11r

11AY11 ; e

C41 CY2 I T.0A eQ

I

I c011 I IwaE

asl.

I Ge-, U HFTU-N-E_R_

_9_4_A_4_62_-1 087300' ` 1.IYEc I/OFO(lONC1M7S(9Y/6(A0f(NP(5., IIt 4ru¡

//re.

031113E IEAO

I Cauenm 5,m Seg Im

101116VP1Ver111M11

26 Collector Hon, 81434110151 21 Bese Morn Blanker 10151 3311150,4 "2 1.211 500 P P 110,5 p11111

P 05 3311 IArn el Ho,u Orr

210V P PLHo,,, (P11521 `n%3015891 PNnr IP11S21

--1 34430 iñi51úw6, aq ao- CAtO

Cvil 1111

i°- 51 511

51C126 VHF OSC.

054

IM B Plate I1PII5encAmP1V2A1 9 B300IInoulRgPleI8V 10 B300V0PP1I6VPP

60V P P Ven I.521 PP Ven 'NN IPR521 ven II (P1521

28 ¡PCI.Bese.BurslAmP10121. 29 CorrectorOurs:l.mul0i:

6VPIMau 1130511 15V PHonr 1111511

II Hour Cnn%e,Vmce P,Ix II 4BPuMe IH 0 T Pro 21 32V

I501 Pm21129OA1Allure PPMont o, 0 10/101051

I51B171-12 578178-12 93c7T-I AFCDISC .

I0803oeol

0803 Aeo1 is . A101 1'" LIMITER Alq L 331.w/

40802 Y511.14/ un -cem NOS

L511--Ilcut TloaoTl000 n1 eo0 l000

o o

P 1117

711.141

57B21-8 VHF AFC

055

COT COI 1119 Me O00 m00 cV! CYI cr3 Col M00 ¡000 m

# Arl ~~ AHFi

O I s IrOurP9i rVa OAYi pP 1r1 p IA pR

CYN r1 J(!Na(/lM A 11 wCl V 1 I 20

IfS sur txll rersr

250 T I1500 ra 111 life AT TOP Of -2 111IE1 atuE

MUTED 1331 TO 1011I0 HATCH 051 101 IIAI CAI1

0-C Mall (O.rRf N ISSI

DD POIS KI rtw

225

7lI

111

sr unf u4[ F-240YxilDE

C

N ISI

PV49

TO TUNERS

AND FRONT

PANEL CONTROLS

Í

I

iiii 93159-I

UHF MIXER

OSC. ORES 57B21-5

UHF OSC.

93A63 -I UHF AFC DIODE

eo

3.f

RE54 RE56 RE55

VERT. VERT. VERT.

SIZE LIN. HOLD

re

R116

BLUE

SCREEN RFTT

CREEN

SCREEN

{rb

AFC Soll

CRI

1124 HORIZ.

R118 HOLD

RED

SCREEN ,

(

¡PIA

!ON S

rJ/ '

E[

578142-4 AFC AMP

1111 n 0801

2ce11 err 93077- ' 70 aos fill 4403 AFC DISC. 150ST 530

0407

cur 71

26K T:2

578141-4

1saIF

ÁkÓ ACC ,3.í60.5%U510 DEUT ,RA

11111

21

77 OK

C495 122

Ala

We

4/0 1/41

01411 0114_\ OIT o:

578131-12

err Ir 0152

1111t

121y 1120 1144

-O 13,Y 1107

41.1111

ID Coin's 354000, Bunn 10191 MP PHo,u &x 3 5041H,Bulle,10191 2 30 0 P

Hon, Em4er 354415,8,10, RI91 2 NP Alen( BIG.

0201n00216VPP Hau 11%911

Ç I 1120 2

T 11 C113.1000

A102,310 C10I .Me

5L.1/111 .Si 2ÌI61

2S 1101 I 103 115751Nt

220

PW5B0O

570141-4 2MDIf

IFI. CAR 02 -53

5% rte

cAR 1123

141 tie

311'1

A Aun 4310 = ACC PULSE

% CITI .CID III? fil 1,Iro 01

1M s4, i 93C64-1 roa

150 15001

0153 Ya // I

Ire le Lou RS 518136-12 HOT I215O 1119 I 21 5% ACC CATE

Lp,5% 10011 2L - 41 09 131 101 141 1115I

100,1/41 CCI_ III :

02 1/41

518136-12 ACC DELAY A C AMP

07 OR

104!' I/0C 4N0 S0(I(10! _ 2/1( 0000 Off r011dr(0. YICC(I NI COMM TO

M! SIN rY Mfg I/N( I INTERLOCK FUSE

N "li I821

11256 0A -OA

ORC.

STH21 Ixl.

LINE Ie11l..013 FILTER

IsOVAL

WIR! !Mr

K ail

SSa 11a

21 /11

(01(rNS

POWER /! PIS!

( 5 G941 1f[l id A;rK HSSO

SSS

.2151

1r0 0K

TH18 H.V. HORIZ .OUTPUT TRANSFORMER

21a

-IsJ 00000

FH5

PIN

PHASE

ADJ. ADJ

93842-T 9° REGT.

0011

93842-7 B REGT.

0015

CH11A 00110

101 J 103

11450

B

CI02 F

COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FORST STREET. DULUTH, MINNESOTA 55802

i. (i, 111r,R ÌIL 1

IB 1

11 B-110VNpp1011,41ve,1 ,: Can:, 44.

C11X 10201B2vPPflow N

Iwasu

13 Emd1e, PG, Gee1D9 1v

0P eonz (NISI

t,351MNa0x10181 32 Geode Bu,eGmeOncle 1 33 B250R,pp1e0025VPP IIVPP1 IA0 IX P,u 5II I9112 SOP PemuIPW511 Vert C11141

49 Bu,SI1eVIn,PVI5e1Nol PnIIIIVPPePn:

A

50 Vert Corre nce PO, 6V PP Vert o jun1051

93C71 -I SODNDDET ¡¡¡¡}}{n] 00

DOIS 1?

005 *,5t

uN

1111 111 101

041

578142-4 3 RD IF

Ir 03

I,

l,Il -i.4sr

A13s i 510,5t

I1"° 1.11

I/11_ 110

1131 1A41 101,5% /l

NI ',NV

01370000

1L s%

Coerlor IslBanawsfAmp 10131.IVPrBurs1 PPP [Noma Mont tPra511

34 PLC Pow 280P Plow P

IPWsn

15 261504e Blanae,UwJe

1X441 ºVP-PHmv PIS 11

e 112SOUNDf DRIVER ¡585-12 moan. 94 O5C LIMITER ,nrN

1, JlIJ eÌ /»' OS vr

JI I( ?

I

93064-I IIM0N0 v(cpo CLAMP = ,Ir 00

ON4- 11, 119-E49: T

SIJN o"0; _2,M% 220,1/11

11{ In, 3N, s%

930T7 -I 1_.01 aWI VIDEO DET nN

0459 1,0,5%

I}I

1451

0s1 LA51150,5%

057 50

5%

TAS! 1501a 110

l01' CA'! A 67 052 CAB{ a T'.01 6IÑIlSt -¡-1500 ?' 01

518145-12

uri *aZ BURST AMP

12 KIP 0D1 11m In py * 00 93064-1

//Jr

CCt 2200;

104 1.51 I/11

«s- aT

aro OQ 0011

Z.1 137 7.01

moo V, AILIER DET. 0014

r2C3l010` ÓI J1.5'

4Am CO 1001 93C64-4

co, °7{p KILLER DE1. Io00 I0t 0015

A612

111,5%

IA

Jlr

2OO ISO AM,

93611-1 750,0% RATIO DEI.

0110 DIOS

1114 L111 Ntti ~ Inr R@1 T 1CW 100 11 150,s%

330 160 CnO ' IOUP

IN11 _CIIS I C1IJ oln 1/411 St 1000 Isr ÎSQst 150,5% CIO

93C39-13 93Ç11 N - 114

CI t15tx- 171 -º = oigo 315 1111

cm r NKR REG .,. n r

1

..._ T n4 47 I

T

Lia -Y

IB EmmW 2rABanauessArno

10111 541041a 0 18v P Peuna

IPMII

19 E44114, B V Demoaulla 10201.07VPP110v IPW511 Emme, R10em0auwo, 10211 09V NP epna (40 11

38 Gn0 (Pen 61 vert 0,10,, 35 ,Imelrn211111%OV VIO, niel lwP PVm (Pull, BOV PP ven 1430571

518460-8 IST VIDEO AMP

010 JJrA

1461 UN Oro 12

1/47 IIr

AA{3 IMO CÌiI 11N

0110.1` $s% 4.111, 5% úi R 01 111(.00

1/11

16 Base 262 Bandpass 46,0

10141 [Noma 013V P hen/ i/ roes

IJ Co110104.2naBanapavAmp 10141.022V P Alec I40s11

ert Oulpul 1/ Ce100e1Pr491ver1 Ou1pu1 ivIBl 11500,101 140521 IvIBI 12VP PVer: 140921

Ani 1.51,5%

INt

un a T300o 3.1I,I41 sl/ 544 LtM;ev

n 10 4-13-- 5%

1053

!30#

110

1171

St_ i 4 UI D 1315 CIa 130,5% 201 net 04ÌI I/IIÌ 518131-12

+tl I0,vo - - SYNC SEPARATOR --31.

011

5í A

1

Cc151 ºoz

1%14

BURST

0n {10

1 nit 93C64 -I 100,IN1

A11 0011

105 WOO; MU4

tIsl N/O C RD9 A1 \y )1711 93C64 -I

led PHASE DET.

Mox. 1/411 1M

I COS

10 I. /Jr

578448-12 NORIA. BLANKING

013

A00 11211021 /4I

511 I.IA I7,5%I 1/It 1N1 TCtI!

1000 311

11,5% «sO- COR .I 002 -L--

I-(1nI MO t02

1000y3.,1

901 aoT .IN AD31

L 11,101

00215S

151j 1/4111_30,2

Z.22

0050

I!r 578150-12 REACTANCE

011

yns2 30 //v

I,

3 IIr CDS3- 0001 -

{ICl1 s% 5%

01Z 22100,01/4411k°0° 1/41?

AO

ADSS

Ili LNI

loso 101,1/10

1034,47

-«30 one a

300.5%

1/41

C0/2

0250 0% - µi0 016 13041~ 111141IM 110, I/41

Colo 3.S8MN4 CRYSTAL 'O' IJr +10,wo asr SO63 íí.i 200 á¡01y5 1/ít eAJr

//y-- CON St li 1( T 413 ? l { /n.st MY 1 CM1 .l roa AON CY Ir Bloss

I'° d0 5i10.5t 518143-12 518459-12 4` 1111 3. BMN4 BUFFER 300,5%

s% Nt Jr 3.5800X, ORO 1011

REACTANCE

lceis tt55 T1 93064.1 1500 ! B RST CATEDC T

518143-42 lOSS

IST BANDPASS 17

/u 013 IJr

VOLUME 1112 SOR RIP

et0 1134

la1 1601

d Ill IJI vii

20 Caere R V Demmulato, 10211. i SVP Nerd 140911

40 Gna1Pn101901009'121 95V P P Ves (PW521

1155 518153-9 4 I AUDIO PRE -AMP

06

1104 151

1/10

1123

0, 5nt v

ocsl 93064-I say Too, CLAMP =

BANDPASS 0052

027

uo Ilr 025

000

Ir I 2{ 5.3 ,1131

105/ Igo

"It

0071

518144-1> 2 NO BANDPAS

014

93C64 - BURST BLANK

OCl/

C0t3 1

Ct30

lo, leo INK

Ca 22

DO

C113

loots

C11s It55 01

1or IOOm 550,5%

A051f It COST 01 100

518146-12 47 I 2`7

COST ion 70 au A 1.0 £ 3.51DSi

COLOR AILLER AMP - 5t 1111

93039 -II - AEN R

AEG e 00 2

,AI

ADJ 10015 Ion.

IIC

018 019 014,1011/411 1/4i

0045, .1

T

1/6I 334, I/11

Cou rol

518159-12 B-TDEMODU ATOR

020 ¡Jr

041

1170 0q1/10

940

250

Íid

SYMBOL DESCRIPTION AIRLINE PART NO.

CH10A, B, C, D-300pí/350v, 3000/350v, 800/200v,

100/350v elect 67A15-415 CH14A,B-2000pf/40v, 2000pf/40v elect 67A15-413 RH150A, B -bleeder focus module 61A71-1 RA82-2K AGC delay 75A101-31 RA83-2K AGC 75A101-31 RC64-10K color kill 75A101-18 RE54-3.4M vert size RE55-100K vert hold 75A95-18 RE56-300K vert lin RH28-2K brite 75A140-25 RH29-3500 contrast 75A140-26 RH39-1K color 75A175-12 RH42-50K vol W/SH41 75A140-31 RH125-5M high volt adj 75A135-57 RH149-30M focus adj 75A108-8 LC16-coil chroma take-off 72A329-1 LD52-coil 1 *h, 3.58MHz output 73A55-37 LF24-coil horiz adj 94A351-1

20I I. "or

11144

AUDIO OUTPUT

MI/1/11 20CIl0/J

578192-10 AUDIO OUTPUT

022

tot

J ILL

01111

DELOS

LIRE

IO

PRE-SET

COLOR £twos 016 - Cil

COLOR Onq

N 110 -SET SELECTOR

511011 511211

SP I

0020101

5.2 0110 VOICE COIL

11IL14I u

LOT

SIO

01/3 120

Ir

AIRLINE Color TV Model GAI -1 2925A

MH57-deflect yoke 94A571-2 TA59-xformer, 4.5MHz trap 72A216-7 TB20-)(former ratio detect 72A318-1 TC14-xformer burst 72A325-3 TH2-xformer line choke 73A31-16 TH4-)(former power 80A108-14 TH18-xformer horiz output 79A169-3 TH44-xformer audio output 79A141-4 TH73-xformer vert output 79A365-1 FH5-fuse .225a chemical 84A28-12 FH27-fuse 2.25a chemical 84A28-16

tuner VHF 94A463-2

cur 1 i NOT IOrIlIIMNlIpIMMICbMIr/MIJA!!I I f3 °% 1/211AF9 a 10/00«1A

2ND VIDEO AMP . IlMIMOJK.JJIr ujr21/OAI I2 V2A lit AONOMV( TIPS

CG

0 COY 1247

ow-- far 121,21

I ! ±L et« r moor

NrlSOY

1/211A F9 SYNC AMP.

V28 11E3!

1 II I[IO 0080

550 1000

518178-12 COLOR SWITCHING

B* 025

11 58,51.

n 1o,6

tNl

J 578159-12 RI DEMODULATOR

021

Ulf 1,0

Low 10,5%

PWSI

o

01111

1000

1117

MOIL

075 o PRESET

N TIT 016 11101 II. sae

05 ,5% í100 Du cou,5t

I

rt1 ar -4 PIE -505 5(L001á

511101 011010

91

1.20 56 04 01100

01. Orr PRE - SIOI 411

911211 01010

18101

TINT

ÿ'0 ,;0

1J

1014

51,5%

AE47 11n 3{1 001,53.

5%

TPr2

woo aso SPARE CAP

01 004

LI. .01

Aro! fur 0100

Ua 8ACIOA

IPI%

1rll 1P1

IOI

tJ0tt : .{

Ir11ft ItlrJr

1/3 8AC10A ÌS G -Y AMP.

1043 2/014

V4B 10 tu,

--1F f _ Ir 1

R -Y AMP.

V4A

L051 2O0

117544 .MM PI.. CLOYI1,I/0Cvdt66

11

LAI

IO

/DIN n

rtl /OIIJ.IM crisi !f71 ZI. ro .,Z ma I.II/ro

REO I/Ir

X55 .01

1741 l'IC

1151 ' º11e, 211

ICU

AMY

It

13

r SAARI

1 CAP

2.30

1000,211

47IPS'

Ar52 APn IIEC IIEt

1480 0111

311,21 .a

LPN Arts 01,01 IIEC

file 50111

1157 "r

001

012

R -C RIGHT VERT.

BLU MORID

CONVERZEICE

120 CC15

93842-7

003

ICI 110

St so

ORIZ

C BAL

BLU f

31424 1.'

LAMP

1 ILL

BOTTOM VIEWS OF TRANSISTORS

11? 015110 CASE !rots

001 VERT.

013,

CLAMP

022

5041 151

PWS3

417

feat /100190

Cal Tea

0.1011 COLUCTOil

101001

0 Ha

ICI 300

103

..,'REDICRN TOP BLU

COILS 808tit

40

011001 1 IASI

SR 001001 00110011111 0 0111 S 601103

o

Lon "'" FILTER CHOKE

0001 C11101 11

DEGAUSSING

COIL

AC

C ET

1000 1(70

1000 IIV

10010.1

PWS2

8. REV

VERT OSC

VIA

1000

10

93097-1 00,

0E3 114

93091-1 BoRECT

VH OE RL TD 17091

110031

COI 022

tria 7:: 1E12 154 011

10g 1g170 20I CAW CE1771.

1 041 05 NIB

VERT OUTPUT 7 - on s it

11 110211,2 EC

Ofd2411 OC

DO

011151

100

AC 0

11334 0132

IMO _La, lib z i500 91 Z1500 110

124 1001

HOR11. PHASE 1111 1117

DETECTOR 1CR .ny

rji _tors 111.11. 1

011 120 -4, 0141 5%

1101 C11

111

13.3342 5%

.11

3101 5%

Inca

1,20

vz

VAC

072 t 150 )11 90

<132 02

6LX8 033 HORI/ OSC.

COO /54

V38 eat 1 1.111 1131

300

>1132 221

27 ,3.011

tg FM T5. HOLIZ ADJ

CAP

COP

1100,20

1011/011

SPAM 0301 GAP

0.111

1101050.I.3:, I 210 11-1

000r

42'221 1171 1177 5 112C 51104

BL E GR EN

SCRE N SCR EN SCREEN

OM PRESET

120 124 1201

11

11172

611 I

CC

1721 1 20,111 II

51100

11920

,00

PRESET BRIGHTNESS

111

21

11125 1)11 In CONTRAST toss

1421 01121 1204' 1011

BRIGHTNESS

1001 0102 1(2201 PP

1111

2.41

71 001

11117

36LW8 "1°

0olt. OUTPUT

01140 VOLTAGE

CPO 1111111

Nag 100.50 IN OU

Jet 0

1111,51

110

20,5.1

3400 DAMPER

50 VS

111 11: HuRlIONTAL

OUTPUT

POW MUSS geed! Sffell/11 OfSISMO« MIMS d11/10011,1011, WWII. CIIIMMIM r#74577 I a#11(111401/0 If. 44,911/14X1 #727712 art TM / AM /111/. 201/111.Ki 040115 Of 11.«. -4-/OPICAMS COMM PUMA Od /MUMS MIS PM SHAM I( 00414IM de MAMMO/11# MI Itd110 1171110 10/115 /00/tIll0 I ;035/1 MOM 1101 MAIM MI II WI AC /MI M- IMS Sf/ 10110W O4,10( 001153 OIMIMM apart, 10014101 0140/005 OM MOO MUNI 5110M. r/1/I CO 'OM Mt AI OY-

r1/011 teSMS IS COW«, 10 0/0113110 OM PM Of le MUM"! OM MI IMVITIOI 1110900011 IMI melt« TO 00/0 IM IOSMI/iff1 01 42470111411,1110/114 10011 I 040461 10 Mg fOMPO(01.

11415/3100 (101101 10 dr0/5 0,1411 10 1110MS'011. PO PO" MOM! COMM Ile P/C111111/1100 01300011110 100011433/5 MI011 00 AM IOU /11 MI MIN 10415/510.11M. (UMW Of MIPS 1110110 00 (430101010. PON/ MC110 11011'11,0 II POISMI MOON OISMIMM 100 doIM Mr 10 1/11011 elf 041 00 OM COMO 011 CIO/10110 MOW YCCIosool MIMI 11101(1 CMPO- ME IfIlladiS 0.010 [5451/5 C00000. 00 III 4111)1141M/Yf Mdl 1110dIMMOI !Me PO OM 01( .41000/0I110.041MI IN IIMMIPM OfdSOMMM 4.11110 011"00 MO 01111111

gin IN 001111/10104115 OMPUIPIMOOPIIII(0 II CIM1 OW UM NI OM« 45 ell II 011 101(100 MOM. Mk: /I 1147.10M(S MO/CIIE Mg IOW COIMC/1003. MIAOW 101011f7 !WWI oestirmei 0X01/015 COI0/10MS MO III« 0019705 011M11117114« Carl WI IIMEMMAIMMOACS

SIMI Of OOMPH

1.10011 100

01154 =.121I Del

33311

Hies N 10011.1101

RE

stuj

OUVTPRtir

PIN 10 .11141

INK 10,51

5101

01124

011

23

11111501

MCC

2 111151

3.0104

111101 1

501 52 ,391FC

PIN / 111411r6111

r la PI

210

COCO

ILII ILL 12 1114I

het 71121

P113 11111

OLLIRTION YOKE

MIN PRO 0 414

01125

FOCUS

COPYRIGHT 1975 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH, MINNESOTA 55802

1565 QUASAR Color TV Chassis ATS, CTS, TS -942

JANUARY 1975

UHF TUNER 0e

PICTURE LOW LIGHT ADJ

O INTENSITY HUE

O VERT HOLD BRITE

O TONE VIDEO EAK

ELECTRONIC /Fire= TECHNNAN/DEALER

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS

J

ON-OFF VOL

VHF INDICATOR LIGHT NO. 756

UHF INDICATOR LIGHT NO. 1866

LIGHT SENSOR (LDR)

SUPER I NSTA-MATIC SWITCH & INDICATOR AFT ON-OFF

VIVID

MANUAL PICTURE

SOFT CONTROL

O INT HUE

INSTA-MATIC PICTURE CONTROLS PICTURE

BRITE

TS -942 Front Panel

AFT S1 W1201

2,3V AGC 29Vp TO

SW901C

C1 CfOC3

-_-1=T

FOR AFT/SLUMBER SENTRY CIRCUIT ON REMOTE SETS, SEE "LN" PANEL

10 DISCRIMINATOR AFC (AFT)

1

t -{b. 7610h

2 Q5 All A1U EMITTER

+35V AFT AMP FOLLOWER

; TiI 1ST ü 2ND IFiAGC

I E

i I 1

§_JI I___ 1 l' i OOp91.T1GF-0-_ IDE ovM I 21 IF/ IF

I

L J - 14.

TUER

IF 8 AGC

139.7511112 L Tun 1 16 i 18

VIDEO

4 .:JAL

RE AGC DELAY ¡jv

R401 33K e R403 ISK AGC PULSE

+2w FRA

402 IK TERM 14

ON H.O.T. U5011

4.s1®.y 1 c

DET

QI A1U 3RD IF

Y5

9.20 i 7. OV+20V

40T PP 13

IF AMP 6

T

JAY 41.25101A TRAP

6V PP

Q301

BIE AUDIO OUT

A6J 4 5V 2ND VID AMP 7_

12 I OF -

13! TO REMOTE

FROM REMOTE = ,YC", 88

FORVC" MO98RE DETAIL,

SEE REMOTE SCHEMATIC

1301

1301

AUDIO FUSE PL301 ¡J301 6259 `

SPKR +I00J

IX7

+2001

1 ' 1302 1303

AUDIO OUT JACKS

fiV PP X

SPKR

SP301 lsn

R301 5K VOLUME

n.'102 TONE Io3 R302

-0.820 -I.12V

R605 500

VERT HOLD "-o. 9V 1VVI.

VA

11

05 P2S

SYNC SEP

N

-1.07V a

8601 2.7K

9

{ E16 - L A6J

SYNC INV

7330 I

+331

+ C601 I I 47014 + TO REMOTE - 'YC" 28

56K

33V

130V 29V

0605 +

2.2MI

1a 6

Ì

R603 39K F803 +95V +

TO REMOTE

'1'C" 3B

8°"--12F2-9-11- ARV PP V

cBo9 500MF

76V

5 12 T j j CS

HT Q4 j 03 I

A8Z A5F 1 PRE -DR IVER DR IVER

13

C602r 2.OV

C603J(.12

02

VERT 0117

g 4P.5V

VERT

8601 IOK

76V

R613 220K WW

BANKING

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH, MINNESOTA 55802

B

C

NOTE: R10I (L.D.R.) AND PIX LO LITE CONTROL R101 USED RIDI

IN S. I.M. (SUPER INSTA-MATIC) SETS ONLY

IN I.M. (INSTA -MAT ICI SETS R102 IS IOK, U

DOTTED LINES FOR CIRCUIT.

4.2V

SCQ5

P25

4_5V VID.

P 6.6ÓD D. MI

PEAKING 19.5V

+20J ,,Vet R901 10K1

SW901G

Di Q6 P2S S07

Pis SYNC NOISE AGC GATE

*107 l6 e GI G G9

MANUAL L. + PRE- R902

R903 SET 1LK

INTENSITY y6v -COLOR ó 1.2V 1

SYNCp7

__G/ 4L

wv Q8

A6H

PEAKING

I(

L.D.R.

SW9011E . *12V

4 8

+29/ PRE-SET

PIX ; R202 Ar 1OK IN

I.M. SETS

BANDPASS

B+

4Li4L a

5

COLOR AMPS

'Cl

Q2 1 ] 1

A6H !J { 666 4

8

COLOR PROCESSOR IC

P4-21

)

P4-35

1'3V PP

ACC\ DET&COLO

KILWI-f

COLOR NMP& GA I

CONI/

ACC

AUTO

INTENSITY

CIRCUIT _ 55- ----,

01 A6H

1

13 3.58MHZ C.W.

VIDEO GA IN

ENROMA

]A IN

HUE

RANGE

9

11

XTAL DRIVER

OSC/

- 15

LIMA HUE CONI 358MHz

8 ó 3.58MHZ T XTAL

12

r10

AC- C/CK Q3 A6H

SWITCH

DRIVER

+204 MA PIX

L R R103 {r.

° D23- 10K I

D3 I

SW901D *1_85V 1.8V

A- 2

\\ j

-- DFAIOD > 113 / r

9

Q9

A6H ABL

PRE-SET

PIX LO LITE

FROM REMOTE

"VC" 14B

+FOR BLANKING

FROM PIN I MANUAL Ill H.O.T. 05011

R201 10K

BRIGHT

! RANGE

9

116

.204

()IS A6H

IC2 -' COLOR

DEMODIC

15 - 12 -17J

SW901A *q.3 11 A2 . 3

MANUAL

R904 100K

f +20V

HUE

PRE-SET

R905 100K

VERT OUT

3.5V PP H Sv PP

Q4

A6H S -S

SWITCH

14

64a

1 B

1 013

PHASE

SHIFT

VERT & HOR IZ BLANK.ING

6V 1. 2V

FC A6H CO OR GATE

23V 24V

14 -or

P4-29 BLANKING HORIZ.

1 15 Q3 Q5 06 Q7 T1L -104 A3S P2S ASH BIV E2

HOR OSC BUFFER PRE DRIVER DRIVER

11

Q D1C I

HOR L _. PHASE

n P4-12

4

94V

HOR

HOLD1~

Q +333

10

+33V 04 +33V

20V REGULATOR

EI

QB

A6Z HOR IZ OUT

r- , 21 DV U01

50/-( +200V ' P4-19 R303

ßa l2K

6 L501 - ((J w dÒ O5 -b-- o+20V

1 20.6V =2550MF o -

VIDEO

DRIVE 'wt

RED SHIFT

204

011 A6H

VIDEO DR IVE

hO 14V

+2004

Q16 BIE

BLU

OUT

2034

B1É

RED OUT

- 12

+2N 4-2004 +A

+204

i

QUASAR Color TV Chassis ATS, CTS, TS -942

INSTA-MATIC SW SUPER INSTA -ANTIC SWITCH SHOWN IN MANUAL POSITION A, _B, C, -D_

SW901 I Al A2 0_311 12 CI C2 F3 01 i PRE-SET F--- Y ---- I r7 717 r7 r7 R202 El E2 E3 Fl F2 F3 Cl 0203 H1112 113

lOK

- 716 F3 - -I SW901F

BRIGHTNESS

11

E F G H

IMPORTANT NOTE: COMPONENTS WITHIN THE HEAVY DASHED LINES, CRT, HORIZONTAL PANEL AND POWER SUPPLY COMPONENTS THAT DIRECTLY AFFECT THE 8+ TO THE HORIZONTAL OUTPUT CIRCUITS, MUST BE REPLACED WITH IDENTICAL VALUES, TOLERANCE AND WORKING VOLTAGE TO MAINTAIN PRODUCT SAFETY AND )(RADIATION PROTECTION.

6.3V AC

1 14

I

ISGI 6

B

1

X

150v PP N

G

+33V SG5

1y 360V 400V 1400V

1 5

ce ¢

I I

I

11

i

VI CRT

28KV AT

ZERO BEAM T

SG7

RED J_ G2 G2 G2 , err er: skr__'-

SG6 SG4 I--_'

I

R2l1 R212 10M 4.7M

BLU GRÑ

Ar 2 _ J u R213,

'FOCUS 1'aM1

LAR C507 ,

- d

R22

7

*25V PP II + 55V

94V

P4-7 OV

500v PP

j L503

HOV. Z

SIZE

HQL IZ OUT

VERT.OUT

T501

12

13B

H.V. i .- IE

1 1 21

9 .1 a; 3 0l ól

C502 D501 ü02J

1S j .0221 ó liE Tg 21 vl al6

C5051.

2 al 15 PL62lásfi -101 4MF' Z

))P4.2 14 - pL61 ` s. 15 O Ri°F

1H6fi L THN- H -

E P4141. o 11 `'R504 100K 1 1111

H.V. RE

0502

H

4 Pte¡ TO "B C" PANEL PIN 1

601 d'

8

TO "SC" PANEL PIN 91ABL CKTRYI

P4-37

+IOW

il

5

,w P4-26

P

+904

P1-4 )

-) P1 -BI

I VERT DEFL.

I COILS s P1-71

I

.

P1 6

H. DEFOILS

R606

1601

o 1

2 o

I -

VERT

L601

VERT & HORÌZ PINCUSHION REACTOR

P1-2

P4-36

D503

+1004

CENTERING

10

2o0v PP N

HC 15 1 13

P11M 95241 1 - 4

i_

10 3sv91.1M1

6 in -410

VERT TO HC PANEL NOTE: ALL OFF PANEL CIRCUITS ARE SHOWN COMPLETE.

ALL PANEL SCHEMATICS ARE SIMPLIFIED TO SHOW

PANEL FUNCTIONS ONLY.

12v PP V

TO /II VERTICAL 2111

TO /13

GREEN

L BLOCK

CONVERGENCE ASSEMBLY

1101110MAL 7.511

BLUE

101ILO1TAL 7.611 TO de

TO/9

RED OM

TO/14T01MrAL>I.a

F

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

1566 SYLVANIA Color TV Chassis El 1-1

ELECTRONIC ioEiui i4X JANUARY 1975 COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS

EMI 17 .46 VPP

18 .68 VPP

19 .68 VPP

Horiz. Horiz. Horiz.

.64 VPP 13.5 VPP 41 350 VPP

Horiz. Horiz. Horiz.

111111MCOPT

O 1.5 VPP O 1.8 VPP O .56 VPP O 10.5 VPP Horiz. Horiz. Horiz. Horiz,

II111 UAI!

20 45 VPP 2.3 VPP 22 2.2 VPP 23 3 VPP

24 2 VPP

25 1.9 VPP Horiz. Horiz. Horiz. Horiz. Horiz. Horiz.

O 14 VPP O Horiz. 11 VPP Horiz.

5.6 VPP Horiz.

27 6.6 VPP Horiz.

34 VPP 25 VPP 50 VPP 5.2 VPP 4.8 VPP 26 VPP 25 VPP 14 VPP 42

Vert. 43 Vert. Horiz.

45 Vert. 46

Vert. 47 Vert. 48

Vert. 49 Vert.

TUNER CLUSTER/POWER SUPPLY (E11-4)

I ¡ .Ztr.

i

-o--o-

fur l[ll

01202 GxA13 . ér.trtl

tee

El:

a1

3

El

1,':°:;; Ei

are

MÑ 200

o

I EDI 0 ' Y+I2.,,. a; o

,<.

..IyrMz eyl ,',:.

riem

4332

n2,4 ',"NR

21200

aE

roe

ruxl wx ó0I lwrtcN

AT

o

aP ,a.,,,..

°a JxISö:rr L1°--

01214

401

11.

IOC

a<x ®

Irx+vx[RA

AM."

IBDlw. #i+aa.a

2.24:023e 'ï'

To r

r

23-2

r 002.33e02morm TA 22C 11ITC OA

113

.1001.

0213 REOCNIND

DETECTOR

'

1n., %,LxrCx

Ic, T' Itix riáën

%}`jj ;,'

!x

tl' -r11 aá -4-.0.2

AD

0203 TUNER AGC

1

INVERTER eso

0200 IST IF

i Hd

. Niisn 2213

22

Arr gre,

uov ntow

0100 SOUNDD

0.

r--111-1

0202

A`T,Bó!>rfR

0

2 12

:i.évif%itn

2.

..-° a r.wEr. Hf-

Ott

;v ME. ET NZ; x;vi,

¡ w. T T.T3LSN>;T°oéc..Gc - -><->ox.-

0302 VERT.2súla'aR

II.DV Nµl

" ° , ; .. '3. -

r°

L_r. . 1 ,. ` 0303

I 2°O I

.x SNORá

a.ii01ECT . .v L -

DIVIDE

15.7502.

OWR > Lyy Madl

NORIZD11ç3KR+ T Vó., ° w

® 2 .e.C4 ,: 1 u Vr.,T'°' T

,

NrdV MErI

fM

322

320 17114.2

013013 0RIZ.3VERT EMDIVIDER

0320

121. C)N 3. z;

22

Ati

E

1

K

L

N

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802

I rrr r

, IMº.:,

O 90 VPP O 120 VPP Horiz. Horiz.

MUM

O 130 VPP Horiz.

11111111511111 II .

5.2 VPP Horiz.

11 3.2 VPP 1.4 VPP Horiz. Horiz.

28 4.6 VPP 6.4 VPP 30 6.8 VPP 1.7 VPP 32 1 VPP 33 3.6 VPP

Horiz. Horiz. Horiz. Horiz. Horiz. Horiz. l 13

O

.48 VPP Horiz.

.7 VPP Horiz.

.4 VPP Horiz.

O 10VPP Horiz.

iäää

15 .33 VPP 16 .5 VPP Horiz. Horiz.

SYLVANIA Color TV Chassis E11-1

O36 VPP O 23 VPP O .55 VPP 36 Horiz. 37 Horiz. Horiz.

P9 50 Vert

PP 51 VZP 52 Vert.PP 53

2.2 Vert PP

1.3 Vert

PP 55

.2 VPP Vert. 56

.02 Vert

PP 57

Vey VPP O .06 Vert PP

:

0102 AGO

ORFVER

/2)P /02.M

1. : r"xA:.:

. ]AY I

x w -o ;

A00 o4 U1

r i

coos

0900 .j'º DELAY DRIVER

1,'

Z_ ..

WI

FG

0206 ATM. IF

RAI

00.

VIOEo=,ER

91

IC900 VIDEO M OCESSIN 1 c+0º

-1 OI '

01

xT

OSO. VERT DRIVER

(133 3v1

K V L

M

N

111,

M'> "' 133V

Firx MErp

0400,1

.1054.1 Lc]f . r

F1! x I lióó

izOn

New AUMVnaINYAY

V6L9AR9 OOOO+ + 611«MO «TIM.,,

so

TO 5C;6161

311000

O a]

0616.

I .54

tf -1%ig

Fio ..o

L-a` . ]

1.214.

594

IC600 COLOR CONTROL ßx0.

622

V1/1.1

Le 7

Iiï.IDAI

5601'

I] gl1!..! z H

6934

T isv

Fp] ú 1.24-»"-t-

".""="1..1..

402

Irs

1.1114

5.10 13,39, 4, sues

loon,

Tº

.12

2009_1'

%'ñ,

(402 Vio ANP

rP.Jn

I »a BLANKER INVERTER

0906

s. ¡":i -71.17-17;7;

w r1'o:. Are, BLANKER #

BUOAER

wsPrÑ.º'c'n'

»iT º

- , i a0

C.

If IxSºs _ º

x: ] riäii

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

93,1,. <ï=;; º. :

0600 CORONA

CONT. AMP

/l.Jn

Ilcut 01,1

O910 BREEN OUT

º5V0MP22

OK

0 2.613 NA »Owl

-TRANSISTOR BAºIO 641166031

15.35324.1

wAºAa '-`-(.` 13-340464

-

13-33161.2

-IC REY TOP 0IEW1-

r:\ OR p \ OR I (

ou. OVVVuu 111

\

4600.0

i\ COLL Q406

69 61 5v

2 6C

1567 AIRLINE TV Models GAI -1 1245A,B GAI-11265A,B

JANUARY 1975

MIXER OUTPUT

COIL L 15 1

MIXER INJECTION POINT TP I

ELECTRONIC L

[ /[ 7 fi TECHNICIAN/DEALER

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS AND TECHNICAL INFORMATION FOR 5 NEW SETS

IF O'JT J102 UHF IN J101

C105

1105

0101

21

1104

÷--4113-05-1

J

arato at IMO

lai

110

B+ UHF Bt RFAGC

Top View of VHF Tuner (94A433-2) Showing Test Point and Alignment Locations

VHF TUNER 944433-2 -=».. ar, r:./,

114x //i/ .//l 1011 510}1

Yq!

11

VHF AMP

0101

°

la, {i goo

1121

Ct f 1r 14 rl t6n

,Il/'a IAA aI Htara AAA l/t/H/IO. IHaYCYY/(/(r,a VOA Alf 1YN, rfrnlrlYf(MIA less ra//fn//N rfaJlM tlaI Of CMS atr r+11 r0 /5 IA »On. a/IIIr(r traft Hr WOO. AMA 9 arfr0l/ NIA, Ha()aS MIA IllHn, MIA !AAA /OtM1at/M/l1-Ilafrra,,nraIt ?5111l011 ISP'? *000/5

úrñ i irlziaJuaar/a a Isr IuanH are Hot /1(/111((5. POI In n Mra(S of aoBon NOW

SMInr MaI /(M/f )I(+ I/fr14-r/t1( Nar AMA! II Off- f alMlHf1/ 1414,11/ Ir AAA,/ r rY Wind Italia f Na/!0 MAE COMA I/ HI//Y/. 14t,lHJS a0 LMIHS/ CAMS Irtlllar. III Orafi ff1111/S Sanos OPUiTllC 701517/al aa IOW AIWA 111rMl AIM IAA r/Irtl/rY/Ir¡0 IOW Cif PAW rnn(/rs . I t MIS AC if /fr/ n///©_ QI¡/Irr I// MAMAS MANI SA la Irla( rIIYH. rH/ar10/ Arnie r0 op omit Id rtllDt2as M arar la IAA IIO TO rnYlifn1411. M Al rY11 Sir 01 ruY IIHIrOHL, la /L a(faf AMA a 14JI0lHO H¡ tart, ro AAA, K0/MA, SIM/ If WI AMAMI r(Mtllt 01 Is ro/r^1 AA,n, a ter u5( 14 000/+14r o+rY(rI I1 Hr/f/IIO'( I(15YIH1/. Of Y/Y/ a// IX litt //{H/, zt rafla,- 14 al0a/Yn Itra, alr/tl Of At COH1a5 ¡/ la ale/Mn lr /fMII Aft/ ro rarrc( arts. (I AMA., !OMANIA alSrHH, oar IOW MAMA b Iar cam AIN tlaw(/ to /I5 (oler a/CII( 5(rlln. III all0rn ! (r N(Y I rafWOO Ha((OCIX,f. r001 KAMAN Mill AAA, I a/It, IMAM AA n/If aap rI/Mlrr (rYInIH, r argAo AAA/ a rMf/r/a rafr 5rtrfr. AMA: HI /so(Ir/n )In2W(/ 1rI r(lrlf){ VA rlYa(I /fa 1IPYfl. 001a1./l/

o

CHASSIS IDENTIFICATION

MODEL CHASSIS

GAI -11246A T1L6-1A

GAI -112468 T1LB-2A

GAI -11266A T1L6-1A

GAI.112668 T1L6-2A

[131

M/l: rYI, AMA AMA, 45 eta.

.o.l

TE ANIMAL VIEWS OF

TRANSISTORS

TP1 (sl

EMITTER OF 0102

MIXER Ir OUT OUTPUT COIL. J102

L113

UMF IN

J101

Top View of VHF Tuner (94A434-2) Showing Test Point and Alignment Locations

VHF TUNER 944434-2e T1CNA3513

0xf (rs,rn, r 005101111 1024

0031,10,1

C612112211-

5111111',

1101

b

1

o TT

loll 1101

Ia1 011

C1011 21

lne p1 n pen 21

1103

L 1 J 1111 1401

L___J L_ -_J

Cou

000 E

51

11031

010

5.1

C104

11021 110ft

1 r% 1 I

11031 11030 1 .+sac` rccati

Q 0-- -0-- Ó -jo_ ?1 SIºYIt15`l-- CI11

C 11

VHF AMP 02

0501

6101

I

Glq

11051 11;

CIH IS

[III 2o,sx

fil VHF MIMER

l 1it no

ira1310

-^1 Í1w2 111u1s Iq6- _111Wi 7

211 - 4

tse11e

4IYYIC 1101 120

CIOt 1 s..' y

3000 wr I F: Yal:15av4I I I

CI11':1 1z

111.21 C 0000 s(llalrOW0pr s

n11 tur.nY 11505 uw

r-11

L--

110311

Iu11 5.61

rnt

11 Ills 01

6120

IFI_

I fr

cin

~ 5.6

}ÌI

0124

!'II 01111111

2132

[

R339 AGC DELAY

i le

E COO 0306 3e

e

L30í O B E E

0301

1T201

E

0406 B C

L202

0407 CdI

Eo:-1B

8

14

IC201

L302

ç-inc "

7

A 1 Q.

L201

Q

Q302 E 0303

C>

0405 8 E MCR402E e J (j,p

0403 B C

L305 VO

OO Q304

Yu CR301

O L306

E

Q404 C E I o E

R411

0408 VERTICAL SIZE

SAFETY NOTICE THE DESIGN OF THIS RECEIVER CONTAINS MARY CIRCUITS AND COMPONENTS

INCLUDED SPECIFICALLY FOR SAFETY PURPOSES. FOR CONTINUED PROTECTION,

NO CHANGES SHOULD BE MADE TO THE ORIGINAL DESIGN REPLACEMENT PARTS

MUST BE VERTICAL TO THOSE USED M THE ORIGINAL CIRCUIT SERVICE SHOULD

BE PERFORMED BY QUALIFIED PERSONNEL ONLY.

tr ÌiÌ1

578185-12 AGC DELAY

SOSA

Jr FIG1

01. AN

AGC DELAY 1331

131 0012 100

lao

cgra

U113 1660

-- UHF TUNER 944461-1 Lw'smr, sr-- 7

,^(* ----1 C?J 11 ulr {-t Faówrm2-i ---------?

2,

33 UHF HIKER 131511

H 'F4

USC.II Y I )57821-2 I

UHF OSC

1

nYJ 1w I Vol¡ Ya 5¡xnmlu

rall/aASrYla/t Pe Ara Air

1 1

UHF TUNER 94A465-1

F1 ur 11.E

}.ewr lin

TO (1Y. e - ii 1 11r IA COA

-i F eft

ImT I5A v1/ 105

221 HUM 61x0

131 I lo

57B21-5

I ------

o

i

i

i

1301 °111/1.

578139-4 IST IF

0301

frIIA

imi .0 41251xi

5t

éév0 wa

0012

x-31

ts

Fla

1301 0

1131

I6

5713139-4 578(38-4 ái' 1,o 2,, Iº 2ND IF pis 3RD IF sx no 0302 le,sv. 0703 r Ir r LJt lf t®

CR401

R342 AGC

L 310 45MHz TRAP

C B E 0401

CR601

CR 302

& 0 307

40305 CR602

0502 C

E

CR502

CR501

R407 VERTICAL HOLD

0 501

LU -i%

CR504

L L5ß1 HORIZONTAL HOLD

Top View of Chassis Showing Alignment Locations and Test Points

4561

0201

111!1}//10º 1

SÓY

Fi 1111011 YI(Y of i5110111(0151041 trr

rza

41 tJr (Jr wr Ú f

02Ó r

TN 0201

C21. 120,5x

411

15.0% 1203

} tsr

Il IY1 110

C101 00 2.104.

IFS

500 33 j!1 sr.

578184-12 SYNC SEP

0101

I2

7311

11111,

1,14 27

C3

I11,

51B191-12 éeä VIOODET ISI VIDEO 12,15

18C1 -I 030 11401 1301 1301

p121 _4121 'p 0322 M12

1066

57B191-12s Iy T 1ox

002

Clot

1

J

301

576185-12 1,5, t ACC CATS ses

lour

0301 iw sr

{1 4}

- mY J lY !ACC 1516 1511

uor 134

HFI7 sx

l.. Ed{7 :331

1/411

{

10111

11tr 1-10

Ir WIZ

6101_ . le0l

nu 4r

1/41

rrN, 10l

uu 3 x / x 104.

0Y L / .1406 ;IIY

Isly

PWS A8869-1

578192-10 ALM OUTPUT

0201

21Z

JY }01

L+'ásv 0ér 1111.:21

Y_ TO KU xdM elir .

3q Ie1- - tl L 112VBJP4

151N1 }.11 i4} t 2 I t11Y- II

M 1.irmivilloalorouT111884:

pm.N111t1R 2

}20 .22 SUOISCI

vo ïiéY ulr rrr tn nR' º' uº

0 13

5:01

t201 1,(glf 1.

11

1421

OMtFAST 1517

1ióá 124

1 5`t é7á T oú6WI`1r 578184-12

11/1 1B&D VERT. BLANKING

oou 040M

IF, sr

u

tiá 1 1 e2

Srr

Ox Sx 11l0 50 S/OYY

1

1W3y/ '

I IBRléxriEss -

niY rs1y 1- i

YEAT

Iwr XOlO

1.2rt

-1 0 I

Uq1

506 JH

VERT

SIZE

578191-12 VERT BUFFER

0103

ran 0005 111Y

L 0401 Paq -i i Cmi_ A aoW3

SYNC SR 11.Z..4(12 1.41 atrI sa1 1101

M º711 ;Aso! /

OUPLING ttl Sill»I-11M1

DSC vgi. 14.3 -1

1. ix IIt1 105 ' , 9ÌR ,,13,1;j1,4 -t.- Ip. -[106..01! ,,,.¡ II

t501 R It 4- rrr 210x. mr j u

111. IÓO-- m0 _/

1000 %0 1/111 1/11

578191-12 578191-12 VERT PRE'IRIVER VERT DRIVER

0101 0100 1411. ¡Ott

6402

1 oa Mß, iT 10.0.

te -7\V 471_1_1-a- 578185-12

-,,, 578191-12 HORliTI 1202

illr , 511 C505 UV 1.411

C42oT

IQI

DIOK Ir 01402

03110

114

PA: 576214-12 5, ma VERT OUTPUT

rEr 0106

Trn .022 022 51

578188-12

0403 1103

1415 1 II

1424

110

.047

VERT

502

Zmilf

57E1213 -11-F-) MAMA 401111 OUTPUT 1.0 2513.120

202(

2515.3101 251 201

1011

1514

di 1180 AIWA

ICTuRE

TUBE

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH, MINNESOTA 55802

Jim is one of the busiest antenna installers in Pennsylvania. He does work for 17 major appliance dealers. But the bulk of his antenna sales come from his own advertising, yellow page listings and word-of-mouth recommendations from satisfied customers.

JERROLD a GENERAL INSTRUMENT company

Jim doesn't try to be the cheapest - only the best. He stresses quality of workmanship plus quality of materials. With this philosophy and a lot of hard work, Action Sales has doubled sales volume each of the four years since Jim started the business.

"My reputation means everything to me," says Jim. "That's why I'm so delighted with the performance and durability of the Jerrold Super VU -Finder line. My customers aren't much interested in

the technical specifications. But, they do want excellent color quality without interference and no problems from their antenna. And that's what Super VU -Finder delivers."

For more information on the Super VU -Finder line, contact your local Jerrold Distrubutor or ..

JERROLD ELECTRONICS CORPORATION Distributor Sales Division P.O. Box 350 200 Witmer Road, Horsham, Pa. 19044

THE JERROLD

SUPER

VV- F INDER

IS THE FINEST: ANTENNA r,

EVER BUILT! g?

©1974 Jerrold Electronics, Inc.


The easyto -read 630 makes learning easy. The Model 630 V -O -M is priced at a thrifty $72.

The rugged, general purpose Triplett Model 630 is the kind of dependable V -O -M that both teachers and students appreciate. And for the same reasons the electronic and electrical maintenance professionals do. Uncompromising accuracy. Sturdy lightweight (only 3 lbs. with batteries). Simplified single switch operation holds errors to a minimum, and diode overload protection for the meter suspension movement reduces the chance of tester damage when mistakes do occur.

With long, clean scales covering 27 ranges in only four arcs, the Triplett Model 630 is remarkably easy -to -read.

It's packed with major features: 1. Diode overload -protected

suspension movement V -O -M; single range switch minimizes error.

2. 4 Ohmmeter range with 4.4 ohms center scale.

3. Simplified scale-only 4 arcs for all 27 ranges.

Sensitivity is 20,000 Ohms per Volt DC, 5000 Ohms per Volt AC. Accuracy is an excellent 2% on DC, and 3% on AC. Measures resistance to 100 megohms, with 6,000 Volt AC and DC capability. Handles DC microamperes 0-60, and DC milliamperes 0-120, both at 250 mV, and can read DC amperes 0-12.

Rugged black molded plastic case with removable black leather carrying strap. All this for just $72. Get the same convenience and operating advantages plus 11/2% DC accuracy and mirrored scale with the Triplett Model 630-A, priced at only $83.

For more information or a free demonstration, call your Triplett

distributor or sales representative. For he name of the representative nearest you, dial toll free (800) 645- 9200. New York State, call collect (516) 294-0990. Triplett Corporation, Bluffton, Ohio 45817.

TRIPLETT ALL YOU'LL EVER NEED IN V -O -M's.

Triplett. The easy readers. . for more details circle 129 on Reader Servile Card

Documents

JANUARY CENTS HARCOURT BRACE JOVANOVICH ......5V p -p 1 KHz calibration voltage. $450.00 B&K Model 1431 3" Triggered "Mini -Scope" As above, but 1/3 the size. $399.00 B&K Model 1403