NEW IN TV FOR '75 · SEPTEMBER 1974 75 CENTS ELECTRONIC TECHNICIAN/DEALER WORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCJLATION NEW IN TV FOR '75 ... TEL 504. 885-2349 MARYLAND: 1105

SEPTEMBER 1974 75 CENTS

ELECTRONICTECHNICIAN/DEALERWORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCJLATION

NEWIN TVFOR'75

SONY PHILCO

FRIW5593349P20 .AW 001753AL1 672 ASWILLIAM w FRISE7176 GALE RDATLAS

MI 44411

Precision Tuner Service 4(7,11Eninki now available near you

ALABAMA:524 32ND STREET SOUTHBIRMINGHAM, ALA. 35222TEL 205, 323 2657

CALIFORNIA-NORTH: CALIFORNIA-SOUTH: COLORADO: FLORIDA-NORTH: FLORIDA-SOUTH:4611 AUBURN BLVD. 511! UNIVERSITY AVE. 4958 ALLISON ST 1918 BLANDING BLVD 12934 NW. 715 AVE.SACRAMENTO, CALIF. 95841 SAN DIEGO, CALIF. 92105 ARVADA, COLO. 80001 JACKSONVILLE, FLA. 32210 MIAMI, FLA. 33163TFI 916 482 6220 TEL. 714, 2807070 TEL 303, 423 7080 TEL. 904, 389.9952 TEL. 305, 6859811

NOME OFFICE-INDIANA5233 S HWY 37BLOOMINGTON, IND. 47401TEL 812, 824.9331

KANSAS:3116 MERRIAM LNEKANSAS CITY, KANSAS 66113TEL 913, 8311222

TEXAS-EAST::324-26 TELEPHONE RDIOUSTON. TEX. 770321E1 713, 6446793

TEXAS-NORTH.MOPAC LANEONGVIEW, TEL 75601

TEL 214, 7534334

TENNESSEE:3614 LAMAR AVE.MEMPHIS, TN. 38118TEE, 901, 3651918

PENNSYLVANIA --WEST257 RIVERVIEW AVE. V.

PITTSBURGH. PA. 1520.TEL. 412, 7617648

PENNSYLVANIA-UST1921 S. 70th STPHILADELPHIA, PA. 19142TEL 215, 724-0999

OREGON:5220 N E SANDY BLVDPORTLAND. OREGON 97213TEL 503, 282 9636

.. new pts products ... stop ... new 1974-1975 tuner replacement guide andparts catalog no. 4 ... stop ... 96 pagesof top tuner information ... stop ...

. . blow-ups of all types of vhf and uhftuners for easy parts identification .... .. stop ... largest exact tuner replace-ment guide available in the industry... stop ... antenna coil replacement

guide ... stop ... multifit replacementtuner shaft guide ... stop ...

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

order ... stop ...pts elex .

OKLAHOMA:3007 N MAYOKLAHOMA CITY. OKLA. 73106TEL 405, 9472013

OHIO-SOUTH:US TUNER SERVICE8180 VINE ST.CINCINNATI, OHIO 45215TEL 513. 821.2298

OHIO-NORTH:5682 STATE RD.

CLEVELAND, OHIO 44134TEL 216, 8454480

re

NORTH CAROLINA:724 SIEGLE AVECHARLOTTE, N.C. 28205TEL 704, 332.8007

N.Y. CITY-NEW JERSEY:158 MARKET STE PATERSON. N.J. 07407

TEL 201, 791.6380

NEW YORK993 SYCAMORE ST.BUFFALO. N.Y. 14212TEL. 716, 8914935

LOUISIANA:2914 WYTCHWOOD DR.METAIRIE. LOUISIANA 7003TEL 504. 885-2349

MARYLAND:1105 SPRING ST.SILVER SPRING, MD. 20910TEL 301, 5650025

MASSACHUSETTS:191 CHESTNUT ST.SPRINGFIELD. MASS. °II',TEL 413, 734.2737

MICHIGAN.13709 WEST 8 MILE RDDETROIT. MI. 48235TEL 313, 862.1783

MINNESOTA:815 WEST LAKE ST.

MINNEAPOLIS. MINN. 55403TEL 612, 824-2333

MISSOURI8456 PAGE BLVDST LOUIS. MO. 63130TEL 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 electronicaily tuned-detent UHF. 8 hour service is a must!

=Fast 8 hr. Service!

We offer you finer, faster

PrecisionTuner Service

..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 EQUIPMENTcondition.

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

1 YEAR GUARANTEE

ELECTRONICS, INC....

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

Major parts and shippingcharged at cost.

(Dealer net!)Over 4000 exact tuner replace-ments available for S14.95 up

(new or rebuilt)

...Number ONE and still trying harder!(Not a Franchise Company)

... for more details circle 125 on Reader Service Card

Think of him as a 250 lb.antenna.We know you don't have a 250Ib.antenna.

But when the winds get rough,you need every bit of turningpower an antenna rotor canmuster. The new, super powerBlonder -Tongue ULTRAMATIC1000 gets the antenna to theprecise point for each station,consistently, accurately.

And. by doing this, it givesthe best reception by assuringghost -free color receptionand minimum multipath stereo,distortion.

These exclusive features makeit all possible:

Highest starting and runningtorque (175 to 200/inch lbs.)-motor uses filtered DC powersupply.

Accurate 2 -degree resetting-push -to -start silent control:unique direction sensing circuitutilizing five wire control cable:differential servo sensing amp-lifier with solid-state switching:hermetically -sealed power relayautomatically disconnects rotorwhen not in use.

Reliability-weatherproofterminals use foam -filled pad:long -life. self -lubricated Celcongears: bronze worm gear andhigh strength sintered steel ringgear lock antenna in position:corrosion -proof cast aluminumhousing: fully protected againstlighting and power surges: un-breakable plastic control box.

Install the ULTRAMATIC 1000.it performs well under the mostadverse conditions and willstand up for years and years.

Blonder -Tongue Laboratories,Inc., One Jake Brown Road,Old Bridge, N.J. 08857.

ISEBrionder-Tongue

U ltramatic 1000use

Blonder -Tongue Ultramatic 1000 Seamless stainless steel

thrust bearings tested for350 -lb. load (no externalthrust bearings required).

Extra strong space ageCelcon gears-no lubri-cation needed.

Short circuit proof -shortsand/or grounding of termi-nals will not burn out unit-even on initial installation.

Built-in strain relief andweather seal gasket

Uses 5 -wire control cablefor true servo -controlled2° accuracy.

Naval bronze worm gear forhigh strength positive drive.

Epoxy -sealed potentio-meter assembly for unsur-passed repeatability andextra long operating life.

Phosphor bronze contactassembly for high accuracy,superior dependability. andlong wear -free operation.

Rock steady, lifetimedirection indicator circuit.

Temperaturized for opera-tion from -30° F to+ 140° F.

Unbreakable Control BoxDecorator styled control box is designed with ease -of-operation in mind. Simply turn the control knob andpress it. the antenna automatically turns to the direc-tion selected. The control dial is illuminated duringoperation and is extinguished when the antennareaches the selected position. Channel markers areprovided to mark the location of TV and FM stations onthe dial.

Installation InformationMast diameters up to 11/2 inches can be accommodated.Mast and control units are connected together withfive conductor cable and can be separated by as muchas 500 feet when 18 gauge wire is used. Twenty gaugewire can be used for distances up to 200 feet.

Mechanical Specifications

MAST UNITHousing: die cast aluminumWeight: 4.5 lbs.Hardware: Rust resistant mast -

mountingCONTROL UNITHousing: Beige and brown high

impact polystyrere, withbrushed gold compass face

Weight: 2 lbs.

Electrical Specifications

Power Requirement: 117 VAC, 0.3ATransistor and diode complement:

Two transistors, six diodes,two SCR's

Current on cable between mastand control units: 1.0 amp,maximum

DUAL FILTER CAPACI-TORS ASSURE PUREDC TO MOTOR FORHIGHEST TORQUEAND SMOOTHEST

HERMETICALLY OPERATIONSEALED REED SWITCHFOR ULTRA RELIABLEAC LINE SWITCHINGAND HIGH RELIABILITY

HIGH RELIABILITYELECTRONIC SWITCH-ING CONTROLSMOTOR ROTATION ANDDIRECTION NO FAIL-URE PHONE RELAY-

PUSH TO STARTSWITCH FOR POSITIVECONTROL

47731onder-Tongue Laboratories, Inc. One Jake Brown Road. Old Bridge, N.J. 08857

OVERSIZE POWERTRANSFORMER FORADEQUATE MOTORPOWER UNDER ALLOPERATING CONDI-TIONS

Sc it iU ,TATE DIFFERENTIAL AMPLIFIERFOR HIGH ACCURACYPOSITIONING ANDPRECISION REPEAT-ABILITY

You know the EIA guidelines. Replacelike with like.

That used to mean that all ycu couldoffer in "XR" glass tubes were the all -new,more expensive types.

Now, Sylvania has changed all that.We've added 19 of the "XR" glass types

to our Color Screen 85 economy line, andanother 5 types to our medium price ColorBright 85® RE line. You can tell them by the

"V" designatioi n tie type number. For ex-ample 23 VANF22. And of course, you've gotall types in our Color Bright 85® "XR" newtube replacement line.

Three lines -o offer. Three prices to offer.That should eliminate a lot of your cus-

tomer's inhibitions.Electronic Components Group, GTE

Sylvania, 100 First Avenue, Waltham, Mass.02154.

Another first from the leaderOD SYLVANIA

J. W. PHIPPSEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4839

TOM GRENEYPublishing Director

JOSEPH ZAUHARManaging Editor

DEBRA BOOTHProduction Manager

JOHN PASZAKGraphic Design

LILLIE PEARSONCirculation Fulfillment

GENE BAILEYManager, Reader Services

MANAGERS

DAVE HAGELIN43 East Ohio StreetChicago, III. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530

CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

ELECTRONICTECHNICIAN/DEALERSEPTEMBER 1974 VOLUME 96 NUMBER 9

FEATURES

16 NEW IN COLOR TV FOR 1975-Part 1

First of a three-part series which acquaints ET/D readers with the features andsignificant new technology in recently introduced 1975 color TV receivers. An analy-

sis of chassis types, models, screen sizes and general features are presented in

Part 1. By Joseph Zauhar.

28 MODERN SERVICING TECHNIQUES-Trcubleshooting Solid -State TV Power

Supplies and Regulator Circuits

Tips about troubleshooting and replacing fuses, circuit breakers, varistors and

thermistors, rectifiers, electrolytics and higi-voltage regulators. By B. B. Dee.

32 SQUARE -WAVE TESTING OF AUDIO AMPLIFIERS

Using a sine/square-wave generator and scope to track down sources of distortion

in audio amplifiers. By Jack Hobbs.

38 INTERPRETING MATV AMPLIFIER SPECS

Explanations of specifications which are important to technicians and dealers. By

James E. Kluge, Technical Editor, Winegard company.

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

Features, specifications and analysis of the functions of the operating controls of

this new dual -trace, triggered -sweep, DC -15 MHz scope. By J. W. Phipps.

TEKFAX_Admiral Ch. 3K19, General Electric Ch. T-6, Sony Models KV-5000 and

KV-1500 and Zenith Ch. 16EB 12X, ZX.

DEPARTMENTS

6 NEWS OF THE INDUSTRY 48 NEW PRODUCTS

8 READERS' AID 52 DEALER SHOWCASE

12 TECHNICAL LITERATURE 60 ADVERTISERS' INDEX

14 TECHNICAL DIGEST 67 READER SERVICE

15 ELECTRONIC ASSOCIATION DIGEST

MI A HARCOURT BRACE JOVANOVICH PUBLICATION ...it. ATINIP 1,11,7

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, VicePresident; James Gherna, 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 EastOhio 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: 75C in the U.S.and Canada; all other countries $2. Second class postage paid at Duluth, Minnesota 55806 andat additional mailing offices. Copyright (,/ 1974 by Harcourt Brace Jovanovich, Inc. All rightsreserved. No part of this publication may be reproduced or transmitted in any form or by anymeans, electronic or mechanical, including photocopy, recording, or any information storage andretrieval system, without permission in writing from the publisher.

POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P.O. Box 6016, Duluth,Minnesota 55806.

4 ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

The newMalloryCA3 Intrusion Alarm.

Standby, instant anddelay alarm settings. connection.

Outlet for remotelamp, bell, horn orsiren-energizedwhen detectionoccurs.

OunuO120 VAC 3 AMP

Reliable.Remote on/off lockswitch

Panic buttonconnections.

On/off switch for built-intwo -minute horn.

Closed circuit wiredperimeter connection.

111111Nibp,Aii031 1:0 k

NOUN ON

a tY kit-

04 4 4 aOIL .1,0 "

t

(And inconspicuous.)This area -and -perimeter device creates and trans-mits an ultrasonic wavelength field for detection upto a distance of 20 feet. And because of its moderndesign and walnut -grain finish, the CA3 is attractiveand inconspicuous enough to pass as a radio orstereo tuner.

Virtually any movement by an intruder (or a breakin the perimeter circuit) activates the built-in -tornand the remote outlet for two minutes. An automatic

MALLORYBatteries

Knob control forslow or fastresponse tomovement.

reset iandles the possibility of a new or renewedintrusion. And special CA3 circuitry guards againstfalse alarms from lire transients and insects. Avariety of companion indoor or outdoor accessorydevices is available.

The Mallory CA3 Ultrasonic Intrusion Alarm.From the manufacturer of the most complete lineof do- t -yourself security products. Another soundreason to see your Mallory distributor today.

MALLORY DISTRIBUTOR PRODUCTS COMPANY11 division of P. R. MALLORY & CO. INC.Box 1284. Indianapolis. Indiana 40206: Telephone: 317-201.1501

Capacitors Controls Security Products DURATAPE Resistors Semiconductors SONALERT- Switches Timing Deuces and Motors

DURACELL" DURATAPE" and SONALERT' are registered tradernad.s of P R Mallory A Co Inc.

. . for more details circle 123 on Reader Service Card

SEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER

NEWS OF THE INDUSTRY

NATESA's Executive Director Blasts Warranty Lengths and RatesFrank Moch, executive director of the National Alliance of Television and Electronic

Service Associations (NATESA), in a speech to conventioning members of the FloridaElectronic Service Association in Miami on June 22, voiced strong disapproval of thelength of consumer electronic warranties and the service labor rates paid by manufac-turers for in -warranty servicing.

In his argument for shorter warranty periods, Moch said, "Studies reveal that TVsets, for instance, are used on the average of at least 500 hours in 90 days, and thisshould be adequate to reveal inherent problems, and only sets of questionable qualityneed longer warranties."

Citing reasons for "more realistic" warranty service labor rates, Moch said, "A basicfallacy of warranty purveyors is that they are entitled to special rates that ignore fullycosts of doing business. Warranties at least imply that service will be performed bycapable craftsmen. How then can rates, based on hourly wages of $2 to $3, be justifiedwhen routine glass installers, for instance, are getting $9 plus per hour?

"Since service businesses must compete with other employers for manpower, anyoneworthy of being called a technician should expect rock bottom (pay) of $5 per hour,and well qualified technicians are worth $7.50 and up. Under rule of thumb, such(technician) wages project to $15.00 to $30.00 per hour at retail."

Color TV Sales to Dealers Up in June after SluggishSales During First Five Months of 1974

Total market sales of color TV to dealers in June of this year were 3 percent oversales in the same month in 1973, according to statistics compiled and released recentlyby the Marketing Services Department of the Electronic Industries Association (EIA).

This comparative increase followed a sluggish five -month (Jan. -May) period duringwhich total color TV sales were down 7 percent compared to sales during the first fivemonths of 1973.

RCA Increases Receiving Tube Prices

RCA Electronics Components has increased the prices of its entertainment and in-dustrial receiving tubes marked principally for replacement applications.

The increases, which became effective on August 1, average 3.3 percent for enter-tainment tubes and 13 percent for industrial types.

GTE Sylvania to Increase Prices of Color CRT'sThe Electronic Components Group of GTE Sylvania has announced that it will raise

the prices of replacement color TV picture tubes, effective Sept. 16.The price increase of $5.50 per tube is the result of rising costs of labor and ma-

terials, according to a GTE Sylvania spokesman. Prices of black -and -white picturetubes are not affected.

American Home Magazine Advocates Mandatory Licensing ofTV and Appliance TechniciansAmerican Home magazine, in an editorial in the August issue, advocated mandatorystate licensing of appliance, TV and radio technicians throughout the country.

"Something radical must be done to assure that your repair dollars are being wellspent-and that when incompetency or fraud is suspected, your complaints, if justified,can quickly turn into legal action," asserted the editorial.

The following requirements for licensing were suggested by American Home:"A service dealer would have to demonstrate competency, submit to an inspection

of his facilities, post bond (against possible litigation), pay an annual fee and adhereto standards set by an advisory board (probably representing the consumer interests aswell as the appliance and electronic repair industry).

"Also, the repairman would be required to provide a written estimate of the cost oflabor and parts, if the customer requested it, and not exceed that estimate without thecustomer's permission. When the job is completed, the repairman would have to issuean itemized invoice describing all work performed and parts installed, and return re-placed parts to the customer.

"The service dealer would be subject to stiff fines and the suspension or revocationof his license, if found guilty of negligence or fraud," the editorial stated.


Rip 'em off and save 'em up. Now the "Waltham" address tabs on ourentertainment receiving tube boxes are exchangeable for valuable awards.

Eee your Sylvania distributor for details. Or write now to SylvaniaSAV-A- TAB Program, Sylvania Award Heac quarters, P.O. Box 1000, Fenton,Missouri 63026.

CED SYLVANIA

SEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER 7

LEADER.outduals

Compact, economical, solidstate accuracy. For prod'n,field maintenance, qualitycontrol, lab, design & testing.Features - 15MHz bandwidth Trig. & auto. sweep -

from 100 nanosec cm(10X mag.) to 0.5sec cm,17 steps calibr'd.

AC DC coupling per than. Separate or simultaneous

sweep display of ch 1 & 2alternating, chopped, algebraically added

& vector (X -Y). 10mVp-p cm vert sensitivity. Cont. scale illumination wiront panel control. 73.CH x 971"W x 15"D, 14 lbs.

LEADERINSTRUMENTS CORP.

a

LBO -5055" DUAL TRDUATR

O

et*

$669.95

1

With probes,adapters, leads.

"Put us to the test"

151 Dupont St., Plainview, L.I., N.Y. 11803 (516) 8229300


WAHL

QUICK CHARGECORDLESS SOLDERING IRONWe couldn't make the best better.So we made it three times faster.Our original 'Iso-Tip' had all the features that peopleneed: complete portability; soldering heat in 5 seconds; upto 125 electronic joints or more per charge; battery oper-ated to eliminate AC leakage and the need for grounding;and "lock off" switch to prevent accidental heating. Com-plete with separate 'drop in' recharging stand.

We use premium quality nickel cadmium batteriesthat recharge in 1/3 the time of the standard Wahliron - one to two hours for a partially dischargedunit, four and a half hours for completely dis-charged battery. It still gives tip performance upto 50 watts and over 700° temperature.So don't think of our new orange "Quick Charge"cordless soldering iron as a better iron. It's alreadythe hest. It's just three times faster.

WAHL CLIPPER CORPORATIONSterling, Illinois 61081.815-625-6525

"Manufacturing Excellence Since 1919"

glts.


8 I ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

READERS' AID

Space contributed to help serve thepersonal needs of you, our readers.

Business for SaleComplete electronic service busi-

ness with great opportunity for ex-pansion. Complete Sams Photofactsand a number of test instruments.Please write for details.LARRY'S ELECTRONICS407 Elm StreetShelbyville, Tn. 37160

Well equipped TV shop with goodbusiness. Large home on the samelot for sale or lease with beauty shopattached. Must sell due to age andhealth. Write for details.BEN'S TV SERVICE4030 Nile St.Bakersfield, Ca. 93306

Schematic NeededSchematic for a Musicall Intercom

System, Model 999.P. D. LUND291 E. Arrow HwyUpland, Ca. 91786

Schematic for Japanese 12 -inch,all -solid-state TV, brand name: SunMark Model SM-12-TV (SM12-TV).S. M. PEARLMAN25 Wolcott RoadLynn, Mass. 01902

For SaleRiders TV Manuals 1 through 21.

ALBERT KAYE114A Sumner Ave.Brooklyn, N.Y. 11206

Jud Williams Model A Curve Trac-er. Will accept any reasonable offer.JOHN W. BEHRMAN212 Meffan Ave.Nampa, ID 83651

Sylvania E01 color TV chassis forsale, with pushbutton tuner, yoke,color convergence board.CHARLES TV2033 McGraw Ave.Bronx, N.Y. 10462

Riders Radio Manuals 8 through23 and Riders TV Manuals 1 through26 with index. Also, one SimpsonGenescope Model 480 with manual.LANSING RADIO & TV3414 Ridge RoadLansing, 111. 60438

Riders Perpetual TroubleshootersManuals, complete set with indexes,and Riders P.A. Manual Volume 1

with index.CHARLES HOPKINS160 Maple StreetBrooklyn, N.Y. 11225

Precision VOM Model 844, RCAVoltohmyst Model 65A, LafayetteTransistor Analyzer Model 223,R.C.P. Bench VTVOM Model 662.All complete with leads and instruc-tions.FRANCIS J. CHAFFERS7337 113 St. N.Seminole, Fla. 33542

Riders Radio & TV Manuals; alsoWallace Telaides for all makes of TV.TROCH'S TV290 Main StreetSpotswood, N.J. 08884

WantedSams Photofacts, Transistor Radio

Series.LEROY E. MARCHANDAmerican Lake, Wash. 98493

Power transformer for a Zenith TVchassis 16K302; Zenith Part No. 95-2060.SID CREACEY308 Bond St.Redlands, Ca. 92373

Muntz tape players and recorderswith the following model numbers:A-12, M-60, AR -500, and HW-512.State price and condition.S. A. ELOSH, JR.231 GladstoneCampbell, Ohio 44405

RCA KRK66AM UHF tuner inoperating condition with installationnotes.LLOYD E. ST. JEAN106 Eddy DriveHuntington Sta., N.Y. 11746

Free Technical TrainingFree courses in basic electronics, ra-

dio, black and white TV, color TV andsolid-state devices, sponsored by theNew York City Board of Education,will be offered at the William E. GradyEvening Trade School, located at 25Brighton 4th Road, Brooklyn, N.Y.11235, telephone DE 2-5000.

The courses are designed to upgradethe technical competency of adults em-ployed in the electronic field. Personsinterested may register at the schoolon Monday and Tuesday, Sept. 9 and10, 1974, from 7:00 to 9:00 p.m.

THE ONLY COLOR SET

YOU SHOULD

TINKERWITH 'ti1

It takes morethan tools to be a TV service technician. It requires

know-how.especially with a color TV set. Some "doit-yourselfers"

actually do more harm than good . .. and wind up paying more money

for repairs oradjustments than they would have if they called their

local TV technicianat that first sign of trouble. So don't play with that

color set.Tinkering can be dangerous as well as expensive.

Call your

independent TV technician for safety as well as satisfaction.

THIS MESSAGEWAS PREPARED

BY SPRAGUE PRODUCTSCOMPANY,

OVVNI.10611 filftW.Va.. Of 0.1/441.1f IllC,1110C COOPI.orf

000010 00/4011MASSACIUSITTII f OM

YOUR INDEPENDENTTV -RADIO SERVICE DEALER

PUT THISBUSINESS -BUILDINGTRAFFIC -STOPPER

ON YOUR SHOP WALLOR IN YOUR WINDOW

See your Sprague Distributor for window -size blow-upsof this message. Or, send 250 to Sprague Products Co.,65 Marshall St., North Adams, Mass. 01247 to coverhandling and ma ling costs. Just 60.411

ask for Poster RP -42.

SPRAGUETHE BROAD -LINE PRODUCER OF ELECTRONIC PARTS

THE MARK OF RELIABILITY

for more details circle 130 on Reader Se vice Card


Why pay more for the Quantum?

Because the Channel Master Quantum is the most highly engi-neered reception system available today! It uses the finest state ofthe art technology to provide superior color and black and whitereception under any conditions, in the face of any problems.

Massively engineered to stand up under hurricaneforce winds and the equivalent of 12" snow load-ing, the Channel Master Quantum costs morebecause it delivers more. It's unmatched for power,directivity and flexibility!

The bold new diamond back UHF director trainprovides significantly increased gain---along the entire band ---

than previous Quantummodels did at specificchannel settings.

UHF tabs used on VHF directors eliminates anypossibility of signal interaction between thetwo bands.

The result is a sparkling new level of crisp, sharp

color and black and white performance throughrandom channel assignments within any given area.

The new Channel Master Quantumcosts more... and it's worth it!

FROM THE WORLD'S LARGEST MANUFACTURER OF TV/FM RECEPTION EQUIPMENT


---added to the mosthighly directive and

powerful VHF section on any antenna!

With gain higher than other high powered antennas, and

extremely tight front to back ratios, the Quantum VHF

section slices througri electro-magnetic interference to pull

in desired :Flannels with even crisp clarity!

And for added flexibility... Customengineered accessories slip into the Quantum'sweather protected terminal housing to handle

any problem you're likely to face----

For melting snow .n weak signal areas, modularsolid state amplifiers provide up to 15dB gain,with switchable FM traps. (models 0093-0096)

Where FM is a problem, the Quantum's optionalsolid state FM trap attenuates interferring signalsby as much as 25(111 (model 0091)

For 15 ohm mounting, use the Quantum's option-

al balun/matching transformer. (model 0089)

. . for more details circle 105 cn Reader Service Card

SEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER 1 11

TECHNICALLITERATURE

Semiconductor ReplacementsA 20 -page supplement of its ECG

semiconductor replacement guide isnow available, adding 11,000 typenumbers to the total number of unitswhich can be replaced by the ECGline. The line covers every major seg-ment of the entertainment, commer-cial, and industrial replacement mar-kets and includes transistors, integrated

circuits, diodes and rectifiers, special-purpose devices, and transistor and ICaccessories. The supplement brings thetotal number of foreign and domesticsemiconductors cross-referenced to theECG line to nearly 90,000. The re-placement guide may be obtained fromGTE Sylvania electronic componentdistributors.

Public Address Sound SystemsAn illustrated, 6 -page catalog de-

scribes the complete line of Ampli-Voxequipment covering almost all applica-tions for portable sound systems. Spe-

A VERY SPECIAL PRICE ON THIS BRITENER SIX-PACK

AND THE COMBINATION LOCK IS FREE!

You'll like the six-pack combination: four of the Briteners you usemost, Model C-511, plus a Model C-501 and a Model C-212.You'll like the price: Only $29.95 for units that would cost $32.25purchased individually.You'll like the free gift: a sturdy combination lock, timed justright for the "back to school" season.You'll like the results; a happy customer now, when you brightenher faded picture ... and a probable color tube sale later.

See your Perma Power distributor today, while supplies last.

PErma POWERTM

Chamberlain Manufacturing CorporationParma Power Division845 Larch Avenue, Elmhurst. Illinois 60126Telephone (312) 279-3600

cializing primarily in flashlight batteryoperated complete public address sys-tems, it offers seven distinct systems.Also listed is a comprehensive rangeof accessory items. Perma Power, 845Larch Ave., Elmhurst, Ill. 60126.

Wire and CableA new, 8 -page, 3 -color catalog of

the complete Jersey line of wire andcable products is now available. In-cluded are illustrations and descrip-tions of coaxial cable, rotor wires,parallel cord and speaker wire. De-tails given on each product includeAWG, insulation and standard packag-ing. Jersey Specialty Co., Inc., Bur-gess Place, Box 248, Wayne, N.J.07470.

Electronic Servicing AidsA 16 -page catalog of electronic

technician servicing aids-featuringthe RCA Industry Compatible TestJig Program-is now available. Thiscatalog explains the RCA ICTJ pro-gram, which can accommodate themajority of TV makes and models thathave been marketed since TV becamecommercial. The manual includes sev-en pages of photos to help identify thecables and adapters utilized with thetest jig, as well as a comprehensivecross-reference chart. RCA Parts andAccessories, P.O. Box 100, Deptford,N.J. 08096.

General Line ComponentsA 52 -page general line catalog,

designated GL -4, describes broad linesof RF connectors, coaxial connectors,microphone connectors, tube/relaysockets, and plugs. It features a com-prehensive page -referencing index toall components described to help makespecification and ordering easier thanever before. It also offers detailed in-formation on all featured products, in-cluding complete mechanical charac-teristics, dimensional line drawings andmounting hole dimensions. The cata-log is available at Amphenol general linedistributors.

Tool KitsA 12 -page catalog of tool kits de-

signed for maintenance, assembly, andrepair of the electronic, electrical,vending, computer, relay, appliance,office machine and similar equipmentis now available. It describes 18 dif-ferent stock, fully equipped tool kits,and shows 13 tool cases that can beordered empty or custom filled with achoice of tools, meters, parts contain-ers, etc. The catalog provides listingsof all the tools that are most useful to

. for more details circle 141 on Reader Service Card

12 ! ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

installers, technicians, and mainten-ance personnel. Electronic Tool Co., 15Bertel Ave., Mount Vernon, N.Y.10550.

Communications LineAn 8 -page catalog, No. 2721-C,

describing an entire line of communi-cation microphones is now availableand includes several recently developedmodels. Turner Division of Conrac Corp.,909 17th St., N.E., Cedar Rapids,Iowa 52402.

Tubes, Semiconductors and IC'sA 64 -page, 1974-75 price list cover-

ing more than 25,000 types of electrontubes, semiconductors and integratedcircuits is available. More than 100brands are included. Virtually allAmerican types and the most popularproprietary European and Japanesetypes are listed. 1SH Electronics, Inc.,

8549 Higuera St., Culver City, Ca.90230.

Thyristors and RectifiersA completely revised 36 -page cata-

log that describes over 500 RCA thy-ristors and rectifiers. "Thyristors/ Rec-tifiers," THC-500D, lists RCA thyris-tors (triacs, SCR's and ITR's), diacsand rectifiers. Data is given forJEDEC (1N- and 2N -) types, otherRCA commercial types, and RCA de-velopmental types. This catalog usesthe new type -numbers that have beenadopted for all non-JEDEC RCA thy-ristors and rectifiers. For the user'sconvenience, the "old" numbers areincluded in the index and a cross-refer-ence guide that relates "old" type num-bers to the new numbers that replacethem is also provided. RCA Solid -StateDivision, Box 3200, Somerville, N.J.08876.

Electronic InstrumentsThe free, 208 -page, 1974-75 Leasa-

metric Instrument Databook givesspec -by -spec comparisons of over5,200 electronic test instruments. Over64 pages have been devoted to rentaland lease information wherein one,two and three month rental rates arepresented. Used prices are also givenand constitute the "blue book" of theused -equipment market. Leasametric,822 Airport Boulevard, Burlingame,Ca. 94010.

Security ProductsA I6 -page catalog covers security

products for the home, apartment andauto. Securitex, 831 West 39th St., Kan-sas City, Mo. 64111.

dB

DC to10 MHz,10 mV/cmsensitivity5" CRT

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120 or 240 VAC operation,50 or 60 Hz

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Size: 1038" H x 8" W x 161.2" D Low -capacitance 10:1 probe

available

SEE YOUR ELECTRONICSDISTRIBUTOR OR WRITE FORCATALOG 4300

SIMPSON ELECTRIC CO.853 Dundee Avenue, Elgin, Illincis 60120(312) 695-1121 CABLE: SIMELCO TELEX: 72-2416IN CANADA: Bach -Simpson, L:d., London, OntarioIN ENGLAND: Bach -Simpson (U.K.) Limited, Wadebridge, CornwallIN INDIA: Ruttonsha-Simpson Private, Ltd., Vikhroli, Bombay


SEPTEABER 1974, ELECTRONIC TECHNICIAN/DEALER 13

ELECTRICAL kOuiP ENTGROUP

Heath counterswill stack up

against anybody'sthe $149.95', IB-110030 MHz, 5 -digit kit -formcounter

the $250.00', SM-118A30 MHz, 6 -digitassembled autorangingcounter

the $199.95', IB-1101100 MHz, 5 -digit kit -formcounter

the $279.95', IB-1102120 MHz, 8 -digit kit -formcounter

the $340.00', SM-128A110 MHz, 7 -digitassembled autorangingcounter

the $349.95', 18-1103180 MHz, 8 -digit kit -formcounter

the $425.00', SM-128B110 MHz, 7 -digit,assembled high stability,autoranging counter

the $495.00', SM-110A180 MHz, 7 -digit,assembled counter

the $675.00', SM-110B180 MHz, 7 -digit,assembled high stability,programmable counter

the $895.00', SM-110C600 MHz, 7 -digit,assembled high stability,programmable counter

0 3 5 7 9 -

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Compare our frequency counters with the competition.Spec for spec, dollar for dollar, you won't 1 ind better buysthan counters from Heath. We have the performanceyou need at the price you want to pay. Our completeline is shown above. They feature the latest in countertechnology with the reliability and trouble -free perform-ance you've come to expect from Heath. Get completedescriptions and specifications for all Heath frequencycounters-both kit and assembled. Send for your freecatalogs now!

Send for your FREE Heath catalogsr

Heath CompanyDept. 199-9Benton Harbor, MI 49022 Please send the new 1975 Heathkit catalog. Please send latest Assembled Instruments catalog. Enclosed is plus shipping.

Please send model(s)NameAddressCity State ZipPrices 8 specifications subject to change withoJt notice.

*Mail order prices; F.O.B. factory. Al -107

Schlumberger

TECHNICAL DIGEST

The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

ADMIRALColor TV Chassis M24/M25/M30-Vertical-Output Transistors

Vertical -output transistors with two different case styleswere used interchangeably in production of the M24, M25and M30 chassis. There is no electrical difference betweenthe case styles; either may be used to replace the other.

The mica insulator packed with the replacement mustbe used when replacing one case style with the other. Besure to apply silicone grease to both sides of the new in-sulator to insure maximum heat transfer to the sink. Makesure that the insulator is undamaged and that there are no

COLL.C St

MICAINSULATOV.32A1198-5

NPN PNP57A205-14 & 57A206-14

COLL.CASt

MICAINSULATOR

3211898.3

NPN PNP57A244-14 & 57A245-14

burrs or foreign particles on any of the mating surfaces thatmight damage the insulator or prevent proper seating of thetransistor.

It is also important that the mounting screw(s) betightened sufficiently to position the transistor in firm con-tact with the insulator and, in turn, with the heat sink.

The above precautions apply to all power transistorswhich are mounted on heat sinks.

PHILCO-FORDMonochrome TV 19 -inch Models-Picture Tube Mounting Ring Removal

The front mounting ring or wire band which holds the19 -inch picture tube to the cabinet front is secured by acoil spring which maintains tension on the ring. Thisspring must be compressed to relieve the tension duringpicture tube replacement. However, standard pliers pre-sent a problem of slipping off the compressed spring.

Although "special" tools are available with which tocompress the spring, such as the type of pliers used tocompress automotive brake springs, the following methodusing readily available hardware can also be used:

Obtain a 3/ I6 -inch nut and a bolt approximately 21/2inches long (hex or slotted head). (The type of bolt usedto secure the mounting ring on small -screen sets can beused.) Insert the bolt through the spring from the bottom,mount the nut, and tighten until the spring compressesand the mounting ring is loose. This arrangement also willsafely hold the spring compressed during remounting ofthe new picture tube.

MOVING?Be sure to let us know your new address.Please enclose a complete address labelfrom one of your recent issues.



ELECTRONICASSOCIATION DIGESTInformation about the activities of national, state and local associa-tions of electronic servicers, dealers and manufacturers. Materialfor publication in this department should be addressed to: ServiceAssociation Digest, ET/D. 1 East First St., Duluth, Minn. 55802.

NESDA Terminates Contract with ElectronicService Dealer Magazine

The House of Representatives of the National ElectronicService Dealers Association (NESDA), in a special sessionin San Antonio, Texas, in April, terminated its contractwith Electronic Service Dealer Magazine (ESD), underwhich that monthly magazine had functioned as the officialpublication of NESDA since 1960.

Commenting on the termination in an editorial in ESD,Donald J. Martin, publisher and editor, said: "With thetermination of our contract we hope that something willtake its place and that there will, indeed, be an organizedservice industry. Many of the leaders have faded from thepicture with time and have been replaced to a certain de-gree. The exact extent of this replacement, it seems to me,is still suspect. . . . ESD has always been a labor of loveand a fight for what is right. It seems the industry, or atleast NESDA, doesn't need this help any longer."

NESDA has announced plans to publish a NESDA-owned magazine.

ConventionsThe Arizona State Electronics Association has an-

nounced that its second annual convention will be heldSept. 27-29 at the Francisco Grande Hotel in Casa Grande,Arizona.

The Oregon Television Service Association and theWashington State Electronics Council will hold a jointConvention Sept. 27-29 at the Lamplighter Lodge inSpokane, Washington.

NESDA Business Management Coordinator ResignsLes Nesvick, Business Management Coordinator for the

National Electronic Service Dealers Association (NESDA),has announced his resignation from that post.

The reason for his resignation reportedly is that theNESDA Business Management Program could not finan-cially support a full-time manager.

NESDA Executive Vice President Testifies BeforeFederal Commission Examining Causes ofConsumer Electronic Fires

Richard L. Glass, executive vice president of the Na-tional Electronic Service Dealers Association (NESDA),recently testified about TV fires before the ConsumerProduct Safety Commission, which is gathering informa-tion on which it will base mandatory rules for the incor-poration of safety features in TV receivers.

Glass told the Commission that consumer negligencecan sometimes contribute as much to TV fires and shockhazards as the design of the receiver.

Glass also told the Commission that a build-up of greaseand dust in older sets can cause fires. Citing other causesnot related to design, he told of one case in which a petmonkey dumped a vase of water on a set, causing a fire,which then was spread as "the monkey jumped aroundsetting the drapes on fire."

"Even mice have been known to short out TV receiv-ers," commented Glass.

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... for 'note de:ails circle 127 on Reader Service Card


New in Color TVfor 1975 -Part 1More all -electronic tuning devices

and modular solid-state chassis within -line picture tubes highlight TVlines for the coming year

Despite color TV sales being off for the first part of1974, predictions are that close to nine million unitswill be sold by year's end, slightly under the ten millionsold last year.

Reflecting the rising costs of labor and raw materials,along with stiffening competition, the retail prices ofmost color TV sets for 1975 are about 5-10 percentabove comparable models of last year.

Only moderate physical and electrical changes havebeen made in most TV set lines. These changes aremost noticeable in the small -screen portable line, whichwill account for about 40 percent of the units sold dur-ing the model year. Many of the deluxe features previ-ously found only in large -screen receivers now are alsooffered in many portable TV lines.

Fig. 1-Admiral's 1M30 modular all -solid-state color TV chassis.

Fig. 2-Admiral's 25L91 color TV receiver features Electronic DigitalTouch Tuning and Color Master Control system.

It is anticipated that the lines of almost all majormanufacturers of color TV receivers will be completelyall -solid-state by mid 1975.

In this first of a three-part series, the compositionand general features of the 1975 color TV lines arepresented. Typical features included are:

Admiral has added electronic touch -tuning, withdigital read-out channel numbers

General Electric has introduced a new "YA"modular, solid-state color TV chassis, which featurestheir third -generation in -line picture tube

An all -electronic tuning system, called STAR, hasbeen introduced by Magnavox; this new system makeslocal and remote -controlled tuning and adjustment sim-ple, quick and quiet

Panasonic's new color line includes seven porta-ble sets equipped with the new Quintrix picture tube,plus three Quatrecolor console sets

Philco-Ford has introduced 11 consoles withInvis-A-Tenna, a dual -loop antenna system built in un-der the cabinet top

Quasar Electronics Corporation (successor com-pany to Motorola) has updated the Quasar line withcolor TV's featuring fewer modules, more IC's and aroom light sensor

RCA this year has become the first domestic TVmanufacturer to offer a completely all -solid-state colortelevision line, and has reduced the number of modelsavailable

GTE Sylvania's new line includes a second gener-ation of self-adjusting color TV sets with a new systemfor automatically adjusting color, contrast and bright-ness

Zenith has increased the number of modelsequipped with varactor tuning.

ADMIRAL

There are a total of 46 color TV models in the newAdmiral line. Approximately 25 of the TV models useall -solid-state modular chassis, and the remaining 21are equipped with hybrid chassis, which use both tubesand transistors.

The Admiral 1975 color TV line consists of twenty-two 25 -inch (diagonal) consoles, twelve 19 -inch(diagonal) table models, one 18 -inch (diagonal) hy-brid table model, five 17 -inch (diagonal) portables,two hybrid 16 -inch (diagonal) portable, one hybrid13 -inch (diagonal) portable, one hybrid 13 -inch (di-agonal) table model and two hybrid 12 -inch (diagonal)portable.

Most of the 19 -inch (diagonal) models feature theSuper-Solarcolor black matrix in -line picture tube,which utilizes a negative black matrix slot mask. Theprecision in -line gun reportedly provides increased il-lumination of the phosphors through the slot mask and,consequently, produces a brighter picture.

The Modular SS 1000 series chassis, shown in Fig. 1,are all solid state. Most of the circuitry in these chassisis contained on "satellite" plug-in modules. The mainchassis slides out for easy access. Most models includethe Color Master control, which, when pressed in,switches color, tint, brightness and contrast to factorypreset levels. If the factory settings do not please the

16 ' ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

B&Kintroduces two ways to make

troubleshooting easier.Few things are handier ona troubleshooting job thana good substitution box.That's why B&K takespride in introducing ournewest and handiest sub-stitution boxes-at pricesyou wouldn't expect.

Our new Model 2901is an ultra -compact, 36 -component box with fullprotection for the circuits,.the components, and you.It features a high -capacity(1000 mfd), low -voltagecapacitor for transistorizedcircuits, and a special surgeprotection circuit that pre-vents arcing and healing ofelectrolytics. And it's allin a rugged box weighingonly 11/4 pounds.

$7700(Model 2902)

Our new Model 2902Substitution Master givesyou an array of 76 most -needed resistors and capac-itors, including 20 elec-trolytics with special capa-bility for transistorizedcircuits-- plus a dioderectifier. Its special surgeprotection circuit reducesproblems by preventingarcing and healing of elec-trolytics; low -voltageelectrolytics are protectedby a front -panel overloadindicator. The 2902 letsyou select up to 5 com-ponents for simultaneoussubstitution, includingsignal and power resistors,paper/disc and electrolyticcapacitors.

Thus you can make upa simple but complete

power supply circuit, in-cluding bleeder and powerresistors, filter capacitors,and the rectifier. Or youcan make up a voltage di-vider by selecting the 2resistors of the desiredalues. For their capabil-

ities, our Models 2901 and2902 Substitution boxesare the best values onthe market today

Whichever youchoose, we think it willprove to be one of yourmost valuable trouble-shooting tools. And that'sjust what you'd expectfrom B & K.

Contact your distribu-tor, or write DynascanCorporation.

$4100(Model 290!)

ng Very good equipment at a very good price.Product of Dvnas,-.

... for more details c rcle 101 on Reader Service CardSEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER 17

viewer, he can easily readjust the controls himself.Admiral's Digital Touch Tuning is featured in two

top -of -the -line models. This tuning system comprisesseven complete module assemblies, a Sonar remote-con-trol receiver with input transducer, and a channel se-lector panel called the Flex -Key Assembly. (Shown inFig. 2 is the Model 25L91 with Digital Touch Tuning.)Because the system has no moving parts (other than theSonar relays), mechanical friction and wear are elimi-nated. The system can be operated either locally or byremote control. Once the system is fine tuned and pro-grammed for each active channel in the user's locality,it requires no further adjustment, unless "external" con-ditions change.

The Digital Touch Tuning system allows presettingof up to 18 channels in the UHF and VHF bands. AllVHF channels and up to six UHF channels may bepreset at one time; each UHF preset control may betuned to any UHF channel in the UHF band.

The system also provides an audio mute feature,which is activated only by the remote hand unit. It pro-vides approximately 60 seconds of audio silence, start-ing from the time the MUTE button on the hand unit ispressed. If at any time during the 60 second intervalthe MUTE button is pressed again, the MUTE cycle isterminated and sound is restored to normal.

The Digital Touch Tuning system uses digital logiccircuits and electronic switches.

To change channels, the viewer simply touches thenumber of the desired VHF or UHF channel on thecontrol panel (all VHF and up to six UHF channels).After the channel change, which is noiseless and in-stantaneous, the channel number appears on a lighted,digital read-out panel next to the screen.

Sonar Remote Controls are available on both port-able and console models. This feature is available intwo different configurations: a dual -function unit, whichturns the set on and off and changes channels, and afour -function unit, which turns the set on and off, ad-justs the volume and changes pre -selected channels.

Admiral's lowest priced model is the Color Playmate(2427P), a 12 -inch (diagonal) portable in a poly-styrene cabinet with walnut -grained finish.

All hybrid color TV sets with 19 -inch (diagonal)screen sizes or less have a 90 -day, carry -in labor war-ranty.

All -solid-state color TV sets with 19 -inch (diagonal)screen or less have a one-year, carry -in labor warranty.

The all -solid-state 25 -inch (diagonal) console colorTV sets have a one-year, in -home labor warranty.

The hybrid 25 -inch (diagonal) console color TVsets have a 90 -day, in -home warranty.

All Admiral color picture tubes have a five-year "ad-justment" warranty.

GENERAL ELECTRIC

A total of 82 models are offered in General Electric's1975 line of color TV receivers. All -solid-state chassisare used in 57 of the models. The remaining 25 areequipped with hybrid chassis.

Screen sizes and types of models in the line are:forty-one 25 -inch (diagonal) solid-state consoles, nine

Fig. 3-General Electric's new "YA" modular, solid-state color TVchassis which is used with GE's third generation inline picture tube.

Fig. 4-General Electric's Model YA5508WD color television set with13 -inch (diagonal) in -line picture tube.

19 -inch (diagonal) solid-state portables and/or tablemodels, three 17 -inch (diagonal) solid-state portables,one 16 -inch (diagonal) solid-state portable, three 13-inch (diagonal) solid-state portables, nine 19 -inch(diagonal) hybrid portables and/or table models, andsixteen 10 -inch (diagonal) hybrid portables.

Six chassis are used in GE's 1975 color line. The YAand MC chassis are new, modular, all -solid-state types.The MB -75 and QB are carry-over all -solid-state chas-sis with some major changes. Chassis CD and HE arecarry-over hybrid types without any significant changes.

The new YA chassis (Fig. 3) is an all -solid-state,modular, swing -away type on which is mounted sevenmodules. The swing -away design makes all modulesand components easily accessible. The YA chassis isused in two models, a 13 -inch (Fig. 4) (diagonal) anda 17 -inch (diagonal), both of which are equipped withGE's new Porta-Color MX -2 shortneck, 90 -degree, in-line picture tube. The 17 -inch version of the MX -2 pic-ture tube requires 27.5kv of second -anode voltage.

18 ' ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

Fig. 5-Magnavox's new solid-state, modular T995 color TV chassistilts -out, to clear cabinet.

Fig. 6-Magnavox color TV sets equipped with the "STAR" remote -control system display the channel number on the screen in the formof a six -inch -high digit. Shown on right of the photo is the "STAR"remote control unit with a control panel which resembles that of anelectronic calculator.

The new MC chassis is an all -solid-state, modulartype which is used in a number of 25 -inch (diagonal)consoles. The 25VDCP22 picture tube used with theMC chassis requires 30kv of second -anode voltage.

A new Custom Picture Control lets the viewer ad-just the contrast, brightness, and color simultaneouslywith a single knob. The pre-set balance remains con-stant as the viewer adjusts the Custom Picture Controlto compensate for room light conditions or station sig-nal changes. In addition, an automatic One Touch Col-or System, with pre-set controls, provides a sharp colorpicture with a touch of the AUTO button. The systemincorporates Tint Lock, AFC, and pre-set color, tintand brightness controls. The tint lock has the effect ofwidening the color demodulation angle by cross -cou-pling the B -Y and G -Y signals at the output of thechroma demodulator IC. The pre-set controls asso-ciated with the One Touch Color System are a set ofcolor, brightness, and tint controls pre-set at the factory.

General Electric's color portable television line offers

a variety of features in 10-, 13-, 17-, and 19 -inch(diagonal) models.

Various models employing this chassis feature a widecontrol panel with side -by -side controls for VHF andUHF channel selection and fine tuning. The AUTObutton, new Custom Picture Control and Push -On -Set -

and -Forget Volume control are side by side under thechannel -selector knobs. All of the other secondary con-trols are contained in a drawer. The drawer operateswith an action like the "AUTO" button-push in toclose the drawer, and push in again to open the drawer.The "Manual" COLOR, TINT, and BRIGHTNESS controlsplus the VERTICAL HOLD and AFC switch are at the frontof the drawer. To operate, grasp and turn each knobwith the thumb on top and the fingers underneath thedrawer. The AUTO pre-set COLOR, TINT, and BRIGHT-NESS controls are located underneath the drawer.

The MB -'75 chassis is basically an MB chassis withAUTO controls, accessible to the customer in the sec-ondary control bin, and the new Custom Picture Con-trol. These features allow viewers to set color, tint andbrightness to their own taste for the Auto operationalmode. The PICTURE control adjusts the contrast andcolor levels simultaneously with one control.

The Model MB9200WH is a basic MB chassis witha sophisticated electronic tuning control package, re-mote control feature and digital channel readout.

The QB color television chassis are the next genera-tion of the QA chassis. New features include increasedhigh voltage (to 29.5kv), an improved One TouchColor circuit, defeatable Insta-Color circuit, a CustomPicture Control and pre-set color, tint, and brightnesscontrols.

All -solid-state GE chassis have a one-year warrantyon parts and service.

The hybrid GE chassis have a 90 -day labor warrantyand one-year parts warranty.

All of the GE color picture tubes carry a two-yearwarranty.

MAGNAVOX

Magnavox's 1975 all -solid-state color TV line con-sists of 43 models featuring modular chassis and offersscreen sizes ranging from 13- to 25 -inch (diagonal).

Models are: two 13 -inch (diagonal) portables withthe new T985 chassis, one 15 -inch (diagonal) portablewith the new T986 chassis, four 17 -inch (diagonal)portables with the carry-over T981 chassis, three 19 -inch (diagonal) portables with the carry-over T982chassis, six 19 -inch (diagonal) table models with thenew T987 chassis, twenty-two 25 -inch (diagonal) withthe new T995 chassis, and five 25 -inch (diagonal)stereo theaters, which are equipped with the new T989color TV chassis.

All of the 13-, 15-, 17-, and 19 -inch models employnegative -matrix, precision in -line picture tubes.

The new vertical, solid-state T-955 chassis, shown inFig. 5, includes: a MOSFET (field-effect transistor),Video IF circuit, which reportedly provides increasedsensitivity for improved reception in fringe areas and aChroma Leveling Circuit, which is used to reduce oreliminate surges of color that sometimes occur when


scenes change. A new video circuit maintains the dark-er portion of the picture at a constant level, and pre-vents a "gray shift" during certain scenes. To protectthe TV set from power -line surges, a new voltage -regu-lating transformer is used in the power supply.

There are 14 solid-state modules used in the T-955chassis. The vertical -framed chassis, into which themodules are plugged, tilts out completely clear of thecabinet. Two tilt -out positions are possible: one at 45degrees and a second at 20 degrees from the horizontalposition.

Almost all Magnavox color TV sets, including thenew 13- and 15 -inch (diagonal) color TV portables,are equipped with the Videomatic one -button color TVtuning system. The Videomatic system provides auto-matic fine tuning and automatic adjustment of color,tint, contrast and brightness. The system also includesan LDR (light dependent resistor), which automaticallyvaries the brightness to compensate for changing roomlight.

Magnavox's new all -electronic tuning system, calledSTAR, can be activated either locally or remotely. Thepush-button, remote -control unit used with the system(Fig. 6), resembles an electronic calculator. It providesdirect access to all 82 VHF and UHF television chan-nels, which are factory pre-programmed. After eachpush-button selection, the channel number is displayedin large, easy -to -read, six-inch digits on the picturetube screen. After about three seconds, the channelnumber fades out, but it can be instantly recalled andredisplayed by touching the recall pushbutton on theremote -control unit. In addition to the two -digit, ran-dom-access, channel -selector and channel -recall push-buttons, the remote -control unit also includes on/offpush buttons for "infinite" volume up or down and mutefunctions.

All Magnavox color console, table and portablemodel TV sets carry a two-year warranty on the colorpicture tube and one-year warranty on labor and parts.

PANASONIC

Panasonic has introduced a new line of seven all -solid-state portable models and three 25 -inch (diagonal)console models featuring the new Quintrix picture tube.

Two of the units, the Model CT -924 (Fig. 7) andCT -934, are Quatrecolor sets with 100 -percent solid-state, modular chassis which produce a picture tubesecond anode voltage of 28.5kv. Both of the modelsare equipped with 19 -inch (diagonal) picture tubes.

The remaining portables include two 19 -inch (diag-onal) units, Models CT -914 and CT -974; one 17 -inchset, Model CT -714, and two 13 -inch receivers, ModelsCT -324 and CT -314.

Panasonic's three 25 -inch Quatrecolor consoles --theCT -2514, the CT -2524 and the CT-2534-feature anegative guard -band black matrix picture tube (30kv)and 100 -percent solid-state, modular chassis.

The advanced Quintrix tube (Fig. 8) is designedwith a negative guard -band black matrix and an addi-tional pre -focus lens for sharper picture detail underhigher brightness conditions. Conventional color pic-ture tubes have four electrodes and two electron lenses.

Fig. 7-Panasonic's Quatrecolor TV receiver Model CT -924 is equippedwith a solid-state, mcdular chassis which produces a second anodevoltage of 28.5kv.

*.;ross Section of Picture TubePanasonic Quintrix lisbirs Tube

&Wiry lens

Seal; hbleMedial Boa

1G, Gs C.,

MainLenStade. Mielk Screen

Sew lk,r

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Fig. 8-Cross section of Panasonic's Quintrix color picture tube, whichhas an additional pre -focus lens, five electrodes and three electronlenses.

Fig. 9-The Philco-Ford BOSS 300 color TV chassis is equipped with 13plug-in modules and up to eight IC's, depending on the version.

The Quintrix picture tube has five electrodes and threeelectron lenses. An additional prefocus lens in theQuintrix tube reportedly produces a finer, sharper elec-tron beam. And because the condensed electron beamhits each phosphor dot more accurately, picturefocus and resolution reportedly are improved.


Fig. 10-Philco-Ford Model C2507FPC color TV set is equipped withthe BOSS 300 TV chassis.

Fig. 11-Super Imta Matic tuning is employed in Quasar ElectronicCorporation's Model WL9210LW color TV. An electronic system keepsbrightness, contrast and color intensity in balance and compensatesfor changes in rum brightness.

PHILCO-FORD

Twenty-four of the 26 new models in Philco's 1975color TV line are 100 -percent solid-state (seven morethan last year). Of these, 21 feature an updated ver-sion of the BOSS chassis, which was introduced twoyears ago.

Two models of the redesigned chassis are offered:BOSS and a BOSS 300 (shown in Fig. 9). Both chassisare equipped with 13 plug-in modules and up to eightIC's, and also are equipped with additional voltage -protection and voltage -regulating devices.

Models in the new Philco-Ford color TV line are:a new 13 -inch (diagonal), all -solid-state portable fea-turing an in -line, slot -mask picture tube; two carry-over, 18 -inch hybrids; two new 19 -inch hybrids; and

five 19 -inch and eighteen 25 -inch (diagonal) sets, allwith 100 -percent solid-state chassis.

Three of the 19 -inch portables and four 25 -inchmodels have the improved BOSS chassis. (The ModelC2507FPC is shown i a Fig. 10). The high-perform-ance BOSS 300 is offered in the other fourteen 25 -inchsets, including a table model with optional legs or roll -about base, 11 consoles and two home theater com-binations.

All 25 -inch sets have tilt -front controls, while twoof the 19's and 11 of the 25's have hideaway controlpanel doors.

The 11 consoles with the BOSS 300 chassis featurePhilco's exclusive Invis-A-Tenna, a dual -loop antennasystem built in under the cabinet top. A four -positionselector permits adjustment of the antenna for best re-ception on any channel.

Another feature offered in two 19 -inch portablesand fourteen 25 -inch sets is Hands Off tuning, whichemploys a network of automatic circuits to simplifytuning.

The TV chassis used in most of the 1975 F Line19- and 25 -inch models is known as the vertical BOSS.The various versions of the chassis are quite similar.Differences primarily involve picture tube sizes, high -voltage values and special features such as Philcomatic,ACT, remote control, etc. The following BOSS chassismake up the F -Line: 5CS51, 5CS52, 5CS61, 5CS62,5CS63, 5CY82, and 5CY93.

The signal system of the vertical BOSS chassis iselectrically almost identical to the horizontal BOSSchassis used in the "E" line. However, the mechanicallayout of the modules on the small -signal "mother"board is entirely different. The power supply, vertical -sweep and horizontal -sweep circuits also are differentthan those used on the horizontal BOSS chassis.

Color TV consoles with 25 -inch (diagonal) screensizes employing the new BOSS 300 chassis have a two -years' parts and labor fin -home) guarantee.

Other color TV's employing the BOSS chassis carrya one-year (in -home) guarantee on parts and labor.

All color picture tubes in the Philco-Ford 1975 linecarry a two-year exchange guarantee.

QUASAR ELECTRONICS CORPORATION

There are 34 models in the 1975 Quasar color TVline, 21 of which are consoles and 13 of which areportables. Twenty-seven of the 34 models are all -solid-state, the remaining seven are hybrid models.

The line consists of twenty 25 -inch (diagonal) con-soles, one 23 -inch (diagonal) console, eight 19 -inch(diagonal) portables, two 18 -inch (diagonal) portables,one 17 -inch (diagonal) portable, one 14 -inch (diag-onal) portable and one 12 -inch (diagonal) portable.

Two new all -solid-state chassis have been introducedin the Quasar 1975 color TV line. They are the TS -942, which is used in 25 -inch (diagonal) console (Fig.11) and table models, and the TS -941, which is usedin portable models. Both chassis, which are similar ex-cept for the physical layout and power supplies, areequipped with fewer modules than previous Quasarchassis. Non -remote versions of the new chassis (Fig.


Fig. 12-Me number of modu es in Quasar Electror ics Corporation'snew sclid-state, modular QS3011 color TV chassis has been reducedfrom eight to five.

Fig. 13-RCA's Model GT803 color TV receiver employs the CTC68chassis and an electronic digital channel indicator.

12) have only five modules; comparable previous chas-sis have eight. Remote -controlled versions of the newchassis are equipped with only six modules.

Console versions of the new TS -942 chassis areequipped with a regulated power supply which uses aFerro Resonant power transformer and a full -waverectifier configuration.

Portable versions of the TS -941 chassis are equipped

with a compact, transformerless, plug-in, regulated,power -supply panel.

Other significant features of the TS -941 and TS -942chassis are a new twist -lock power supply connector,which eliminates the multiple wire connectors used inprevious chassis, and an additional integrated circuit(a total of four, compared to three in previous com-parable chassis).

The Insta-Matic color tuning system has been up-dated to a more "total" system called Super Insta-Matic, in which the picture is electronically controlled,keeping brightness, contrast and color intensity in bal-ance with changes in room brightness. A honeycomblens, similar to that used in a light meter, is placed ad-jacent to the Insta-Matic button. Behind the lens is alight dependent resistor (LDR).

All Quasar solid-state color TV units employ aVIDEO PEAKING control, which permits the viewer toselect the preferred degree of picture sharpness.

Five of the color TV consoles are equipped withSatellite remote -control tuning and Slumber Sentry,an added electronic feature that turns -off the receivershortly after broadcast transmission ends. The all -solid-state QS3000 chassis is used in consoles, table andportable TV sets.

All Quasar table and console model color TV setsin the 1975 line have a one-year (in -home) servicelabor warranty. All Super Insta-Matic-equipped Quasarportable color TV models also have a one-year (in-home) service labor warranty.

In -home service labor for 90 days is provided for19 -inch (diagonal) receivers without Super Insta-Maticcolor tuning. The Quasar portable color TV modelswith 12 -inch (diagonal) through 18 -inch (diagonal)screen sizes have a 90 -day (carry -in) service laborwarranty. The two-year guarantee on color picturetubes and one-year guarantee on other parts continueson all Quasar color TV receivers.

RCA

RCA's entire 1975 color TV line is equipped withall -solid-state, modular XL100 series chassis.

(Two "special" series of 14 -inch and 18 -inch (di-agonal) models equipped with carry-over CTC51 andCTC53 hybrid chassis were introduced by RCAearlier this year, but production of these models wasterminated shortly after RCA announced that theirentire 1975 color TV line would be equipped with all -solid -state chassis.)

Only four chassis are used in RCA's new line, andonly one of these, the CTC72, is new. This chassis isan update of the CTC62. The CTC72 is used in modelsequipped with RCA's precision in -line picture tube.The remaining three chassis-CTC58, CTC68 andCTC71-are carry-over XL100 chassis.

A total of 33 models are offered by RCA for 1975:twenty-six are 25 -inch (diagonal) consoles, one is a25 -inch (diagonal) table model, one is a 19 -inch (di-agonal) table model and the remaining five are 15- and17 -inch (diagonal) portables equipped with the newCTC72 chassis and precision in -line picture tube,which requires 30kv of second anode voltage.

22 1 ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

The sispropackage thatsolves the toughest ones!Our most expensive antenna package is one ofour best sellers. And that's not too surpr sing.There are lots of people who live in difficult re-ception areas who demand the best possiblepicture quality. And they are willing to pay for it.To satisfy that demand for excellence in TV re-ception, antenna dealers who have "tried themall" frequently end up recommending the CW-1001 with Winegard's special high gain, low noisepreamp. A great combination that makes the pic-ture look good and makes you look good.

What Makes The CW-1001 Different?Check These Winegord Features: Unique wedge design offers increased signal

capture area in a much shorter and more com-pact antenna.

VHF vertical beam phasing rejects interferen-ces such as airplane and auto ignition roise.

Patented UHF driven element assembly andpatented parabolic reflector screen provideunprecedented gain in an all band antenna.

Special lightning protection circuit preventsstatic electricity build-up and arcing.

FM control elements allow attenuation of strongFM signals where they interfere with TVreception.

Winegard 82-ch. CW-1001with AC -982 preampl fier*

Choice of 300 or 75 ohm downlead. New truss construction with three mast clamps

and super strong ellipsoidal booms of specialaluminum alloy team up to provide rugged re-sistance to wind and weather.

Special High Goin, Low NoisePreamps

Winegard's finest. Designed for the ultimate indeep fringe reception.

High gain and low noise insures near perfect,snow -free color.

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Unique For 75 ohm downlead only.This great combination of antenna and preampli-fier represents the finest effort of twenty years ofWinegard television reception research. See yourdistributor or write Winegard Company.For VHF only, use CW-2002 with AC -913 preamplifier.

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The most significant chassis design changes involvethe elimination of the instant -on feature from all chas-sis and the introduction of an updated version of theMAC002 chroma 1 module. The new module, desig-nated MAC002B, replaces the MAC002A moduleused previously in most XL100 chassis. The "B" ver-sion of the module uses an IC, closed -loop, voltage -controlled oscillator in place of the IC, injection -lockedreference oscillator used in the "A" version. A new ICin the "B" version also has eliminated the color -killerand ACC adjustments.

The most significant new features introduced in the1975 line are a Digital Channel Indicator (Fig. 13),which is used in select 25 -inch (diagonal) consolesequipped with the CTC68 chassis, (Fig. 14) and anew tuner design which employs a MOSFET transistorin the mixer stage.

The Digital Channel Indicator consists of two, seven -segment, gas -filled, indicator lamps, the segments ofwhich are activated by concentric, segmented switchesdriven by the VHF and UHF tuner shafts. A pair ofneon lamps are used to indicate whether the digital in-dication is a VHF channel or a UHF channel.

All models in RCA's 1975 line are equipped withtuners which use dual -gate MOSFET mixers. The low-er inherent noise of the MOSFET, combined with theability of the MOSFET to accept stronger signals with-out overload and resultant cross modulation, reportedlyprovide improved receiver signal-to-noise ratio. Theability of the MOSFET to handle higher input signallevels without overload permits the application of RFAGC to be delayed, thereby improving the tuner signal-to-noise ratio during reception of moderately weaksignals.

The full XL100 line of color portable, table and con-sole models represents a departure from past RCAproduct lines in that a number of previous deluxe fea-tures are now common to all models, including 100 -percent solid-state chassis, automatic fine tuning andnegative matrix picture tube.

All models using the CTC68 chassis have AutomaticFine Tuning (AFT), a 25 -inch (diagonal) picturetube, and develop a high voltage of 31kv.

Complementing the CTC68 chassis and sharing mostof its all -solid-state circuits is the CTC58 chassis. Twoversions of this carry-over chassis are continued in theT -Line. Both of the chassis versions are electricallyidentical except for changes in the section of the powertransformer circuit that supplies the picture tube fila-ment. Television receivers using the CTC58 chassisfeature AFT, a 70 -position, detent UHF tuner, and a25 -inch (diagonal) picture tube.

The remote -control system in this year's RCA colorTV sets is similar to that used in R -Line products. Anew mechanical hand unit, the KRT6B, operates inconjunction with the carry-over CTP22 remote receiv-er circuitry.

All RCA color TV sets carry a one-year parts andlabor warranty and a two-year warranty on the colorpicture tube.

SONY

Sony's color TV line for 1975 consists of 12 models,available in 5-, 9-, 12-, 15-, 17-, and 19 -inch (diag-


.ww-

Fig. 14-The RCA tor -of -the -line CTC68 color TV chassis is used ina variety of 25 -inch (ciagonal) console TV receivers.

41.111.1111.11111110m11

Fig. 15-Sony's Model KV-9200 9 -inch (diagonal) Trinitron Color TVweighs only 20 lbs.

onal) screen sizes. Each unit is equipped with theTrinitron picture tube. The Sony Model KV-9200 isshown in Fig. 15.

Model types and screen sizes in the new line are:one 5 -inch (diagonal) portable, one 9 -inch (diagonal)portable, two 12 -inch (diagonal) portables, three 15 -inch (diagonal) portables, three 17 -inch (diagonal)portables, and two 19 -inch (diagonal) portables.

New models are the KV-9200, KV-1203, KV-1214,KV-1711 and KV-1910.

Models carried over from last year are the KV-5000,KV-1500, KV-1510, KV-1520R, KV-1722, KV-1730R and the KV-1920.

All Trinitron models have one -button control forautomatic fine tuning, solid-state circuitry and ear-phones. Four of the models-the KV-1711, KV-1722,KV-1910 and KV-1920-have Sony's new 114 -degreeTrinitron picture tube. This wider -angle, smaller -neck

Fig. 16-GTE Sylvania's ST Matic II [10 chassis is equipped with a new IC color system and a new IC ado contrast and brightness system.

Fig. 17-Sylvania's Model 4433K color TV receiver features a 20 -channel, electronic, pushbutton UHF/VHF Touch -Tune system and em-ploys the E11-3,4 color TV chassis.

picture tube eliminates about five -inches from the depthof the cabinet.

SYLVANIA

Fifty-three of the sixty-three new GTE Sylvania col-or TV sets have chassis that are 100 percent solid-state.

There are 44 GT-Matic // color TV sets in the newline; these are available in 25-, 21- and 19 -inch (diag-onal) screen sizes.

Five models-a 19 -inch, a 17 -inch, a 15 -inch andtwo 13 -inch (diagonal) sets-have GT Matic Tuningfeatures but do not include the GT-Matic II circuits.

Also included in the Sylvania 1975 color line areseven 25 -inch (diagonal) units with 90 -percent solid-state chassis, and three TV receivers, a 17 -inch andtwo 19 -inch (diagonal) models, with 95 -percent solid-state chassis. These chassis are designated the Gibral-tar 90 and the Gibraltar 95. The chassis feature plug-

in transistors, a high -voltage multiplier, three -stage IFand integrated -circuit audio system.

A 19 -inch, a 17 -inch and two 13 -inch (diagonal)sets with solid-state chassis but without the GT MaticTuning features were also introduced.

The GT-Matic // chassis provides features not in-cluded in the simplified tuning system pioneered in origi-nal GT-Matic sets introduced last year. The GT-MaticTV sets have the customer pre-set controls, which includethe INTENSITY, TINT, CONTRAST and BRIGHTNESS,locked in a hidden tuning panel on the top rear of thecabinet. The viewer is required only to turn on the setand select a channel. The GT-Matic // receivers con-tain new IC's to make possible the addition of a newautomatic color system and a new automatic contrastand brightness system.

In most of the GT-Matic 11 chassis (shown in Fig.16) updating takes place on the chroma module, whichis equipped with three additional IC's. The GT-Matic IIseries include the E09, El0 and Ell chassis. Addition-al circuit changes appear in the E 11 chassis. This top -of -the -line chassis has a new voltage regulating trans-former power supply (C.T.V.) and 30kv of secondanode voltage.

Sylvania also has introduced a new color picturetube, Dark-Lite 50, which has a negative guard -bandblack matrix mask and a dark faceplate, which ab-sorbs room light.

Also included in the new line is a 15 -inch (diagonal)portable, the first 15 -inch set manufactured by thecompany. It features a Chroma-Line (in -line) picturetube without the dark faceplate.

The portable color TV sets employing all solid-statechassis are designated the GT-110 or GT-101 and arespecifically designed for use with Sylvania Chroma-Line (in -line) picture tube. The special "swing down"chassis construction makes all components easy toreach.

The 100 -percent solid-state GT 300 chassis is usedwith the deluxe 25 -inch (diagonal) console line of TVsets. This chassis features 30kv of regulated high -volt -


age, four stages of Video IF, and modules designed foreasier servicing.

Eighteen of the 25 -inch (diagonal) GT-Matic IImodels feature a 20 -channel, electronic UHF/VHFpushbutton Touch -Tune system. A typical model isshown in Fig. 17. Ten of these models have electronicremote controls and Dark-Lite 50 picture tube.

Fifteen other GT-Matic II (diagonal) models areequipped with a 12 -channel VHF and 70 -channel UHFdetent tuning system.

Sylvania color TV sets carry a one-year full partsand labor warranty and two-year warranty on the pic-ture tube.

ZENITH

Zenith's 1975 line of color television sets features 52basic models, with five different screen sizes.

Every set in the new line except one is equippedwith a 100 -percent solid-state chassis and featuresZenith's Power Sentry system of magnetic voltage regu-lation for the power supply.

The color TV line consist of one 16 -inch (diagonal)portable, four 17 -inch (diagonal) portables, six 19 -inch

Fig. 18-Zenith's Model F4084P is a new 19 -inch (diagonal) "decoratorcompact" console equipped with the Titan 31:10V chassis.

Fig. 19-Zenith's solid-state electronic tuning system and associatedVHF/UHF slide -type channel selector.

(diagonal) table models, six 19 -inch (diagonal) con-soles, one 23 -inch (diagonal) table model, six 23 -inch(diagonal) consoles, two 25 -inch (diagonal) tablemodels, twenty-three 25 -inch (diagonal) consoles, andthree 25 -inch (diagonal) console combinations.

The Chromacolor 11 Models include the Chromacol-or picture tube, a solid-state Titan vertical chassis, thedesign of which is now the same for 17-, 19-, 23-, and25 -inch diagonal sets, including the protective PowerSentry system of voltage regulation. Chromatic one-button tuning is also featured throughout the line.

Electronic tuning is used in 23 sets, one of which isshown in Fig. 18 Six non -remote sets now are equip-ped with this tuning system. The remaining seventeenare equipped with Zenith's Space Command remoteTV tuning system. This tuning system employs varactordiodes and can be programmed to receive up to 14VHF and UHF television channels, in any sequence ormix of VHF and UHF.

Although the same basic tuning system is used in allelectronically tuned Zenith television receivers, thereare some variations between electronic tuning systemsof those which are remotely operated with the SpaceCommand hand control and those which are non -remote.

In both versions of the electronic tuning system, lo-cated behind a panel on the front of the receiver, are 14different positions, or slots, positioned vertically. To theright and directly on line with each of these positionsis a slide -rule dial scale with coarse channel numberidentification. In the Space Command versions, furtherright and also on the same level is a thumb -wheel forprogramming and fine tuning each of the 14 positions.In non -remote models, there is a slider switch on avertical track between the channel positions and theslide -rule dial scale. (Fig. 19) Channel selection is ac-complished by moving the slide switch to the positionof the desired preprogrammed channel. The program-ming and fine-tuning control is located behind theselector knob.

The VHF and UHF tuners of the electronic tuningsystem are controlled by two solid-state "nerve centers"mounted on separate panels located behind the frontof the tuner panel.

The new non -remote electronic tuning system isstandard equipment in four of Zenith's 25 -inch (diag-onal) table model sets, and one 17 -inch (diagonal)portable set. The Space Command remote -controlledversion of the electronic tuning system is standardequipment in twelve Zenith 25 -inch (diagonal) models,four 19 -inch (diagonal) models and one 17 -inch (di-agonal) model.

A 75 -ohm antenna connector is offered in 26 dif-ferent sets, permitting convenient connection of thesereceivers to a master antenna television (MATV) sys-tem or a community antenna television (CATV) sys-tem.

All 51 all -solid-state receivers in the line are cov-ered by Zenith's Consumer Protection Plan, which pro-vides a one-year warranty on parts and labor and atwo-year warranty on the picture tube. Warranties onthe 19-, 23- and 25 -inch (diagonal) solid-state setsare covered on an in -home basis. The 16 -inch (diag-onal) hybrid portable and 17 -inch (diagonal) all -solid-state models must be taken to a Zenith servicing dealeror a Zenith distributor -approved service center.


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MODERN SERVICINGTECHNIQUES

TroubleshootingSolid -State TVPower Supplies

by B. B. Dee

Procedures for isolating defects

and tips about selecting replacementcomponents

LOW -VOLTAGE POWER SUPPLIES

Fuses Before the use of semiconductors in TV power sup-plies, fuses were relatively simple devices. In most cases,selection of a replacement fuse was easy because theonly factors you had to consider were voltage and cur-rent ratings. Today, however, selection of the properfuse replacement involves another factor: time.

Because semiconductors are damaged by currentoverloads quicker than tubes, both the amount of exces-sive current and its duration must be taken into con-sideration when a protective device, such as a fuse, isbeing selected. For these reasons, many manufacturershave begun stating the ratings of fuses for protection

Fig. 1-Simplified circuit diagram of a color TV low -voltage powersupply and degaussing circuit showing applications of varistor (VR1)and thermistor (VR2).

of semiconductor -equipped circuitry in 12T (currentsquared multiplied by time). Modern semiconductorratings stipulate the levels of repetitive and nonrepeti-tive current pulses the device can withstand withoutdamage. These ratings usually specify how many am-peres of current can be safely handled by the device,and for how many microseconds. (Shorts and overloadsare considered nonrepetitive current pulses.)

When selecting replacement fuses for protection ofsemiconductor circuits, be sure you select one whichhas the correct PT rating, or one which satisfies the re-quirements for both current rating and overload reac-tion time.

Circuit BreakersThe relatively inexpensive thermal -type circuit break-

er used in TV receivers has a limited number of "trips"before the end of its useful life is reached. If a customertells you he has been resetting the circuit breaker tokeep the set operating, replace the circuit breaker. It isadvisable to tap the reset button lightly to see if the cir-cuit breaker is intermittent-many are after hours ofuse and repeated trips, and those that have open -con-struction design can develop dirty contacts.

Varistors and ThermistorsVaristors and thermistors are nonlinear resistors; that

is, the valueamount of voltage across it, as is the case of varistors,or by the amount of current through it, as is the caseof thermistors.

The degaussing circuits of most older designs of colorTV receivers use both of these devices, as shown inFigure 1. Today's color TV receivers use only one,usually in series with the degaussing coil, which itself isconnected across the AC source.

Operation of the circuit in Figure 1 is as follows:When the set is switched on, the resistance of VR1, thevaristor, drops quickly. The resistance of VR2, the ther-mistor, increases in a few cycles. With VR2 in serieswith the coil, and VR1 in shunt, the combined effectallows a large current to flow through the coil for a briefinterval, and then the current drops to a negligiblevalue. Because the entire circuit is ahead of the recti-fiers, the current flowing through the coil is AC, whichdemagnetizes the picture tube and its surrounding area.

Because the degaussing coil is mounted between thepicture tube and its metal shield, the insulation is oftendamaged, causing a short to the grounded metal mag-netic shield. This, in turn, shorts the power transformerthrough one or more of the rectifiers and nonlinear re-sistors. The remedy consists of removing the metalshield, locating the hole in the coil insulation, taping it,then replacing the shield and any rectifiers and/or non-linear resistors which might have been damaged by theoverload. Overloaded resistors will have a burned,cracked and/or crumbling appearance. An ohmmetercheck will be required to determine if any of the recti-fiers have been damaged.

After making these repairs and before applying AC


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to the receiver, use an ohmmeter to test for any shortsin the power supply-an electrolytic might have beendamaged by the AC current.

(Caution: Operating some receivers with the degauss-ing coil disconnected can damage the varistor and/orthermistor.)

RectifiersReplace defective silicon rectifiers with the new 3 -

amp, I000PIV types. These types are relatively inex-pensive, and the "excessive" rating will provide longerlife and less callbacks.

Electrolytic CapacitorsThese capacitors can build up a high internal im-

pedance. Although a particular capacitor might pass"quickie" ohmmeter tests for reverse leakage and abilityto charge, it no longer is an effective filter if it has highinternal impedance. Usually, however, a capacitor withthis defect will cause the visual symptoms of hum barsand/or marginal sync, although it might cause a syncproblem without causing any other visual symptoms.

The best method of checking electrolytic capacitors inTV power supplies is to measure the supply voltage(s)and/or test for ripple with a scope. If the voltages arewrong, all branch circuits will have varying degrees ofincorrect voltages. The first capacitor in a power supplywill usually show five or less volts on the RMS scale ofyour meter when set on "OUTPUT," or on "AC" witha blocking capacitor in the input. Each following filtersection should show less ripple. Even vertical output de -coupling capacitors should show only a volt or lessripple; higher readings indicate a defective bypass ca-pacitor. Before assuming a capacitor is defective, alwayscheck the ground connection-a large number have badsolder connections.

FL Vent,PULSF

GROUND WON VOLTAMUD 4. OUT

Fig. 2-Typicalle-voltage rectifier tripler

HIGH -VOLTAGE REGULATORS

Shunt TypeThe principal function of the high -voltage regulator

circuit in a color TV receiver is to keep the picture tube2nd anode voltage at a constant level.

Until recently, most color TV receivers have beenequipped with vacuum tube shunt -type regulator cir-cuits. This type of circuit provides regulation by main-taining a relatively constant load, or current drain, onthe high -voltage rectifier circuit. If picture tube beamcurrent increases, the regulator tube, which effectivelyis in shunt, or in parallel, with the beam current of thepicture tube, draws less current. If the picture tubebeam current decreases, the regulator tube draws morecurrent.

Because these shunt -type regulator circuits are rela-tively simple, the usual defects consist of regulator tubefailure, changes in the high -value resistors in the regu-lator tube grid circuit or capacitor failures. If the HIGHVOLTAGE adjustment produces no change, one or moreof the above defects are likely. If the voltage remainshigh, the regulator tube is probably defective. if thevoltage is low, and removal of the anode connector onthe picture tube produces no change, the problem is in-sufficient high voltage, not a defective regulator. If thevoltage increases, the problem is in the high -voltageregulator circuit or tube. If the high voltage can beadjusted but not brought into range when the BRIGHT-NESS control is turned down, the regulator is probablyat fault-but first make sure the picture tube is not de-fective. This can be determined by removing the picturetube anode connector (put it into a hole cut in a thickrubber ball, to prevent arcing). If the problem stillexists, the picture tube can be ruled out as the source.A gassy picture tube can cause weird problems. Usuallya gassy picture tube can be spotted by removing thesocket from the picture tube while the TV set is inoperation. If a high voltage is obtained as the picturetube socket is being removed, the picture tube is a can-didate for a gas check.

Solid -State Types

No where is the proliferation of circuit design moreobvious than in the high -voltage regulation systems ofall -solid-state color television receivers. A descriptionof all of the various systems in use probably would filla small book. For the sake of brevity, we shall concen-trate on the two general types of regulation systemswhich are used most often.

One of these systems "senses" the high voltagethrough a tap in the high -voltage circuitry, and thenchanges the control grid operating point of the horizon-tal -output amplifier, which drives the high -voltage trans-former. This high -voltage regulator can be checked byrotating the BRIGHTNESS control while monitoring thepoint where the output of the sensing/regulating circuitsection is connected to the horizontal amplifier.

Sets which are equipped with the other general typeof regulating system seemingly have no apparent regu-lation for load changes at all, with only a low -voltageregulator to guard against AC power -line changes. Inthese designs, the high -voltage transformer is of thesaturating type, clipping on the voltage peaks, thusmaintaining constant output so long as the frequencyremains constant. Fortunately, in normal use, the hori-zontal frequency is closely maintained, but if the fre-quency departs from normal, changes in high voltagemight be encountered. Adjustment is made by settingthe low -voltage regulator which feeds the horizontal -output stage.

Such low -voltage regulators were formerly made ofdiscrete devices such as zeners, transistors, etc., but nowthey are integrated circuits with built-in overload pro-tection. They require a good bypass capacitor acrossboth input and output, to prevent oscillation. A varietyof trouble symptoms can be caused by oscillation, in-cluding inadequate regulation, incorrect DC output


voltage, excessive ripple, or appearance of the oscilla-tion frequency in the output voltage. Any or all of thesemight occur. If oscillation is encountered with an ICregulator, check the bypass capacitors; they have to beplaced close to the IC and securely grounded.

IC voltage regulators are usually of the series typebecause this type seemingly is more efficient, but dis-crete regulators may be either the series or shunt type.In either case, although it may be possible to vary theoutput voltage of a defective regulator with the VOLTAGEADJUSTMENT control, the output voltage still might notbe well regulated against changes in line voltages orload. A shorted series regulator permits the output volt-age to increase towards the input voltage level, while ashorted shunt regulator causes a marked reduction inoutput voltage. An open series regulator causes a largedrop in output, while an open shunt regulator causes thevoltage to increase beyond acceptable limits.

Although voltage regulators are not familiar to someTV technicians, they are quite common in industrialequipment, and can be serviced in the same manner asany feedback -type circuit. The only additional com-ponent used is a zener diode, or other source of con-stant reference voltage, which can be readily checkedwith a meter, except in the case of ICs. All ICs are con-sidered throw -away devices.

The biggest problem associated with the testing ofregulators is the possibility of damaging the variousloads if the output voltage increases. The best approachis to disconnect these loads and substitute resistors as adummy load which can be varied to produce the currentnormally drawn by the loads. Then, if the regulator cir-cuit itself is operating normally, the output will remainconstant. For series regulators, this test is contingentupon the input voltage being several volts higher thanthe desired output. If the input approaches the outputrequired, the device will not regulate.

A point often overlooked is the fact that high ripplefed into the input of the regulator can cause problemsbecause the lowest instantaneous "valley" of the. ripplemight be too low for the regulator to function properly.Therefore, it is necessary to check both input voltageand ripple.

HIGH -VOLTAGE TRIPLERS

Many recent designs of all -solid-state color TV re-ceivers are equipped with a horizontal -output trans-former which develops a much smaller flyback pulsethan that developed in tube -type and earlier solid-statereceivers. This smaller pulse is rectified and stepped upto the required 25-26 Kv by a voltage-tripler rectifierassembly, which also has a tap at the first rectifier in thetripler, to provide about 8 Kv DC for focus voltage. Atypical tripler circuit is shown in Figure 2. The input tothese rectifiers is only 8.5 Kv, so if you intend to de-termine if the rectifier is good by checking input versusoutput be prepared to measure a smaller input pulsethan that found in other types of high -voltage systems.

Because these tripler assemblies are potted, they arcnonrepairable, so it is advisable to locate a source ofsupply, since there are no alternates to the installationof a similar assembly.

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Square -Wave Testingof Audio Amplifiers

By Jack Hobbs

Composition of square waves and how they can beused to pinpoint sources of nonlinearity

In this article, we are not con-cerned with sine- and square -wavetesting as it might be employed byaudio -amplifier design engineersduring "bread -boarding" develop-ment or as it might be used at theend of an assembly line as an OEM(original equipment manufacturer)quality -control tool. Although thebasics are similar, most techniciansare interested only in sine- andsquare -wave testing from the main-tenance and troubleshooting view-points.

This article covers basic square -wave testing techniques, leavingsine waves and Lissajous patterns

for future discussion.Although the principles discussed

in this article are focused on com-mercial -type monophonic stereoamplifiers, they also are applicablefor checking stereo amplifiers. Forstereo testing, a dual -trace scope ora suitable "flip-flop" employedwith a single -trace scope can beused.

The Nature of Square WavesA square wave is composed of a

fundamental sine (sinusoidal) waveplus an "infinite" number of oddharmonics of the fundamental-allof which are in phase. As Fig. IA

Fig. 1-Composition of a square wave. A) Perfect square wave superimposed over some of tnesine waves of which it is composed. B) Perfect square wave superimposed over the "composite"square wave which is formed by the algebraic addition of a fundamental sine wave and the3rd and 5th harmonics of the fundamental.

SINE SQUARE -WAVEOR FUNCTIONGENERATOR AMPLIFIER

BEING CHECKED

SCOPE

DUMMYLOAD

b bb b .

VERTICALINPUT

Fig. 2-Equipment setup for square -wave testing of an audio -amplifier.

and 1B show, the fundamental andin -phase third and fifth harmonicscan be synthesized (algebraicallyadded) into an approximate squarewave. A reasonably good squarewave is composed of the fundamen-tal and about five in -phase, oddharmonics.

Because of their previously de-scribed composition, square wavescan be used to detect nonlinearitieswhich cause distortion in audioamplifiers. Such distortion is causedmostly by defective circuits, out -of -tolerance components or by com-plete failure of one or more com-ponents. Depending on test instru-ment quality, using square waveswe can detect relatively smallamounts of amplifier distortion andmeasure the amplifier's frequencyresponse.

Generator MinimumSpecifications

Although the sine/square-waveor function generator we need forour purposes does not have to meetlaboratory standards, there are cer-tain minimum requirements:

(1) The frequency range shouldbe easily variable from about 20 Hzto 100 kHz or more and have a fre-quency -stability and dial -calibra-tion accuracy of around ±2 or ±3percent from 20 Hz to 20 kHz

(2) Total harmonic distortion(THD) over the same 20 Hz to20 kHz spectrum should be 0.1 per-cent if you service top -grade hi-fiamplifiers; if not, 1 percent THDwill suffice

(3) Amplitude variation of theoutput voltage should be stabilizedwithin ± 1 dB over the frequencyrange from 20 Hz to 100 kHz

(4) Square -wave tilt should beno more than 0.5 percent

(5) Output amplitude should bevariable from about one millivolt orless to 8 or 10 volts

(6) Rise time should be 0.5microsecs or faster

(7) Output impedance should bearound 600 ohms.

With a sine/square-wave or func-tion generator having the aforemen-tioned specs, plus a good TVOMand scope-preferably sensitivedown to DC-we can check out anyaudio amplifier. The amplifier mightbe one from a leased audio installa-tion which is due its annual preven-tive -maintenance check, or it might


be one which has developed a trou-ble symptom, such as distortion.

Straight Forward AudioTroubleshooting

Suppose we deliver a spare 20wamplifier to a customer and pick upan old 20w tube -type unit whichhas a pair of 6V6Gs in the push-pull output and is used mostly forgeneral PA and paging work by aprivate club. The complaint is "lowvolume on mike" and "bad distor-tion."

We remove it from its case,check all tubes and replace one6V6G. Then we connect it for test-ing as shown in Fig. 2. (Note: TheSPDT switch in Fig. 2 is a conven-ience item for periodically quick -checking the function generator out-put.)

Right away we run into a prob-lem. Our particular function gener-ator is an old one, and we can'tlower the output to lmv, which isall we require to drive this high -gain unit through its low-level pre -amp input and driver stages. But wequickly solve this problem as shownin Fig. 3. With the 1000:1 voltagedivider across the generator outputand the TVOM connected to points1 and 2, we set up the generatorto produce a sine -wave output at1 kHz, and then adjust the outputlevel control until the meter reads1 v AC. We use a sine wave insteadof square wave at this time becauseit is easier to measure accurately.(If we could measure down to lmvon our TVOM, then we could checkacross the 100 -ohm resistor insteadof across the complete divider.)

Next, we connect a 16 -ohm, 40w

SINE SQUARE -WAVEOR FUNCTIONGENERATOR

0 00 0

b10011

100K1

TO AMPLIFIERINPUT

Fig. 3-If the output of your sine/square wavegenerator cannot be reduced to the level re-quired for testing or if the output level con-trol is not calibrated, you can use a 1000:1 orsome other ratio of voltage divider as shownhere to obtain the desired level. 1 volt acrosspoints 1 and 2 produces 1mv across the 100 -ohm resistor.

dummy load across the 16 -ohmoutput taps of the amplifier and setthe BASS and TREBLE controls tothe "flat" position. We then con-nect the TVOM across the dummyload resistor and turn up the am-plifier VOLUME control to maxi-mum . . . Let's see, E=PR, 20 x16=320, =17.889v. Leaving theamplifier VOLUME control turned allthe way to the maximum volume po-sition, we flick the meter to the10v AC scale. The meter indicatesthat there is only about 7v ACacross the dummy load. And thereis nothing resembling a sine waveon the scope, just a slightly curvedhorizontal line.

We now look under the chassis,and find a charred resistor andshorted coupling capacitor. Wechange the resistor and capacitor andstart again. We again move the am-plifier VOLUME control toward max-imum volume. At maximum vol-ume, the meter indicates 17.8v.

E2 17.82 316.8P = R - 16 = 16 - 19.8W.

Good enough. The sine wave on thescope is reasonably good but ex-

hibits a little clipping at this level ofoutput. We reduce the amplifier out-put slightly. The sine wave is okaynow. Switch generator to SQUARE20 Hz. Recheck, readjust generatoroutput and amplifier voltage acrossdummy load. The scope waveform we obtain (Fig. 4B) indicatesthat the low -frequency response(LFR) is reduced. We switch to100 Hz. A square wave like that inFig. 4C is produced. We switch to400 Hz. Normal square wave. (Afterswitching to each higher frequency,we check the generator and ampli-fier outputs with the TVOM.)Switch to 2 kHz. A square waveabout like that in Fig. 4D isproduced on the scope. The round-ing off of the leading edge to abouthalfway into the square wave indi-cates that the response falls offaround the 5th harmonic of 2 kHz-or from about 10 kHz upward. Weswitch to 20 kHz. A square wavelike that in Fig. 4E is produced onthe scope, indicating that the high -frequency response (HFR) is re-duced.

We now check the specs in thecontinued on page 59

O

G 7

CI

O tFig. 4-Various normal and abnormal square and sine waves. A) Normal square wave. B) Re-duced low -frequency response near fundamenta frequency of square wave. C) Reduced low -frequency response plus leading phase shift. 0 Reduced high -frequency response. E) Extremereduction of high frequencies plus lagging low -frequency phase shift. F) Extreme reduction oflow -frequencies plus leading low -frequency phase shift. 6) Symmetrical clipping of sine wavecaused by push-pull amplifier operating near overload. H) High -frequency attenuation plus low -frequency phase shift near test frequency. I) Excessive low -frequency gain plus high -frequencyattenuation.


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InterpretingMATV AmplifierSpecs By James E. Kluge

Which specs are important to thetechnician or dealer, and what theyreally reveal about performance

Manufacturers ofMATV amplifiers publishspecifications for twoprincipal reasons: 1) Theypermit the manufacturerto concisely describe theamplifiers performanceand capabilities, and 2)they provide the techni-cian or dealer with ameans to compare andfinally select an amplifierthat will fulfill certain in-stallation requirements.

Understanding amplifierspecifications, then, be-comes the key to choos-ing the right amplifier forthe right job. Poor choicesresult in lost profits, cost-ly call-backs, fewer refer-rals and ultimately, if con-tinued, a general loss ofbusiness.

Amplifier specs fall in-to two general categories:1) physical and 2) elec-trical. Physical specs arethe simplest to under-stand, and include suchthings as overall dimen-sions, weight, finish, color,

connectors, accessories,provisions for mounting,and material of the caseor cabinet.

Electrical specs areequally important, morecomplex, more easily con-fused and, consequently,more difficult to under-stand. Typical of suchspecs are input/output,gain, VSWR, noise figureand effect of gain control.

Input/Output (Fig. 1)Input and output levels

are probably the most im-portant and yet the mostconfusing and least un-derstood specs. This sub-ject is an article in itselfand will be treated in de-tail separately. For now,it is sufficient to say thatamplifiers have a limitedoutput -voltage level. Ex-ceeding this level causesamplifier overload, whichdeteriorates an otherwisegood picture.

The maximum allow-able input level is corn -

AMP MAXINPUT(+20dBmv)

MATVAMP

(25db GAIN)

AMP MAXOUTPUT(+45dBmv)

MAXIMUM ALLOWABLE INPUT - MAXIMUM OUT-PUT - GAIN

Fig. 1-The three MATV amplifier specs illustrated here-input levelgain and output level --arc interdependent. Increasing or decreasing theinput level and/or gain of the amplifier changes the output. The maxi-mum allowable input level can be computed by subtracting the maxi-mum amplifier gain from the maximum output level. Input levels in ex-cess of the computed allowable input will cause distortion and cross -modulation, which, in turn, degrade picture quality.

puted by subtracting themaximum amplifier gainfrom the maximum out-put level (Fig. 1).

The gain of the ampli-fier is either fixed or vari-able. If variable, the max-imum allowable input isincreased by the amountthat the gain is decreased,provided that the gaincontrol attenuates the sig-nal ahead of any amplifierstages. If it does not, thenthe input amplifier mightoverload before the out-put does. Although mostamplifiers attenuate thesignal before it is appliedto the input -amplifierstage, don't depend on it.Always verify whether ornot it does.

One more point aboutgain; Gain controls offera convenience, by allow-ing you to adjust levelsmore precisely. However,every dB of gain designedinto an amplifier costsdollars-don't waste it bybuying an amplifier withmore gain than you needand then throwing themoney away by attenu-ating the gain excessively.If you do, the chancesare good that you couldhave bought a less costlyamplifier in the first place;one that has the rightamount of gain to fit yourrequirements. Some am-plifiers combine high gainand high output capabil-ity. If high output is whatyou need and gain youdon't, you may have to

accept the high gain andpad it down, regardless ofwhether or not it seemswasteful.

VSWR (Fig. 2)

Voltage -standing -wave -ratio (VSWR), or juststanding -wave ratio(SWR), is a figure ofmerit to indicate, in thiscase, how well (or howpoorly) the input/outputimpedances of the amplifi-er have been matched tothe cable or system im-pedance, which usually is75 ohms. Actually, VSWRis the ratio of the maxi-mum to mimimum ampli-tudes of the voltage wave(Fig. 2) and is thereforealways equal to or greaterthan one. Unity VSWR(1:1) is ideal, but is sel-dom realized in practice.

Unmatched impedanceswaste power and producereflections that causeghosts, smears and "halo"effects in the TV picture.Just as standing wavescan appear on an unter-minated coaxial cable, socan standing waves ap-pear if amplifier input andoutput impedances do notterminate in (match) thecharacteristic impedance(75 ohms) of the cableconnected to them.

Amplifier VSWR is atbest a compromise. Othertradeoffs, such as noisefigure, gain and frequencyThe author is a technicaleditor for the WinegardCompany.

STANDING WAVES

-2

VSWR MAXIMUM AMPLITUDE =2_= 2.0:1MINIMUM AMPLITUDE 1

VN. MAX

Fig. 2-Tne voltage standing wave ratio (VSWR) indicates how well im-pedances in a system are matched. The closer the VSWR is to the idealratio of 1:1, the better the impedances are matched and the less arethe chances for ghosts, smears and "halo" in the TV picture


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response, frequently viefor equal or greater im-portance during the courseof designing an amplifier.VSWR is not adjustableafter the design is fixedand is not always uniformin the frequency bandover which the amplifieris designed to operate. Itgenerally is optimizedover the total bandwidthand specified as average -input VSWR. Backmatch,the match seen by thecable looking back intothe amplifier output jack,although important, car-ries less weight than in-put match. Consequently,it is not always specified.Typical VSWR specs forgood amplifiers will varyfrom 1.2:1 to 2.0:1.

Return Loss (Fig. 3)Some manufacturers

prefer to spec the matchof their amplifiers interms of return loss (RL)instead of VSWR. Returnloss expresses the ratio ofincident energy (total) toreflected energy (loss),and is usually expressedin decibels (dB's). Typi-cal values fall between 10and 16 dB. The moredB's the better the matchand the smaller the returnloss. A perfect match hasinfinite return loss. VSWRand return loss give thesame qualitative informa-tion, if you're familiarwith the numbers.

Sometimes the specifi-cations will list "match"and spec the amplifier inboth VSWR and returnloss. However, the returnloss spec is more usefulwhen expressing smallVSWR's between 1.22:1and 1.02:1. Stated interms of return loss, thisis roughly 20 and 40 dB,respectively. A 1:1 (per-fect) VSWR equals an in-finite return loss.

Return loss is a morecommon and useful ex-pression in CATV line

amplifiers. Because theseamplifiers are cascadedapproximately every 0.5mile over several miles ofcable, the VSWR must bekept very small simply be-cause the VSWR accumu-lates rapidly to reach avalue that causes picturedeterioration.

Noise Figure (Fig. 4)The noise figure (NF)

of an amplifier tells theprospective customersomething about howmuch noise the amplifiercontributes in the processof amplifying the signal.In fact, it specifies, indecibels, the differencebetween the signal-to-noise ratio (S/N) at theamplifier output and thatat the input. The signal-to-noise ratio becomesworse as the signal passesthrough the amplifierstages, and the noise fig-ure is a measure of howmuch worse. For exam-ple, if the S/N is 45 dB atthe input terminals of anamplifier that has a NF of5 dB, the output S/N willbe reduced to 40 dB(Fig. 4).

An ideal, noiseless am-plifier would amplify theinput signal and the noiseat the input equally, with-out adding any noise ofits own. In practice, how-ever, amplifiers do addnoise to that which is al-ready being amplifiedalong with the signal; thisincreases the amount ofnoise at the output. Con-sequently, the ratio ofoutput signal to outputnoise (S/N) is reduced.This effect is especiallyimportant in applicationsin which many line ampli-fiers are cascaded. Insuch an application, eachof the line amplifiersshould have low noisefigure, to preserve theover-all signal-to-noiseratio of the system.

Frequently, higher

noise figures are specifiedfor UHF than for VHF(or high -band and low -band VHF). This gener-ally means that the twobands pass through sepa-rate amplifiers or that oneband (usually higher fre-quencies) required addi-tional amplifier stages.The higher the frequency,the more difficult it is toachieve low -noise gain;this is the reason for thehigher NF for higher fre-quencies.

BandpassBandpass specs define

the range of frequenciesan amplifier is designed toamplify. These frequen-cies are usually includedwithin a band that is spec-ified by either the upper -

and -lower frequency lim-its, the TV channels orthe reception bands. Forexample, the bandpass ofa VHF, broad -band, TV -distribution amplifiermight be specified in oneof the following ways:VHF -TV channels, chan-nels 2 to 13, 54 to 88MHz and 174 to 216MHz, or VHF low bandand VHF high band. An-other amplifier might bedescribed as "an 82 -chan-nel amplifier which coversthe VHF low band (54-88 MHz), VHF high band(174-216 MHz) and theUHF band (470-890MHZ)." Such amplifiersmay or may not includethe FM band (88-108MHz). Some may includethe FM band but provide

REFLECTED INPUT MATCH OUTPUT (BACK)

VOLTAGE MATCH

AMPLIFIERSOURCE cr __D LOAD

INCIDENT

75 OHM COAX VOLTAGE SIGNAL

RETURN LOSS - INCIDENT VOLTAGEREFLECTED VOLTAGE

Fig. 3-Return loss is the ratio of incident energy to reflected energyand usually is expressed in dB's. The better the impedances in anMAW system are matched, the smaller the return loss is :and thelarger the dB's).

INPUT

FROMS/N = 45 dB

SOURCE

AMPLIFIER

N.F. = 5 dB

OUTPUTS/N = 40dB 0 TO

INPUT S N - N.F. = OUTPUT S/N

LOAD

Fig. 4-The noise figure (N.F.) of an amplifier is an indication (indB's) of how much internally generated noise the amplifier adds to thesignal during the amplification process. It is computed as shown here.The signal-to-noise ratio (S/N) is an indication of the relative levels ofsignal and noise, and usually also is expressed in dB's. For example, aS/N of 45 dB effectively means that the noise is 45 dB below thesignal level.

40*

10

054

FREQUENCY (MHz)216

.10dB SLOPE or

.10cIB TILTCOMPENSATION

Fig. 5-A coaxial cable attenuates higher frequencies more than lowerones. To compensate for this, the MATV amplifier gain should graduallyincrease in proportion to the frequency, as shown here.

40 I ELECTRONIC TECHNICIAN/DEALER. SEPTEMBER 1974

a fixed or switchable FMtrap for attenuating theFM band if it interfereswith normal TV recep-tion.

Some distribution am-plifiers also are designedto accommodate theCATV bands. For ex-ample, the new WinegardModel DA -825B distri-bution amplifier has aVHF bandpass of 54 to280 MHz which includes,in addition to the VHFlow band (Ch. 2-6), FMand VHF high band (Ch.7-13), the CATV mid -band channels A thru I

(120-174 MHz) and theCATV superband chan-nels J thru S (216-276MHz). To prevent FMfrom becoming a prob-lem, the FM band is at-

tenuated by 18 dB. TheUHF bandpass (470 to810 MHz) includes chan-nels 14 thru 69. UHFchannels 70 thru 83, allo-cated for translator useonly, are not included.

In many catalog sheetsof amplifier specificationsyou will find addition-al specifications whichhaven't yet been men-tioned. They all are im-portant and usually neces-sary, but they generallydon't attract the attentionthat input/output, gainand VSWR do.

ResponseResponse is one of

those specs. It defines howuniform the gain is overthe bandpass of the am-plifier. In some cases, the

Example of MATV Amp SpecsListed here are the specs for Winegard Model DA -825B Broad-band Distribution Amplifier. VHF and UHF sections amplify eachband separately after first separating and then later recombin-ing signals. The VHF section, covering 54 to 280 MHz, includesCAN mid band and super band.

SPEC VHF UHF

Bandpass: 54.280 MHz 470-810 MHz

Maximum Output* +46 dBmV +45 dBmV(per channel) (7 channels) (5 channels)

Gain 26 dB 23 dB

Maximum Input +20 dBmV +22 dBmV(per channel)

Input/Output Impedance 75 ohms

Input VSWR (Average) 1.7:1 1.6:1

Input Return Loss (Avg.) 11.7 dB 12.8 dB

Noise Figure 3.6 dB 6.0 dB

FM Trap -18 dB N/A

Frequency Response +0.25 MHz per 6 MHz Channel

Operating Temperature -30° to 130° F.*For 0.5% Crossmodulation

specification may referonly to the response overany 6 -MHz channel. Typi-cal specs are -±1.0 dBover the bandpass or± 0.25 dB per 6 -MHzchannel. Because you canwatch only one channelat a time, the per -channelresponse will affect picturequality to a larger extentthan response over theentire bandpass, whichmust be equalized for tiltanyway.

Gain ControlAnother minor spec is

gain -control. It specifiesthe range (typically 10-15dB) available to the tech-nician if he wishes to ad-just the gain of the ampli-fier. The adjustment maybe continuously variableor simply a switch. Someamplifiers which areequipped with separateVHF and UHF amplifiershave separate gain con-trols for VHF and UHF.Tilt or Slope, Control(Fig. 5)

Coaxial cable attenu-ates higher frequenciesmore than lower frequen-cies. This produces a fre-quency -response curve thatslopes downward towardthe high -frequency end.Consequently, to maintaina reasonably flat systemresponse, the amplifiergain must have an equaland opposite slope (Fig.5). Slope must be incor-porated into the gain -fre-quency characteristics ofthe amplifiers. When it is,it is called tilt compensa-tion or slope adjustment,and if it is variable, theamplifier will have a tiltor slope control.

An amplifier for whicha slope- or tilt -compen-sating control spec is giv-en has built-in compensa-tion. It is designed to at-tenuate the lower -frequen-cy signals more than thehigher frequencies. Theamount of attenuation

will depend on the lengthand type of coaxial cablewith which it will have tofunction.

Slope controls, beingcontinuously variable, per-mit selection of the exactamount of amplifier sloperequired to compensatefor cable -induced tilt. Theamount of tilt compensa-tion required depends onthe type and length ofcoaxial cable employed inthe system. Fixed tiltcompensation may also bebuilt in. If not, fixed tiltcompensators, like Wine-gard's TC series, may beinserted ahead of an am-plifier, to provide addi-tional tilt compensation.

It has been commonpractice in the MATV(and CATV) industry touse the terms "tilt" and"slope" loosely and inter-changeably. Understand-ably, this can cause con-siderable confusion on thepart of those trying to in-terpret and compare am-plifier specs.

The National CableTelevision Association(NCTA) has attemptedto define more closely thedistinction between thesetwo terms in hopes of re-ducing the confusion whichhas existed.

Tilt, as the NCTA de-fines it, refers to the ac-tual signal levels, as mea-sured, from channel tochannel.

Slope, on the otherhand, refers to the ampli-fier gain from channel tochannel.

If cable attenuation canbe considered negativegain, then line amplifierscan be designed to havepositive slope equal inmagnitude and oppositeto the negative slope ofthe cable or other passivecomponents.

Tilt controls and tiltcompensation referred toin amplifier specificationsaffect the slope of the am -


plifier by a specifiedamount. The tilt to becompensated for wouldbe determined from read-ings taken with a signal -level meter, more com-monly (but incorrectly)called a field -strength me-ter.

Operating TemperatureThe operating tempera-

ture spec simply says thatthe other specs are validwithin a specific tempera-ture range. Depending onwhere the unit is installedand how well ventilatedthe area is, it probablywill never be subjected tothe extremes of the oper-ating temperature spec.

A good operating tem-perature range is -30degrees F. to 130 degreesF. In most TV -receptionareas of the U.S., outdoortemperatures rarely ex-ceed these limits exceptperhaps at the time of theday when minimum andmaximum temperatures

are reached. In otherwords, such temperaturelimits, if ever reached,would not be maintainedfor more than an hour orso and possibly wouldoccur only a day or twoout of a year.

If the amplifier shouldever experience such tem-perature extremes in ex-cess of the limits, the am-plifier would not stopworking, but would mere-ly realize a slight degrada-tion in performance. Inmost cases, the effectwould not even be no-ticed by viewers.

Power RequirementsPower requirements are

relatively standard for theUnited States. Standardline voltage (118v) andline frequency (60Hz)cause about as much con-cern as they would if youwere buying a kitchen re-frigerator. The power con-sumption of most ampli-fiers is minimal (1 to 10

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watts). It is seldom im-portant to know the ener-gy consumed unless youare required to specifyelectrical requirements toan electrical contractorwho must supply yourpower needs. Chancesare, you'll need moreelectrical power for yourinstallation tools (saw,drill, etc.) than the MATVequipment requires.

ImpedanceThe impedance spec of

most commercial MATVequipment is 75 ohms, inand out. The principalreason for using 75 ohmsis that the system com-ponents are interconnectedvia 75 -ohm coaxial cable.Coaxial cable minimizesnoise and interferencepickup as well as simpli-fying installation with re-gard to cable routing andequipment placement. Im-pedances of 300 ohmsusually are encounteredonly in consumer -typeMATV products.

The VSWR or return -loss spec tells us how wellthe amplifier is matchedto the 75 -ohm (or 300 -ohm) impedance. With-out specifying the imped-ance, the match specifica-tion would have little, ifany, meaning.

Line -Amplifier Power[ilk' amplifiers fre-

quently receive their oper-ating power from the dis-tribution amplifier via thecoaxial -cable conductors.The line -amplifier -powerspec helps the techniciandetermine how many andwhat type of line ampli-fiers on the trunk or feed-er lines can be poweredfrom the distribution am-plifier via the cable con-ductors. Voltage, currentand polarity are generallygiven. (For example:-12v, 50 mA.)

Don't Mix BrandsThe preceding covers

all of the MATV ampli-fier specs with whichyou'll usually be con-cerned. However, if you'regoing to mix MATVcomponents from differ-ent manufacturers (apractice not generallyrecommended), you willhave to be particularlyconcerned about the volt-age and current requiredto power line -amplifiers,plus input/output imped-ances, connector typesand mounting provisions.You can avoid a lot oftrouble by sticking withone manufacturer whenyou install a system. Thereare enough variations andsubtle design differencesamong various manufac-turers' equipment to pos-sibly compromise systemperformance.

SPECIFICATIONSfor

MATV AMPLIFIERS

PHYSICAL1

ELECTRICAL

DIMENSIONS MATERIAL OUTPUT VSWRWE GHT FINISH INPUT NOISE FIGURE

MOUNTING COLOR GAIN RETURN LOSSCONNECTORS FUSE BANDPASS TEMPERATUREACCESSORIES PILOT LIGHT RESPONSE POWER

LINE CORD GAIN CONTROL IMPEDANCETILT LINE POWER

SLOPE


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. for more details circle 104 on Reader Service CardSEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER 143

TEST INSTRUMENT REPORT

I

PMAL

J J4

For additional information about this test instrument,circle 900 on the Reader Service Card.

Hewlett-Packard Model1220A Dual -Channel, Triggered -

Sweep Scope by 1. W. Phipps

Versatility, accuracy and ease ofoperation obviously were three prin-cipal objectives the Hewlett-Pack-ard engineers had in mind when theydesigned the all -solid-state Model1220A dual -channel, triggered -sweep scope. And, in my opinion,they have achieved all three objec-tives to a degree that should please

Fig. 1-Close-up view of the most frequentlyused operating controls of the Model 1220scope.

most consumer electronic techni-cians who are skilled enough to takeadvantage of the many features ofthis scope, and who believe that$695 is a reasonable price to payfor them.

SIGNIFICANT FEATURESThe accuracy and versatility of

11,111.100mommialmommouromee

(O ' 0 1q,.

Fig. 2-Close-up1220.

view of rear panel of Model


the Model 1220A is evident fromthe features and characteristics out-lined in the accompanying list ofspecifications. Many of the followingfeatures, which make the scope easyto operate, are not so evident fromthe specifications list, and conse-quently, are elaborated on here:

Logical grouping of color -codedcontrols and inputs-As revealed byFig. 1, the operating controls andBNC-type inputs of the Model1220A are arranged in a mannerwhich makes it easier for the tech-nician to learn and remember thepanel positions and functions ofeach. For example, the BNC-typeinput and controls which relate tothe triggering function are arrangedvertically along the right side of theCRT and, in addition, the trigger -related controls are colored green,for quick "eye-dentification." Con-trols and inputs which are used lessfrequently are on the back of the in-strument, as shown in Fig. 2.

Easy -to -operate controls-Mostof the front -panel operating controlsare either latching -type pushbuttonsor concentric knobs with clearlymarked position indexes. All of theoperating controls are large enoughand are spaced far enough apart tobe easily manipulated even by thosetechnicians who, like me, are "allthumbs."

BEAM FINDER-When pressedin, a nonlatching pushbutton labeledBEAMFINDER, on the front panel bot-tom beneath the CRT screen, re-duces the gain of the vertical andhorizontal amplifiers and resets thesweep to the automatic -triggeredmode so that the trace is broughtback within the viewing area of theCRT screen, regardless of how mis-

adjusted the operating controls are.Then, while continuing to press inthe BEAM FINDER button, the tech-nician can readjust the controls inwhatever manner is required to pro-duce a viewable trace when theBEAM FINDER button is released.

Horizontal trace even in absenceof trigger signal-The trigger systemof the Model 1220A is designed sothat anytime it does not receive atrigger signal within 500ms of thelast trigger input it reverts to anautomatic, nonsynchronized systemwhich continues to trigger the hori-zontal sweep ramp generator. Con-sequently, a horizontal trace is pro-duced even when no input is appliedto the trigger system.

OPERATING CONTROLS ANDRELATED FUNCTIONS

The operating controls are identi-fied numerically in Fig. 3. The con-trols are described in the followingparagraphs in the numerical se-quence in which they are identifiedin Fig. 3.1) LINE-Applies power to thescope.2) INTENSITY-Adjusts the bright-ness of the trace.3) Focus-Adjusts the sharpnessof the trace.4) BEAM FINDER-Brings beam ortrace into viewing area of CRT.When pressed, this pushbutton re-duces amplifier gain to a level atwhich the trace cannot be deflectedoff -screen. By watching the viewingarea as you press this button, youwill be able to tell which otherbeam -positioning controls must beadjusted to bring the trace back on-screen.5) HORIZONTAL POSITION-Adjusts

I I CO.

10

11

11

Il

15

16

..It

-

I (4\*. 3

Fig. 3-Front view of Model 1220 with operating controls and inputsidentified numerically. See text for function of each control.

the movement of the trace fromside to side in the viewing area.When the EXPANDER (horizontalvernier gain control) is being used,this control makes it possible for youto view either end of the expandedtrace or any point between.6) HORIZONTAL TIME/DIV.-Withthe EXPANDER in the calibrated po-sition (fully counterclockwise), themarkings on this dial indicate theamount of time it takes for a spoton the CRT to travel one horizontaldivision. This time ranges from 0.1-microsec to 0.5sec. The setting ofthis control determines the type ofdual -trace display (alternate orchop). For sweep rates of .1 to 50microsec/div., the dual traces areproduced by switching the verticalchannel from one vertical input tothe other during alternate horizontalsweeps of the trace. For sweep ratesof 1 msec/div. to .5sec/div., thedual trace is produced by switchingthe vertical channel from one verti-cal input to the other every 5 micro-seconds.7) EXPANDER-In effect, the EX-PANDER is a horizontal gain vernier.Clockwise rotation allows a selectedportion of the trace to be "stretched"up to 10 times its normal size. Thishas many applications when a par-ticular point on a waveform is of in-terest. (With the EXPANDER out ofthe detent (cal) position, sweepspeeds do not relate directly to theTIME/DIV control markings.)8) TRIGGER LEVEL-This controlmakes it possible to start the sweepat any desired point on the displayedwaveform9) PROBE ADJ.-An internally gen-erated square wave is available atthis "touch point," for adjusting the

Fig. 4-Rear view of Model 1220 with controls and connections identi-fied numerically. See text for function of each.

SEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER I 45

frequency compensation of a low -capacitance probe so that it is com-patible with the input of the scope.10) INT-This pushbutton ispressed to select an internally gen-erated sync signal to trigger thesweep. Pressing this pushbutton re-leases EXT (11) and LINE (12).11) EXT-When pressed, this push-button allows the scope to triggeron an external sync signal applied toEXT TRIGGER INPUT (17).(Pressing this pushbutton releasesINT 10 and LINE 12.)12) LINE-Pressing this pushbuttonallows the sweep circuit to triggeron the line power supply frequency.(The known power source frequen-cy may be used as a handy referencefor investigating line interferenceproblems.)13) TV/NORM-In the NORM po-sition (released), this pushbuttondisables the TV Sync Separator cir-cuit, and the instrument operates inthe normal mode. When pressed in(TV position), the TV Sync Separa-tor is enabled and the oscilloscopetriggers on the frame (100 microsecor slower) or line (50 microsec orfaster) sync of a video signal ap-plied to the EXT TRIGGER IN-PUT (17) or to a CHANNEL A(23) or CHANNEL B (29) IN-PUT.14) -/ +-When this pushbuttonis released, the oscilloscope will trig-ger on the positive -going edge of theapplied signal. When pressed in, thenegative -going edge will trigger thehorizontal sweep.15) x-Y/swP (swEEP)-When setto the SWP position (released), theoscilloscope operates in the normalmode. When set to the X -Y position,the oscilloscope deflects horizontallyby an amount proportional to theamplitude of the signal applied tothe EXT TRIGGER INPUT con-nector (17).16) 1:10/1:1-EXT TRIGGERor X-DEFL signals (17) are at-tenuated by a factor of 10 when thispushbutton is in the pressed -in po-sition. When the pushbutton is re-leased to the out position, there is noattenuation of the signal applied toinput connector (17).18) CHANNEL A POSITION-Posi-

tions trace vertically. Clockwise ro-tation moves the trace up, andcounter -clockwise rotation movesthe trace down.19) CHANNEL A VOLTS/DIV-VOlt-ages on the dial of this switch showexactly what input voltage is re-quired to deflect the beam verticallyone division on the graticule whenthe vernier control (20) is in thecalibrated position (full counter-clockwise). For example, if you ap-ply a 200mv signal to CHANNEL AINPUT (23) and the VOLTS/DIVswitch is set to 100mv, the beamwill be deflected vertically two di-visions.20) CHANNEL A GAIN VERNIER-This control gives continuous varia-tion within the calibrated settings onthe CHANNEL A VOLTS/DIVcontrol (19), and is useful for mak-ing voltage comparisons.21) CHANNEL A GND-When thispushbutton is pressed in, CHAN-NEL A amplifier is grounded andany signal applied tO CHANNEL A IN-PUT (23) is disconnected. In addi-tion, automatic trace is automatical-ly applied to the CRT. This push-button is helpful in establishing azero -volt level during DC measure-ments.22) (CHANNEL A) AC/DC-Deter-mines whether the input signal isconnected to the preamplifier capaci-tively (AC) or directly (DC). Whenthe signal is directly coupled (DC),the instrument has a bandwidth re-sponse from DC to 15 MHz; whencapacitively coupled (AC), thebandwidth response is from 2 Hz to15 MHz.24) CHANNEL B POSITION-Per-forms the same function as (18).25) (CHANNEL B) VOLTS/DIV-Serves the same purpose as (19).26) CHANNEL B GAIN VERNIER-Operates in a manner identical to(20).27) (CHANNEL B) GND-Identicalto (21).28) (CHANNEL B) AC/DC-Identi-cal in function to (22).30) VERTICAL DISPLAY-When twoinput signals are applied (one toChannel A, one to Channel B), thesepushbuttons determine which chan-nel will be displayed on the CRT.

When VERTICAL DISPLAY A is pressedin, the Channel A input signal is dis-played; Channel B input is displayedwhen B is pressed in. When bothpushbuttons are pressed in, both ver-tical input signals are displayed atthe same time. VERTICAL POSITIONcontrols, (18) & (29), position thedisplays, one above the other, to al-low comparison of the two signals.Under these conditions, the signal atChannel A is internally selected asthe sweep trigger. This allows you tocompare the characteristics of thetwo signals.

FRONT PANEL INPUTS17) EXT TRIGGER OR X INPUT-Theinput signal applied to this BNC-type connection may be used to trig-ger the sweep (EXT button (11)pushed in) or it can be used to de-flect the trace along the horizontalaxis of the screen, for X -Y display(x-Y/swP button (15) pushed in).23) CHANNEL A INPUT-Signals ap-plied to this BNC-type connectorare routed through the Channel AVOLTS/DIV controls, (19) and (20),to the vertical amplifier when VER-TICAL DISPLAY A (30) is pushed in.29) CHANNEL B INPUT-Signals ap-plied to this BNC-type connector arerouted through Channel B yours/DIV controls, (25) and (26), to thevertical amplifier when VERTICALDISPLAY B (30) is pushed in.

REAR PANEL CONTROLS ANDINPUTS

These controls and input connec-tions are identified numerically inFig. 4 and perform the followingfunctions:31) LINE SELECTOR SWITCHES-These two switches, which togetherprovide four possible combinationsof settings, set up the power trans-former to operate from one of fourline voltages-100VAC, 120VAC,220VAC or 240VAC.32) POWER PLUG RECEPTACLE-This three -prong receptacle, throughwhich line voltage is applied to thescope, provides grounding of thescope chassis, for safe operation.33) FUSE HOLDER-Accepts stan-dard fuses to provide instrumentprotection in case of current over-


load. A 0.5 -Amp slow -blow fusemust be used when operating from a100v/120v power source. A 0.25 -Amp fuse is used when operatingfrom a 220v/240v power source.34) z-A banana jack that permitsintensity modulation (Z-axis) volt-

ages to be applied. A +5V signalapplied to the Z input will blank atrace of any intensity. This feature ishelpful in determining signal fre-quencies. Maximum input at thisjack is 7 volts RMS.35) GROUND CONNECTION-A con-

venient oscilloscope chassis groundpoint.36) 12v-This telephone -type jackprovides 12VAC for operating thegraticule illuminator of the optionalHewlett-Packard Model 10373Camera Adapter.

SPECIFICATIONSHewlett-Packard Model 1220A Oscilloscope

VERTICAL AMPLIFIER

Modes of Operation:

Single Trace-(Channel A or B)Dual Trace-Channels A and B (automatic selection of

either alternate mode of dual trace, for sweep speedsfrom 1 msec/div. to .5 sec/div., or chopped mode ofdual trace, for sweep speeds from .1 microsec/div. to.5 msec/div.

Bandwidth (either one or both channels):DC coupled-DC to 15MHzAC coupled-2Hz to 15MHz

Sensitivity: 2 mv/div. to 10v/div., in 12 ranges in 1, 2, 5sequenceAccuracy:

± 3 percent on 10mv/div. to 10v/ div. ranges with ver-nier in calibrated position5 percent on 2mv/div. and 5mv/div. ranges

Input Impedance: 1 megohm shunted by approximately30pfTypes of Input Coupling: AC, DC and Grounded.(Grounded coupling disconnects input signal and groundsamplifier input.)Maximum Input: ± 400 v (DC + peak AC)TIME BASE (Horizontal Sweep)Type: Triggered, either from internal or external sources.(Horizontal trace automatically displayed when triggeringsignal not applied.)Sweep Ranges: .1 microsec/div. to .5 sec/ div. in 21 rangesin 1, 2, 5 sequenceSweep Accuracy: ± 4 percent with EXPANDER (horizontalvernier) in calibrated positionMagnification: EXPANDER (horizontal vernier) controlmagnifies sweep a minimum of 10X. (Usable maximumsweep speed is approximately 20 nsec.)TRIGGERING (For Time Base)I ypes:

internal-Approximately 2Hz to 15MHz response withtrigger input signals producing 1 division or more ofvertical deflection

External-Approximately 2Hz to 15MHz response withinput signals of .1vp-p or more amplitude

Line-Internally generated line frequency (60Hz)TV Sync-An internal sync separator circuit automa-

tically separates and provides TV sync triggering at'either frame (.5 sec/div. to 100 microsec/div.) or line(50 microsec/div. to .1 microsec/div.) rates. Separatoralso can be used as a low-pass filter

Level and Slope:Internal-Adjustable to any point on the + or - slope

of the displayed waveformExternal-Continuously variable from + .5v to - .5v

on each slope of the trigger waveform. (With 20dB( 1 : 10) attenuator activated, triggering is variablefrom +5v to -5v.)

EXTERNAL HORIZONTAL INPUTBandwidth: DC to 1MHzSensitivity:

Horiz. Vernier (EXPANDER) Ext. Attenuator SensitivityCompletely clockwise 1:1 100 mv/div.Cal. Position (CCW) 1:1 1 v/div.Cal. Position (CCW) 1:10 10 v/div.(Continuously adjustable between ranges by Expander)

Impedance: 1 megohm shunted by approximately 30pfX -Y Phase Shift: Less than 3 degrees at 100KHz

CRT

Type: 2kv accelerating potential, P31 phosphorSize: 8 x 10 cm (5 inch), internal graticule with .2 sub-divisions on major horizontal and vertical graticule lines

BEAM FINDERWhen pressed in, returns trace to CRT screen regardless ofsetting of horizontal and vertical controls

PROBE ADJUST OUTPUT

2KHz square wave at approximately .5vp-p

INTENSITY MODULATION (Z) INPUT

Input Level Required: +5v, 2Hz to 1MHz blanks trace ofany intensityMaximum Input: 7v RMSImpedance: 1.5 K ohm, approximately

POWER REQUIREMENTSPower transformer input adjustable to Operate from ACline voltages of 100, 120, 220 or 240 VAC (+5 to -10percent), 48 to 66 HzWEIGHT

16.25 lbs.

SIZE7.1 inches high x 12.7 inches wide x 16.1 inches deep

ACCESSORIES FURNISHEDPower cord, blue light filter, fuses for 100/120VAC and220/240VAC operation, operating service manual

PRICE

$695.00

ACCESSORIES OPTIONAL

10:1 Voltage Divider Probe (Model 10013A), $30Rack Mounting Kit (Model 10119A), $55Dual Banana Plug-To-BNC Adapter (Model 10110A), $7

Front Panel Cover, for protection and probe storage (Mod-el 10117A), $18Camera Adapter, (Model 10373A), for Model 123Acamera, Price N/A


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You'll save more money too, bygetting IR's 20% -off -net -pricing on a10 -piece purchase, instead of the10% offered by other brands. And,you're assured of premium quality,because all International Rectifiertransistors are conservatively rated to

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

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 inthis issue.

OSCILLOSCOPE 700

Triggered sweep and aDC -to -15 MHz bandwidth

A solid-state, oscilloscope, Model459, with a 5 -inch CRT and triggeredsweep, is introduced by Simpson ElectricCo. The vertical sen-sitivity of the scopeis continuously vari-able through elevencalibrated steps from10 mv/cm to 20v/cm; bandwidth isDC to 15 MHz, witha correspondingsquare -wave re-sponse of less than5 percent aberrationfor a rise -time of 24nsec. Input impedance is a constant 1megohm, 35 pf. A slim, low -capaci-tance (15 pf) probe is optional. Sweepspeed is adjustable from 0.5 sec/cmto 0.2 iusec/cm in 20 calibrated steps,plus special TV -H and TV -V settings.A 5 X magnifier extends the sweepspeed to 40 nsec/cm. Any one of threesweep modes can be selected; auto-matic, normal or free -running. Hori-zontal sensitivity is 250 mv/cm with abandwidth from DC to 1 MHz. ThreeI-KHz square -wave signal levels -50mv, 0.5 v and 5 v peak-to-peak-areprovided for checking vertical calibra-tion, external circuit testing and ad-justment of the low capacitance probe.The unit accepts standard scope cam-era or light hood and has an illumina-ted 8 cm by 10 cm filtered graticulewith both amplitude and vector index-es. The X and Y vector inputs are onthe front panel, the Z input on therear. The price is $435.

co

DIGITAL MULTIMETER 701

Full multimeter capabilityplus BCD output

A new 20,000 count (41/2 ) digit in-strument is designed to provide fullmultimeter capability plus BCD out-put for systems applications. TheModel 41 has 24 ranges: four acvoltage ranges with 100/2v resolution;five dc voltage ranges with 10µ.v reso-lution; five resistant ranges with 100Mresolution and five ac and dc currentranges with lOna resolution. The TTLcompatible BCD output of reading,function, range and polarity enables


the unit to be used in conjunctionwith printers and/or other digital out-put devices. The instrument is housedin high impact -resistant polycarbonateplastic with aluminum top and bot-

tom covers. The readouts are .515 -in.high and the instrument weighs 6.4lb. Data Technology Corp.

CIRCUIT TESTER

Completely self-containedaudible tester

702

A current -limited ( I mA), audiblecircuit tester which is self-contained isintroduced by Western Technical Prod-ucts. The Safetone Tracer is designedfor rapid tracing or troubleshooting ofcircuits, IC's, semiconductors, logic

components, harnesses, pots, relaysand any other delicate components.Unlike some ohmmeters, test lights,buzzers and high -current testers, it iscompletely safe and cannot degrade ordamage components. While listening tothe tone pitch (which increases withresistance), the user is able to sweeprapidly across circuits with completeeye and body freedom. The unit ispowered by two standard size D bat-teries.

AMPLIFIER CHECKER 703

A combination transistorand tube tester in one unit

A new concept in transistor andtube testing, with both being tested inone simplified unit, is announced bySencore. The tester, Model TC28 Hy-brider, checks transistors, field-effect

continued on next page

HOW TORESTORE TV TUNERS

DIRTY, CORRODED OR GUNKED UPTUNER CONTACTS MEAN SNOWYPICTURES.

IF vOU HAVE TO WIGGLE THECHANNEL SELECTOR TO IMPROVEPICTURE QUALITY, CONTACTS AREDEFINI1EL' POOR.

Now a brand new product solves these problems

TUNED -POWERMIESTUNERS!Just spray TUN -O -POWER on tunercontacts and rotate the tuner. Within5 seconds, contacts will be clear andshiny. Detent action will be smoothas silk. Most important, you'll get sharppictures on all channels, withoutwiggling knibs.

TUN -0 -POWER works so well, (evenon the worst tuners) it's hard to believe.Unless you try it yourself.

Offer to restore the tuner of every set youservice- for an extra charge of $5.00 ormore, depending on how hard it is to getat the tuner. Your customer will appreciatethe extra service because the set will worklike new. You'll improve your reputationas well as you profit margin.

Only TUN -O -POWER restores TV tuners.Try it... you'll love it!

MINCORPORATED1260 CALPH AVE BROOKLYN N Y 11236Our business is improving yours.

CHUATRONICS

.. for more details circle 143 on Reader Service Card


NEW PRODUCTS ...transistors, voltage amplifying tubesand power tubes. The checker is acombination of Sencore's Mighty Miteand the new Cricket transistor tester.It is a tube tester on the left of the testfunction switch and a transistor testeron the right half. Layout is simplified

by running the two separate units intoa common meter. There are no lightsfor short indications, everything is nowread on one large meter. Price is$220.00.

SOLDERING IRON HOLDER 704

Made of high -carbon steelwith chrome plating

Theholder,

Wolo pencil soldering ironintroduced by Wolo Manufactur-

ing Corp., is madeof high -carbon,.120 -inch thicksteel finished withheavy chromeplating. Mountseasily to workbench via a heavy

steel bracket.

SEMICONDUCTOR TESTER 705

Test results are indicatedon an LED readout

Krystal Kits introduces the Jinni -1Semiconductor Tester. The tester willcheck transistors, diodes, SCR's andother semiconductors. Any transistor

(low,tested

medium or power) may beautomatically for type "P" or

SOLDERING +DESOLDERING +

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ELEMENTARY TO ELITEWORLD'S MOST PRACTICAL SOLDER HANDLING TOOLS

meets industries demandswith a COMPLETELY PORTABLE SOLDERING/DESOLDERING/RESOLDERING SYSTEM

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' NOTE. FANOVISION Manual will be sentFREE with purchase of S7.95 (or more) of

any EDSYN Products.Lund one FREE MANUAL to a customer.

-N," transistor gain, open or shortedjunctions, with one press of the testswitch. The test results are indicatedon a solid-state, LED seven -segmentreadout. Price is $49.95.

MOBILE ANTENNAS 706

field tuneablefrom 144 MHz through 174 MHz

The Antenna Specialists Co. announcesa new series of high -band VHF mobileantennas designed for performance un-der demanding fieldconditions. Knownas the ASP -800 se-ries, the antennasfeature 200 w rat-ings, assuring reli-able operation de-spite high RF powerrequirements or ad-verse duty cycles.The whips used on the antennas areheavy .125 -inch diameter, 17-7 PHstainless steel and are taper ground toreduce wind loading. The antennas arefield tuneable to the exact operatingfrequency, from 144 MHz through 174MHz. The coils used are shock resis-tant and are encased in PVC jacketsfor weatherproofing. Electrically, theyare shunt -fed and operate at DCground. The new, low -loss, waterproofband and UHF antennas made by the 111

WINEGARD AMPLIFIEDPRODUCTS PROVEN IN OVER1,000,000 INSTALLATIONS.

CASE IN POINT:WINEGARD SOLID-STATEBOOSTER -COUPLERS.

For quality anddependability in booster -couplers, look to Winegard.You know they're good.Because our solid-state,booster -couplers deliver thebest TV/ FM reception andthe best reliability in theindustry today.Winegard booster -couplerscome in a wide choice ofmodels so each TV systemcan be "customized" forperfect reception. You can

amplify signals for up to fourTV receivers or outlets.

75 and 300 ohmmodels

2 to 4 set capability solid-state circuitry lightning protection

diode three wire ground cord rugged commercial

quality steel cabinet

Best TV products for Best TV reception

V WINEGARDTELEVISION SYSTEMS

VVinegard Como.inv i000 Kirkwood Street Burlington loa.t

. for more details circle 107 on Reader Service Card50 ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974


company. This feature permits easychanges when needed, without theneed for modifications or adapters.

DIGITAL MULTIMETER 707

Employs plug-in IC's,LED's and circuit boards

DigiTec is introducing the Model2210 Digital Multimeter, a full 41/2

digit, bi-polar instrument with push-button convenience. A total of 13

pushbutton -selected measuring rangesare offered, covering the basic func-tions of DC volts, AC volts and resis-tance. DC and AC voltages are coy-

ered in four ranges extending from1.9999 v full scale to 1000 v with ba-sic accuracy of 0.01 percent of read-ing. Resistance can be measured over5 ranges extending from 1.9999 K

ohms full scale to 19.999 megohmsfull scale with accuracy of 0.07 per-cent of reading. The display employslarge, easy -to -read Monsanto MAN 72LED's. The compact, half -rack cases,of extruded and diecast aluminum, areeasily rack mounted in either single ordouble configurations. Price is $525.00.

VOM 708

AC volt and AC amp measurementscan be made almost simultaneously

The Model 265 VOM, introducedby Simpson Electric Co., has a high ACand DC current measuring capabilityand the ability tomake AC voltand AC ampmeasurements al-most simultane-ously. This isachieved by isola-tion of the ACcurrent rangesfrom the voltageranges, plus adja-cent switch posi-tions which allow switching from thevolts range to the amps position. TheVOM is housed in the familiar Simp-son 260 style case, with a single cen-tral range switch and convenientAdjust-A-Vue handle, which doubles

as a meter stand. Accessories includea spring -loaded, retractable probe; ACand DC 5,000 volt probes; a 30,000-vDC high -voltage probe; and a selectionof carrying cases.

PARTS/STORAGE BINS 709

Constructed of corrugated fiberboardand available in eye-catching colors

Parts and storage bins by Kole makesit easier to keep parts, tools, orders, in-voices, mail, etc., separate for quickand easy identification for storage, re-

trieval and inventory. The bins areconstructed of corrugated fiberboardand are available in 32 sizes in a mot-tled white finish and in six sizes in fivecolors. They are designed with a spe-cial cut -down front to enable the userto see in and insert or remove contentswithout taking the bin off the shelf. II

Best Sellers for the Best ReasonsFor AF sine/square waves1. Output from 20 Hz to 200 kHz2. Constant 600 -ohm output impedance3. Level control up to 10 p -p volts min.4. Low total harmonic distortion5. Fast rise time - 150 ns typical6. Three -line power cord for safety7. WA-504B/44D optional price: Only $109.50

To buy the RCA Generators, contact any one of the more than1,000 RCA Distributors worldwide. Or write: RCA ElectronicInstrument Headquarters, Harrison, N.J. 07029.

For RF - 85 kHz to 40 MHz1.Completely shielded including

cable

2. Sweep output @ 455 kHz & 10.7MHz

3. 400 Hz internal modulation(plus external)

4. Crystal calibrated markercircuit (less crystal)

5. Dial accuracy ± 2%

6. Three -line power cord forsafety

7.WR-50B optional price $89.90

RBAElectronicInstruments

Specialists demand the best tools of their trade.... for more details circle 126 on Reader Service Card


DEALER SHOWCASEDescriptions 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 inthis issue.

MICROPHONE 710

Designed for two-waycommunication use by truckers

A noise -cancelling, power micro-phone for citizen's band application,the first designed exclusively for two-

way communicationuse by truckers andthe first amplifiedmicrophone in thisfield, is announcedby The Astatic Corp.The microphone hasan adjustable output.Called the "Truck-er," it achieves itsnoise cancelling abil-

design is sensitive toity because itsspherical shaped sound waves as op-posed to flat waves. Sound waves ofspeech about one -quarter inch fromthe lips are curved and are accepted bythis special microphone cartridge anddiaphragm. Its output is adjustableover a 40 -dB range, with control knobfurnished or with a small screwdriver.

Output impedance is under 5,000ohms, and recommended load is 100ohms and up to open circuit. The unitmeasures 33/4 inch high, 23/8 inchwide, and 1-19/32 inch deep and theweight is 103/4 ounces with cable.

SPEAKERS 711

Blends bookshelf designwith acoustic suspension

Benjamin Electronic Sound Co. intro-duces their Models CS -10 and CS -20bookshelf speaker systems. The speak-er features include an air -suspension -type, 8 -inch woofer system for low dis-

tortion; acoustic "transformer" cabinetdesign, which provides high velocityacoustic energy at the vent slot forlow -frequency control while obtaining

high efficiency characteristics of theback relieved enclosure; and a tweeterwith damping and control of frequen-cy response. Both speakers can be usedwith amplifiers that produce as little as5 to 8 w rms per channel. The powerhandling capacity of the CS -10 is 40 wand that of the CS -20 is 80 w. Theunits are equipped with an L/C cross-over network. The Model CS -10 ispriced at $89.95 and the CS -20 is$119.95.

MATV TAPOFF 712

Isolation can be adjustedbetween 12 and 23 dB

An MATV tapoff whose isolationcan he adjusted to any value between12 and 23 dB is added to the VersatapMATV line of Blond-er -Tongue Labs. TheModel V-4897 Ver-satap eliminates theneed for stockingseveral different val-ues of fixed -isolationtapoffs, and preventserrors caused by theinstallation of incor-rect tapoffs by inex-perienced personnel. The unit mountsin a standard electrical wall box andcan he covered with standard wallplates. The tap output connector is a

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PHONE: (213)478-0095. . . for more details circle 122 on Reader Service Card


Patent 3.778.713

The Wayne Model WT2A

makes YOU moneysaves much timesmakes trouble-shooting easierA new concept in transistor testing

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

age is applied to each semiconductorjunction under test. The resulting DC

voltage is monitored while the rec-tifying junction is passing normal

rated current. Abnormalities areeasily 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 impedancedown to THREE ohms

Performs all of above and more in less thanten seconds

ELECTRONICS5412 Nordling St./Houston, Texas 77022


single, 75 -ohm, F -type female. Amatching F -type male connector issupplied with each tap. Thru-linematch values range from 16 dB atSUB -channel to 10 dB on UHF withthe tapoff set for minimum isolation.At 23 dB isolation, the figure is 22 dBat SUB and VHF frequencies, and 12dB on UHF. Thru-line insertion loss isunder 2 dB at all frequencies and iso-lation settings. Price is $5.75.

SSB/CW TRANSCEIVER 713

A complete desk -top orunder-the-dash/hump-mountedreceiver

A new version of the FPM -300 "Sa-fari" SSB/CW amateur transceiver,

the Mark II, is introduced by the Ha&

crafters Division of Wilcox Electric, Inc.The transceiver, like its predecessor,provides reception of single-sideband(SSB) and continuous wave (CW) op-eration in the 80-, 40-, 20-, 15-, andalso 10- to 11 -meter domestic and in-ternational amateur bands. The trans-ceiver is a hybrid system which usessolid-state and tube circuitry. The unitis intended for both domestic and in-ternational markets and has a built-inpower supply for operation from 117/234 v AC and 12 v DC power sources.Price is $625.

B/W TV POWER SENTRY 714SYSTEM

Magnetic Voltage Regulator Systemnow available in B/W TV sets

Zenith Radio Corporation introducesfour new 19 -inch (diagonal), black -and -white, all -solid-state receivers withthe Power Sentry system of magneticvoltage regulation. The system workswith the solid-state chassis to auto-matically stabilize voltage in the tele-vision set. It reduces stress and excessheat on components from householdvoltage surges and reduces the amountof electricity needed to operate solid-state TV sets. The sets employing thesystem are Models F2070X, F2050J,F2055W and F2060W.

MONITOR RECEIVER 715

Available with specialdealer introductory program

Electrosonics is introducing Electro-Monitor, a complete line of FM moni-tor receivers for professionals and hob-byists, through a complete dealer in-

troductory package. They are designedto monitor any two FM carrier fre-quencies, high or low, at the sametime, to enable the listener to hear si-multaneously police, marine, fire, civildefense br weather or hear both sidesof a duplex communication. The mon-itor receives VHF 25-54 MHz, VHF140-180 MHz or UHF 430-512 MHz


4 Money -saving reasonsto buy EICO's Solid StateTest Equipment.

EICO 242 FET-TVOM. Peak -to -peak

measurements of AC volts and milli -amps. 61/2" meter. 7 non -skip ranges.High input impedance. Low 1 voltscale. DC/AC Multi -Probe. AC or bat-tery operated. Kit $99.15, Wired$129.95.

EICO 330 RF Signal Generator. 5 bandscover a range from 100 kHz to 54 MHz.Calibrated modulation adjustment con-trol. 400 Hz audio output. Provisionfor modulating RF with internal or

external signal source. Kit $79.95,Wired $119.95

EICO 379 Sine/Square Wave Genera-tor. Simultaneous sine and square waveoutputs. Covers 20 Hz to MHz in fiveranges. Low distortion sultzer feed-back circuit. Square wave rise timebetter than 0.1 microseconds. Kit$99.95. Wired $129.95.

EICO TR-410 Triggered Sweep Scope.100% solid state. DC to 10MHz band-width. Sweep synchronized gate out-put. Z -Axis input. Use as vectorscopefor color TV servicing. One probe fordirect and 10:1 measurements. Wired$439.95.

FREE 32 PAGE EICO CATALOGFor latest catalog on Eico Solid State Test Equipment. Automotiveand Hobby Electronics, Burglar -Fire Alarm Systems, Stereo, andname of nearest EICO Distributor, check reader service card orsend 50p for fast first class mail service.

EICO, 283 Malta Street, Brooklyn, N.Y. 11207 EICO

,S-'6,ei---*/1 New Improved

EAVE MOUNTS

FORSUPPORTED MAST

INSTALLATIONSLOTTEDWASHER HE,'LAG SCREWSIMPLIFIESINSTALLATION

TEARDROPSCREW HOLESFOR MOUNTINGEASE

EXCLUSIVE SWIVELMAST SUPPORT

leac Voewl

FORGROUND -UP TELESCOPING

MAST INSTALLATIONSUP TO AND INCLUDING

50 FT. MASTSAvailable in Hot -Dip

Galvanized Steel or Aluminum

WRITE FORFULL DETAILS

Choice of: 30", 48" or 60"c

models (s:ze indicates spread of lower bracket)

SOUTH RIVER METAL PRODUCTS CO., INC.SOUTH RIVER, NEW JERSEY 08882

... for more details circle 144 on Reader Service Card... for more details circle 129 on Reader Service Card

SEPTEMBER 1974, ELECTRONIC TECHNICIAN/DEALER I 53

D

STICKS TO OIL, SILICONE, GREASE.Dust sticks to every protective lubricant used in everytuner cleaner/lubricant on the market today - includingour BLUE STUFF, KLEEN-IT and COLOR RID OX.

We thought it would be a real help if wecould make one that refused to collectdust. *

00IS WHAT YOU NEED LESS OFUp until now, either you had to be super careful whereyou sprayed the tuner cleaner/lubricant you used or itwent all over everything and soon collected dust andcontamination. If you wanted to do the best job - youpulled the tuner, - so you could keep the lubricantaway from sensitive areas.

We thought it would be a help to design atuner cleaner/lubricant just for house calls,one that would make your tuner cleaningon house calls easier, safer and morethorough, one where you wouldn't have topull the tuner to do the best job.

We'veDone Both

And It'sCalled

' Test it yourself, take yourpresent tuner cleaner/lub-ricant, spray a spot on asmooth surface next to aspot of TUNER CARE, letthem both dry and sprinklecigarette ashes over bothspots. Then wipe gently. Theashes will stick to yourPresent tuner cleaner/lub-ricant and won't stick to theTUNER CARE.

AT YOUR

FAVORITE

DISTRIBUTORS

from TECHSPRAY

SPRAY'S DUST HATER

7E9

FOR HOUSE CALLSFOR PROFESSIONALS ONLY

No. 1670-8S Net Wt. 8 Ozs.

where we find solutions for your problems

DEALER SHOWCASE...and features a single on/off volumecontrol, triple pushbutton selector/switch to monitor one, two or bothchannels, adjustable squelch control,four watts peak audio output power,carrying handle, antenna and comescomplete with crystals and one-yearfactory warranty. The special dealerintroductory program features a full -color countertop display, demo unitand sales literature package.

ELECTRIC SIGN 716

Useful for retailers whowant to conserve energy

An electric motion sign is offered toits retailers by BSR. It is part of a pro-

B R McDONALD

AUTOMATIC TURMTABUS I. SURTO

grant to gain in-store point -of -saledominance for BSR turntables. A lightcontrol gives the effect of the recordrotating on the changer. The sign isparticularly useful for retailers whoare reducing night illumination to con-serve energy. The sign produces abright, wide-angle illumination fromits white plastic surface.

UHF ANTENNA 717

Exact replicas of thecar manufacturers' mounts

The Antenna Specialists Co. is intro-ducing a new series of high-perform-ance UHF communications antennasfor security -related operations. Theantennas feature a 5/s -wavelength de-sign that produces 2.5 dB of gain,compared with conventional 1/4 -wavedesigns. Also featured is a special high -conductivity copper -nickel plating

which reduces power losses and deliv-ers more signal. The antennas are rat-ed for use with up to 100 watts ofpower, and stub tuning allows a wide3 -MHz bandwidth for multichanneloperation. Frequency ranges availableare 406-420 MHz and 450-512 MHz.The antennas have been designed togive the exact appearance of conven-

... for more details circle 132 on Reader Service Card54 ELECTRONIC TECHNICIAN/DEALER, SEPTEMBER 1974

nhICO'80 Series

COLOR SPECTRUM'TV/FM ANTENNASrapture the TRUE

.11 COLOR...'43.

MODEL F -89-C54 Elements VHF -UHF -FM

CX-F 89-C 175 OHM)


CX-F-88-C 175 OHM)


CX-F-87-C 175 OHM)


CX-F-86-C 175 OHM)


CX-F-85-C (75 OHM)

VHFFA/1

lj F-81 VMODE

;71

MODEL F -84-V34 Elements VHF -FMCXF 84 V (75 OHM)

MODEL F -83-V28 Elements VHF -FMCXF 83-V 175 OHM)

MODEL F -82-V20 Elements VHF -FMCXF-82 V ( 75 OHM)

MODEL F -81-V14 Elements VHF -FMCX-F-81-V (75 OHM)

Write for Catalog No. 20-658, Dept. ETD -9-74

The FINNEY Co.34 West Interstate Street

Bedford. Ohio 44146


tional broadcast antennas, includingexact replicas of the car manufactur-ers' mounts. The ASP -820, ASP -821and ASP -822 antennas can be usedwith the new Model ASP -829 UHF/AM broadcast coupler. The couplerallows simultaneous use of both theUHF communications system and astandard AM broadcast receiver.

ELECTRONIC PRODUCTS 718

Fast-moving productspacked in a durable cooler

Five Mallory Desert Deals are intro-duced which represent selections offast-moving products packed in a qual-ity, durable IGLOO cooler. The cool-er is free with each selection pur-

chased, and it holds one gallon liquidor six 12 -ounce cans. The five DesertDeals are: popular can type filter ca-pacitors for color TV; 2.5 amp., 1000v rectifiers; Duracell alkaline batteries;PT(' diode/rectifiers; PTC transistors.

8 -TRACK PLAYER 719

Portable unit operates onsix "C" batteries or AC line

Panasonic is introducing the latest intape listening fun with its Dynamic -8

portable 8 -track player. With an eye-catching "detonator" design in red,

confirmed on next page.

T & rVALUE SALE

RAY, I.C.C.. RCA, SYL.FAMOUS MAKE. NEW JOBBER (BOXED) TUBES

80's Off LIST[11 1V2

211V2

3111'23A3

LI 3DB3D 3013

%KS34A5

61W4

61H7

531-1863K46663

6CA8

6E176F016GH8

6GK5

6GF76GJ7

- transfo-merO Piggy Back Antenna

j 2 -Set 7: ohm CouplerD 4 -Set 7: ohm Coupler

GENERAL

EI 3.58 crystals47mfd c, 160V axial leadsElectrical tape 60' by 3'4"19 & 25" Color Boosters21" Color Boosters

5 for $2.705 for $3.555 for $4.555 for $4.405 for $4.955 for $4.755 for $4.355 for $4.305 for $5.305 for $8.355 for $4.405 for $4.205 for $4.405 for $4.305 for $4.055 for $3.355 for $3.555 for $5.955 for $3.405 for $5.20

0 6GU7U 6HA5L. 6HB7L 6HE5D 6HS5D 611V5,_) 61E6Li 61S6

61U180 6KD66KE86K186KZ861868F0712GN717.1Z8232933GY738HE7

5 for $4.705 for $4.305 for $4.855 for $5.355 for $8.75

5 for $10.555 for $9.955 for $8.305 for $5.50

5 for $10.055 far $6.855 for $6.105 for $4.605 for $9.605 for $3.355 for $6.255 for $4.055 for $5.355 for $7.205 for $8.20

I.C.C. ODDBALLS -NEW JOBBER (BOXED )77% OFF LIST

56.7 5 for $3.70 L 6MB8 5 for $4.6051/138 5 for $4.60 Li 12M08 5 for $6.35

_, 6la3 5 for $4.45 Li 16A113 5 for $3.40D 613113 5 for $4.50 21 HB5 5 for $6.20DO 6E1-'4 5 for $10.75 31156 5 for $9.35EJ 6H15 5 for $6.00 36MC6 5 for $11.75

TRANSISTORS XACT. REPLACEMENT (BOXED)80% off UST

r) SK31309 5 for $3.90 D SK3035 5 for $9.15D SK3.018 5 for $2.25 0 SK3036 5 for $9.751:1 SK3320 5 for $2.20 0 SK3040 5 for $3.75D SK3324 5 for $3.15 0 SK3042 5 for $6.20D SK3 )25 5 for $4.50 0 5113054 5 for $4.50C] SK3e26 5 for $3.00 C] SK3I14 5 for $2.40O SK3t27 5 for $5.25 ID 1tep 707

5 for $15.00O Matching Pair PNP NPN (3052) is a

2N4C 77 and 2N4078 4 pairs for $7.80

AUDIOLi 84 Min. 8 Track Irish Tape

60 Min. Cassette tape IrishAC Adaptor 117V to 9V DCExact Replacement NeedlesShure N44 N75 N77 N91

DIODES AND RECTIFIERSRCA Damper Diode Equiv. to:

RCA 20818 $1.95 [ ] RCA 135932 $2.95ITT 6500 PIV Color Focus Rect 10 for $4.00

2.5 anp 1000 PIV IR170 20 for $3.00(1) 66 meg resistors, 53 meg resistor 6 for $2.00

YOKES AND TUNERSY130 Zen. 95-2874 B&W 5 for $25.00Zen. 95-2779 2 for $10.00

Y109 CY954Cb wo/1) - c.2 for $10.00Y107 70 21" Color3 for $10.00

0

Syl. E31 51-29978-1 .. 2 for $15.00Philco Color Fly 3-10132.1 . ea. $1.95UHF-V1IF tuner inc. 3GK5, 5118 ea. $4.95Syl. tLner 54-35055.4 inc.3 transistors 2 for $15.00

ID Curtis Mathes 07A025-000 inc.

f_i G.E. kner 23C225055-1 Inc.. 2 for $7.003610, 6CG8

6U8, 603 2 for $7.00

ANTENNA SUPPLIES- 1.1'.D. t0-14 4 Set Coupler 10 for $10.00

Saxton Signal Splitter 5 for $6.00'-' 72 ohn-300 ohm matching

3 for $3.006 for $2.50

ea. $1.50

ea. $2.95ea. $2.95

5 for $5.005 for $10.00

100 for $150.00$2.00$2.95

10 for $15.0020 for $2.0010 for $3.003 for $11.003 for $11.00

EQUIPMENTTV Tuner Subber Mark 1V $39.95TV Tune' Subber Mark IVA AC DC $49.95TV Master Subber Mark V $144.95

Minimm Orders $35-F.O.B. BrooklynCatalogs $1 -Refundable upon your order

T & T SALES CO.4802 AVENUE K

BROOKLYN, N. Y. 11234Phone: (212) 241-5940

. . for more details circle 131 on Reader Service Card


NO PURCHASE

NECESSARY

IN HICKOK'S $3,60000('IN CASH DISCOUNT CERTIFICATES)

Drawings: Sept. 30 - Oct. 30 - Nov. 30,1974****************Irk*

EACH DRAWING ('IN CASH DISCOUNT CERTIFICATES):

1 1st Prize $200.00 = $200.00 per month5 2nd Prizes 100.00 each = 500.00 per month5 3rd Prizes 50.00 each = 250.00 per month

10 4th Prizes 25.00 each = 250.00 per month

21 Prizes each month $1,200.00 each month

********** +++++++++++++++

EASY TO ENTER:1. See Your Hickok Distributor Salesman.2. Fill Out Entry Form" and Have Countersigned by Sales

Person. (Distributor Salesman Will Submit Your Entry andYour Form Will Be Included Upon Receipt for That Monthand Succeeding Months Drawings. Example: FormsReceived By Sept. 29 Will Be Eligible For All 3 Drawings)

'One Per Service Company/Location.'Face Value of Certificate Redeemable at Hickok Distributor Against Purchaseof Hickok Instruments at Suggested User Net.

Certificates Valid to February 28. 1975


an SWOILL0131

pottont Ptoduct

Fingross A Out

Most /.

4tr-

Start saving the gray bottom flaps withthe GE monogram from GE entertain-ment receiving tube cartons. They reworth valuable awards to independentservice dealers and technicians in afabulous gift bonanza program fromGeneral Electric.

The gift list includes some 43 itemsranging from sporting equipment tohome appliances, from diamond jewelry

to distinctive luggage, from globes andbooks to calculators and Attend -a -

Phones. It even includes the much prizedPolaroid SX-70 camera and AmericanExperience weekend vacations at anyone of 101 prestigious resorts.

BOTTOMS UP!!! Redeem yourflaps by November 30. 1974. Full detailsat your authorized distributor.

TUBE PRODUCTS DEPARTMENTGENERAL ELECTRIC COMPANYOWENSBORO, KENTUCKY 42301

GENERAL ELECTRIC

yellow, or blue, the lightweight playermakes it easy to play 8 -track cartridgesanywhere. The plunger doubles as arotating carrying handle and a pro-gram selector. The tape program num-ber appears in a big easy -to -read win.:dow. All the user has to do is slide inan 8 -track cartridge and adjust thevolume control. The solid-state playeroperates on six "C" size batteries andcomes complete with an AC cord forhousehold use. Price is $39.95.

CAR STEREO DISPLAY 720

With built-in power supplyand a switching system

Channel Master is introducing the one -stop Car Stereo Center, an illuminatedmerchandising rack which displays thecompany's auto radios, 8 -track autoplayers and speakers. The display, de-signed to stand on either floor or

CAR STEREO CENTER

counter, comes with built-in powersupply and a switching system thatpermits a customer to compare stereoand 4 -channel sound, up to nine dif-ferent radios and tape players, and avariety of speakers. The display, mea-suring 36 inches wide by 40 incheshigh, is made of vinyl -covered flakeboard, and features pilfer -proof prod-uct mounting.

COLOR TV REPLACEMENTPICTURE TUBE 721Uses the latest X-radiationattenuation glass bulb

The RCA "Colorama A" line of to-tally remanufactured color televisionpicture tubes, with used X-radiationattenuation glass, latest all -new rareearth phosphors and a new electrongun assembly, is introduced by RCAElectronic Components. Seven tube typesthat cover 92 percent of the industrycolor picture tube replacement salesare included in the line. Three of these


The rightreplacement, fasterwith

SERVICE

KITS

from your CentralabDistributor

KITS AVAILABLE:

Fastatch' Controls Miniature Wirewound Controls

Miniature Trimmer Controls

Axial Lead Electrolytics Radial Lead Electrolytics General Purpose Capacitors

High Voltage Disc Capacitors

Packaged Electronic Circuits

KIT FEATURES:

Rugged steel frames with highimpact plastic drawers. Stackable or wall mounted.

Portable, with convenient handles.

All contain assortment of themost popular and widely usedCentralab components.

All control kits include latestedition of H. W. Sams ReplacementControl Guide.

All components are functionallyarranged in drawers by value,type, etc.

All drawers are pre -labeled clearlyshowing contents.

All kits are completely set up,ready to use.For complete details,see your Centralab Distributoror send for descriptive brochure.

DISTRIBUTOR PRODUCTS

mainfiCENTRALABElectron cs OwtsionGLOBE -UNION INC.

5757 NORTH GREEN BAY AVENUEMILWAUKEE. WISCONSIN 53201

tube types are Matrix tubes. The newtube line carries a free 18 -month in -boarded "factory" warranty, with anoptional 12 -month add-on warrantyfor a nominal charge.

STEREO TURNTABLE 722

Features a DCdirect drive motor

in America, Inc., introduces a direct -drive turntable designed to producebetter standards in record reproduc-

tion. It features a vibration -free, DCdirect -drive motor that results in awow and flutter of only 0.05%WRMS, and a S/N ratio of betterthan 60dB. The dynamic balanced armis of special low mass, low friction de-sign for better tracking and CD -4 re-production. The motor and I2 -inch diecast aluminum turntable are mountedin a specially designed, resonance -free,heechwood base. The Model .1L -B44unit has a hinged dust cover and isstyled to compliment any decor. Priceis $349.95.

TELEPHONE ANSWERERDISPLAY 723

Three-dimensional, with self -selling demonstration tape cassette

BSR has introduced a three-dimen-sional sight and sound display for deal-

ers of their Phone Butler telephoneanswerer. The display features a three-dimensional cut-out of the British


DELUXE DIGITAL COLOR

CONVERGENCE GENERATORNOW AT A PRICE EVERYONE

CAN AFFORDROCK SOLID PATTERNS

ALL IC COUNTDOWN CIRCUITS

QUARTZ CRYSTAL OSCILLATORS

2 FULL YEARS' WARRANTY

etteF-gEMEPa TON

MODEL

SG -200$7995

reg. $99.95

10 Patterns: Full & Gated Rainbow, 4Crosshatch, 4 Dot Die Casted Ve" Alu-minum Case.

4

C.FN,PA,r,P

GM a U3J=.

MODEL $5995SG -150 reg. $74.95

10 Patterns: B&W Bars, White Field, 4Crosshatch, 4 Dot.

Heirs, rar, fronh, Inc.

MODEL

SG -100

ONLY

$4795reg. $59.95

2 Patterns: 20 x 16 Crosshatch, 320Jots, weight only 17 oz.

SPECIAL PRICE LIMITED TIME ONLY

FULL 15 DAYS MONEYBACK GUARANTEE

ELENCO ELECTRONICS INC.8144 W. North Ter., Niles, III. 60648312-825-5797 MODEL SG -

D My check or money order enclosed.

COD-Add $2.50 mailing & handling

NAME

ADDRESS

CITY STATE ZIP

DISTRIBUTORS' INQUIRIES INVITED

... for more details circle 145 on Reader Service Card. . for more details circle 109 on Reader Service Card

SEPTEMBER 1974, ELECTRONIC TECHNICIANIDEALER 57

SUPERSPECIALS

NEW JOBBER BOXED TUBES

OVER 77°. OFF

1B3 5 for $4.90 6H115 5 for $6.351V2 5 for $3.00 6HV5 5 for $11.252AV2 5 for $3.95 6106 5 for $5.603A3 5 for $5.10 61E6 5 for $11.153AT2 5 for $4.90 6156 5 for $9.303GK5 5 for $4.85 61U8 5 for $5.503HA5 5 for $4.80 6KA8 5 for $6.104BZ6 5 for $4.70 6KE8 5 for $7.605GH8 5 for $5.90 6KM6 5 for $11.40SAX4 5 for $4.80 6KN6 5 for $13.206AY3 5 for $4.75 6KT8 5 for $6.756BK4 5 for $9.30 6K18 5 for $5.056C53 5 for $4.90 6186 5 for $10.756CG8 5 for $5.40 8F07 5 for $3.706006 5 for $6.75 12AX7 5 for $3.406DW4 5 for $4.65 12GN7 5 for $6.956EH7 5 for $4.75 171Z8 5 for $4.506E17 5 for $4.50 21GY5 5 for $5.806FQ7 5 for $3.70 23Z9 5 for $5.4565F7 5 for $6.60 311.06 5 for $11.106GH8 5 for $3.85 33GY7 5 for $8.006517 5 for $3.75 38HE7 5 for $9.206507 5 for $5.25 38HK7 5 for $9.006HA5 5 for $4.70 42KN6 5 for S12.85

TUNERS -TUNERS

SYLVANIA 1RANS. 54-35055-2SYLVANIA TRANS. 54-29331-3Gen. Elect. Trans. EP 86X153 Asst'd Tuners (TUBE TYPE)

COLOR FLYBACKS

RCA 136640RCA 137545PHILCO 32-10132-1

COLOR YOKES

DY 95ACY 109 (UNIVERSAL)1AP YOKESY107 21" CRT (ROUND) UNIV.Mag. 361340 Y133 (Adm)100-6GH8 (BRAND NAME BOXED)100-HEP-170-2.5 Amp. 1000 Ply5-13.5 KV Focus Rectifiers50 Asst'd MALLORY Controls100 Asst'd Carbon Resistors50 Asst'd W.W. ResistorsColor Crystals 3.58 Mhz10 HV Anode Leads50 Asst'd Terminal Strips10 RCA Phono PlugsSHUNT REG. HOODS100 Asst'd MICA Cond.Audio Output Xfmrs70% Color Boosters90°, Color BoostersCRT Harness Color SetsMONO TONEARMS TURNOVER CART.5 Asst'd STEREO CART. (BULK)6 Antenna Clothespins6 Coaxial "F" ConnectorsRMS-2 Set CouplerRMS-4 Set CouplerCONV. ASSEMBLY 70%-21" CRT10 AC INTERLOCKS10 AC INTERLOCKS (POLARIZED)SLIDE SWITCHES

$4.95$4.95$4.95

$11.00

$5.95$5.95$3.95

$6.95$4.50$5.95$3.95

$64.95$12.95

$3.00$2.59$1.69$2.59

4 for $2.00$1.29$1.39$1.00

2 for $1.19$1.19

2 for $1.003 for $11.953 for $11.95

5 for $1.00$1.39$6.95$1.19$1.19$1.89$2.79$1.00$1.00$1.00

10 for $1.00

MINIMUM ORDER $15.00SEND FOR FREE CATALOGTUBES UP TO 80% OFF

SEND CHECK OR MONEY ORDER

TV TECH SPECIALSP.O. BOX 603

Kings Park, L.I., New York 11754

DEALER SHOWCASE...butler that the company employs in itsTV commercials and ads. Includedwith the display is a demonstrationcassette that prospective customers canlisten to in the store. To learn the fea-tures of the answerer, the customerpresses the on button and the unit sellsitself. Price is $99.95.

VHF CABLE LOSS EQUALIZER

Performs the functions of 724amplifier and tilt control

A VHF Cable Loss Equalizerwhich compensates for tilt loss char-acteristics over a frequency range of10 MHz through 225 MHz is an-nounced by Q -Bit Corp. The device, des-ignated Model 4200, reduces the costof MATV and CATV installations byperforming the functions of an ampli-fier and a tilt control, both of which

o

typically are required for linesation. The passive unit compensatesa 6 -dB tilt between channel 2 andchannel 13, correcting for loss over200 feet of RG-59 or approximately300 feet of foam RG-6/U. The Model4200 and companion Model 4205,which provides 1 -amp power passing,provide impedance matching from 5

MHz to 300 MHz. Price is $4.50.

MOVING?Be sure to let us know your new address.Please enclose a complete address labelfrom one of your recent issues.

FREE ALARM CATA 0Full line of professional burglar andfire alarm systems and supplies. 96pages. 450 items. Off the shelf delivery,quantity prices.

6(k mountain west alarmW 4215 n. 16th st., phoenix, az. 85016


Mow

FREE CATALOGHARD -TO -FIND PRECISION TOOLSLists ',are than 2000 items-pliertweezers, wire strippers, vacuum Oyster.relay tools, optical equipment, tool kitsand cases. Also includes ten pages ofuseful "Tool Tips" to aid in tool selection.

ES+EC NB EC Iv' TOOLS

4117 N. 44th Stremt, Pheen, Arm. 850111

ALL NEW FROM ENDECO

Exclusive new safety lightshows when power is on

MODEL 510 $15.95 NET

Three-way on -idle -off switch Operates at40w; idles at 20w for longer tip life 6 tipsizes available to handle any job . Cool, un-breakable polycarbonate handle Burn -re-sistant neoprene cord Exclusive new bracketinsures alignment, prevents damage 81/2"

long, 31/2 oz Also soldering irons and solder-ing/desoldering kits.

See your distributor or write .

CO )5127 EAST 65TH ST.INDIANAPOLIS,INDIANA 46220PHONE 317/251-1231

.. for more details circle 110 on Reader Service Card

a-26yearPRICE

FREEZEIn spite of rising production costs, labor,materials, freight, etc. Electronic Chem-ical still maintains the same high quality

.and low price as in our very first year.Volume Control and Contact Restorer

- -

For special attention to vol-ume controls, push buttonassemblies, band switches,relays and other electricalcontacts.

AM.

NTuner

Tonicruin IP

For Color and B/WTuner TonicCleans and lubricatestuners (incl. wafertype) -- economical,,a little does a lot.No -Noise productsguara Meed non-flam-mable, no carbon tet,non-toxic -safe forplastics.

' Super Spray BethDissolve and flush awaygrease, dirt, oil and ox-idation. Used for mag-netic heads, computers,relays and switches, Tel& Tel equipment, switch-boards and switchingdevices, record changers,timers, automotive andaircraft equipment, print-ed circuit boards.

Often imitatedbut never duplicated

Other "No -Noise" Products:.1044

-Super Lube Frigid Air-Tape-Reco Head Cleaner

Nnotsrr31 uNIE

CONTROLelvo=olovCONTACTRESTORER

AMORAL -

ELECTRONIC CHEMICAL CORP.813 Communipaw Avenue Jersey City, N. J 07304

. . . for more details circle 136 on Reader Service Ca d. . . for more details circle 118 on Reader Sery ce Card

. for mote details circle 108 on Reader Service Card58 1 ELECTRONIC TECHNiC,'!AN DEALER, SEPTEMBER 1974

Square Wave Testing...continued from page 33

service manual for the amplifier. Itsays: "FR essentially flat from200 Hz to 10 kHz." So, the amplifi-er has checked out close to normal.Not bad for voice intelligibility.That's what it was primarily de-signed for. The clipping observednear full load was disregarded be-cause the amplifier seldom runs atmore than 15 watts in its presentapplication. We will check it againafter it is operated for a few hours.Interpreting DistortedSquare Waves

Like all symptomatic analyses inelectronic troubleshooting, thereare few clear-cut, absolutes-withthe exception of a blown pilotlamp. The most expert audio tech-nicians employing the techniquesdescribed previously maintain volu-minous notes and waveform draw-ings on every job. There are innu-merable variations of distorted sineand square waves. If all are record-ed along with notes about the re-lated symptoms and faults, you willsoon accumulate a wealth of valu-

4.111111M,

able information for on-the-jobdaily reference. Moreover, thesine/square-wave (or function)generator and scope can be used asa point-to-point signal injecting andindicating combination for check-ing key portions of all amplifierstages under passive (nonoperat-ing) conditions. It should be under-stood, however, that sine waveswill pass through nonlinear ampli-fiers with little, or no, perceptibledistortion, whereas a square wavewill be distorted. For this reason,the use of sine waves is usuallylimited to amplitude measurementsin these particular procedures.

Passive stage checking requiresa scope with sensitive, calibratedvertical deflection, usually between10 and 20mv PP deflection overone centimeter. When an overallfrequency -response check of anamplifier under dynamic (normaloperating) conditions revealssquare -wave distortion or attenua-tion in any area of the amplifier'sspecified passband where distortionor attenuation is not supposed tobe, switch the amplifier off and feed

Franatk MJ-195

square waves in at key input points,while moving the scope from point-to-point following the injected sig-nal. After isolating a fault to a par-ticular area, you can then isolate adefective RC network or a faultycapacitor in the network.

When checking small -signal tran-sistorized circuitry under passiveconditions, use the lowest possiblesquare -wave injection -signal volt-age that will produce a useablescope indication.

The distorted square waves inFig. 4 are only a small, generalizedcollection of the almost infinitevariety encountered during audioamplifier testing.

MASTER TEST RIGFOR TUBE AND SOLID STATE SERVICING

30 KV CAPACITY METAL CABINET SPEAKER BUILT IN

kid& Ilk

less 19" picture tube

HIGH VOLTAGE METER STATIC CONVERGENCE FRONT PANEL CONNECTIONS

2245 Pitkin Ave..Brooklyn.N.Y.11207,FREE' Adaptor Quick Relererce Chart

DISCOUNTTEST

EQUIPMENTSPECIALISTS

HICKOK

SEIVCCDFRE RCil

COMPLETE LINE OF ELECTRONIC SUPPLIES

ICC/Mullard & Raytheon TubesTelematic Test Rigs

FREE CATALOG'OTATIONS ON REQUEST

FORDHAMRadio Supply Co., Inc.

5E:8 Mums Ave., Bronx. N.Y 104!,1Tel (2121 585 0330

... for mole details circle 112 on Reader Service Card

Last year, 7.000 peopledied because theyfound excuses for notwearing seat belts.

This year, our ads couldtake away thoseexcuses and savequite a few lives.

Unless the ads don'tfind their wayinto your magazine.

Then, what's your excuse?

1974. ELECTRONIC TECHNICIAN/DEALER 59. for more details circle 133 on Reader Service Card

SEPTEMBER

TWENTY - ONE YEARS AGO

WE PRODUCED THE FIRST

SUPERIOR

ELECTRONIC CONTACT CLEANER

We Named It "WISSH"

4Y.1.4111....<

.11, "A.<

-dr

WISP.

Cantr).4"0, r, d

lt IVI.1

O

Almost from t s IntroductionWISSH tecame 111i3 standardof the industry.' a straightcontact cleaner IT ,UST CAN'TBE BEATToday we prociuw whole fam-ily - - A BIG FAMILY - - ofthemical prodc.cte -o- the elect--onic industry_ T-iev, too, havebecom33tandaicis it the industry.For e<ample tzle! our SUPEFWISSI- - It clean: aid lubricate.;like notling eve- ha; .. and hasyet to harm anyone's tuner.

-1r ""1"-

Mcre tan two ce_3actes ago aLetter fPatent was panted onWISSH. Today aViough the sir -vice industry of it mostly inaerosol tens, Uncle Sam u;eshurdreds of gal.ois in liquid'orn- to service -a wile varietyof electro-Tiechanical EquipmentWISSH has beer ass gned -.S.G3ir3-meit urnber zSN6853 - 973 - 31.Z and SUPER

FSN 66F) - .c35 - 634VI.e'-e !coda pr .id of oc.r olcreliables. We coon-nen:I t-iemto your attent on-,

WORKMAN 1,rtti,Co1 IPM TECIPFJLOG, 12.0

IBO< 33F8 SARASOTA. FLA 33578 FFODUC-S, NC.

READERS

SERVICE INDEX

ADVERTISER'S INDEX

101 13 & K Division Dynascan Corp. .17102 Blonder -Tongue 1-2

103 Book Club-Tab Books 34-37145 Centralab Distributor 57104 Channel Master 43105 Channel Master 10-11143 Chemtronics 49106 Data Technology 42107 Edsyn, Inc. 50144 EICO 53108 Electronic Chemical 58109 Elenco Electronics 57110 Enterprise Development Corp. 58111 Finney Company 55112 Fordham Radio Supply Co. 59113 GC Electronics 31

General Electric-Tube Division 56GTE Sylvania Consumer Renewal 3, 7

114 Heath Company 14115 Hickok 56116 International Components 59117 International Rectifier 48118 Jensen Tools & Alloys 58119 Jerrold Electronics Corp. Cover 3120 Kay -Townes, Inc. 27121 Leader Instruments Corp. 8122 LPS Research Labs 52123 Mallory Distributor Products 5124 Mountain West Alarm 59141 Perma Power 12125 PTS Electronics, Inc. Cover 2126 RCA Electronic Instruments 51

RCA Picture Tubes 39127 Rohn Manufacturing 15128 Simpson Electric Co. 13129 South River Metal Products Co. 53130 Sprague Products Co. 9131 T & T Sales Co. 55132 Tech Spray 54133 Telematic 59134 Triplett Corporation Cover 4135 Tuner Service Corp. 29136 TV Tech Aid 58137 Wahl Clipper Co. 8138 Wayne Electronics 52139 Winegard Television Systems 23142 Winegard Television Systems 50140 Workman Electronic Products 60

NEW PRODUCTS

700 Oscilloscope 48701 Digital Multimeter 48702 Circuit Tester 49703 Amplifier Checker 49704 Soldering Iron Holder 50705 Semiconductor Tester 50706 Mobile Antennas 50707 Digital Multimeter 51708 VOM 51709 Parts/Storage Bins 51710 Microphone 52711 Speakers 52712 MATV Tapoff 52713 SSB/CW Transceiver 53714 B/W TV Power Sentry System 53715 Monitor Receiver 53716 Electric Sign 54717 UHF Antenna 54718 Electronic Products 55719 8 -Track Player 55720 Car Stereo Display 56721 Color TV Replacement Picture Tube 56722 Stereo Turntable 57723 Telephone Answerer Display 57724 VHF Cable Loss Equalizer 58

TEST INSTRUMENT900 Hewlett-Packard Model 1220A

Sweep Scope 44... for were details circle 140 on Reader Service Card


1548ZENITHTV Chassis16EB12X, ZX

WIDOMMAI r.CS5 °I-

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ELECTRONIC "7 a -W=1TECHNICIAN/DEALER

SEPTEMBER 1974COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

150- 3 2 MODULE ASSY1 F

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VIDEO 8140SECOND I F COLLECTIONVIDEO OUTPUT

4.9.C. OUTPUT3111) I 11 ALIGNMENTSOUND DISC OUTPUTVIDEO DRIVER OUTPUT311) 1 limn

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SYMBOL DESCRIPTION ZENITH PART NO.

C220A - 200o f electrolytic cap 175v 22-7201C220B- 150o f electrolytic cap 175v 22-7201C220C - 50of electrolytic cap 175v 22-7201R215 - varistor 63-5440F1414 - 3K control AGC level 63-10148R702A - 50K dual control vert size 63-10225-01R70213 - 500 a dual control vert lin 63-10225-01L203 horiz hold coil 95-3100T201-- audio output xformer 95-3120T202- vert output xformer 95-3094T203 - yoke assembly 95-3126T205 - sweep xformer S-94397T206 - power xformer 95-3131T1102 -quad xformer 95-2789CR202 - high voltage rectifier 103-239-021C1101- integ circuit 221-48F201 -fuse 1.5a 136-29CB201 - circuit breaker 1.2a 85-976-03

COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN 'DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

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COPYRIGHT 1 974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 551302

1547SONYColor TV ModelKV-1 500

ELECTRONIC /-/ farZTizaTECHPSCIAN/INALER

SEPTEMBER 1974COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

= 1.2 Vp-p (Horiz.) 1.0Vp-p (Horiz.) 8.0 Vp-p (Horiz.)

1110

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0 15VP-p (3.58 MHz) 5.0 VP -P (Horiz.)

5.5 Vp-p (Horiz.)

7.0Vp-p (Horiz.)

3.7 Vp-p (Horiz.)

SYMBOL DESCRIPTION SONY PART NO.

L405 - 3.58MHz coil wave trapT207 -4.5MHz xformer wave trapT304 - xformer burst amp1502- xformer horiz output1503- xformer vert osc ...1801 - flyback xformer assemblyT902 - xformer sound output

4.0 Vp-p (Horiz.) 8.4 Vp-p (Horiz.)

6 re 1,

1.2 Vp-p (Horiz.)

5.5Vp-p (Horiz.) 3.0 Vp-p (Horiz.) 11Vp-p (Horiz.)

240 Vp-p (Horiz.) 5.0Vp-p (Vert.)

520 Vp-p (Horiz.)

10Vp-p (Vert.) 110 Vp-p (Horiz.)

38 Vp-p (Horiz.)

L208

La 13

La 12

Loll

Lo10

La 9

La 8

0 5.4 Vp-p (Vert.)AGC

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011111Xr-

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VR202- 330-B sound reject 1-222-515-001.409-193-00 VR301-1 k -B ACC control 1-222-517-001-409-146-00 VR302 -4.7k- B hue adjust 1-222-518-001-405-372-00 VR501 -20k-B horiz frequency 1-222-725-001-439-113-00 VR503- 10k -B horiz size 1-222-512-001-435-008-00 VR505 - 50- B horiz centering 1-223-017-001-439-121-00 VR506- 10k -B vert size 1-222-512-001-427-307-00 VR507 - 10k -B vert lin 1-222-512-00

Al111111111111111111111111111...

0.18Vp-p (Vert.) 6.6Vp-p (Horiz.)

0"

1,004C1\,,,00 ' y1

166

120 Vp-p (Horiz .I 100 Vp-p (Horiz.)

7.0 Vp-p (Vert.) 10Vp-p (Vert.) 115Vp-p (Vert.)

Lb 13

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VR901 - 1k -B picture control 1-222-363-00VR902 - 20k- B vert hold 1-222-388-00V R903 - 50k- D volume control 1-222-686-G0VR904 - 20k- B brute control 1-222-388-00VR905- 3k -U hue control 1-222-387-00VR906 -500-B color control 1-222-386-00

deflect yoke 1-451-081-03CB -1.6a circuit breaker 1-515-168-00

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COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH, MINNESOTA 55802

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COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH. MINNESOTA 55802

1546SYMBOL DESCRIPTION ADMIRAL PART NO.

ADMIRALColor TV Chassis3K19

SEPTEMBER 1974

FL AT.DOT OA TAO

AMJACENT

19 PIN I

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L306 - 4.5MHz trap 72A367-1L501 - horiz hold coil 94A351 1L701 - 3.58 trap 72A414-1L702 - 3.58MHz peaking coil 72A364-1

75A155-1 T100 -power xformer 80A116-375A155-1 T101 -CRT filament xformer 80A119-175A155-1 T102 - vert output ',former 79A153-4

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1545SONYColor TV ModelKV-5000

SEPTEMBER 1974

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COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER EAST FIRST STREET. DULUTH. MINNESOTA 55802

ELECTRONICTECHNICIAN/DEALER

2i-Tff1=Lis'COMPLETE MANUFACTURER S' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

SCHEMATIC NO. SCHEMATIC NO.

ADMIRAL 1546 SONY 1547Color TV Chassis 3K19 Color TV Model KV-1500

GENERAL ELECTRIC 1544 ZENITH 1548TV Chassis T-6

SONY 1545Color TV Model KV-5000

SYMBOL DESCRIPTION GENERAL ELECTRIC PART NO.

R901 -2.2M Y,w 10% ES14X53C901 -22000 10% 25v ES31X37L204- IF ES36X72L206 - filter ES36X73L207 - filter ES36X74L701 - horiz filter ES36X48L702 - horiz filter ES36X78T701 - horiz osc ES35X5T702 - horiz drive ES51 X4T703 horiz output 'dormer ES77X11T901 -power 'former ES88X2

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SEPTEMBER 1974

TRI2258770 P

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COPYRIGHT 1974 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55602

I MAIL COUPON TODAYNim -

Please send me a Jerrold GIFTORAMA Catalog Iand one free GIFTORAMA Point.

yCity

Name

Address

State & Zip

Mail to: Jerrold Electronics CorporationP.O. Box 350 Horsham Pa. 19044 ETD -5

Professional Antenna Installers... cut yourself in

FreeGiftsfromJerrol

More and more professional installers are choosingJerrold top -rated antennas, preamplifiers, accessories andINS-ANT MATV equipment. If you are one of the many prosusing Jerrold equipment, this exciting new incentive programwill give you the opportunity to gain free gifts as our wayof saying "Thank You." If you are not yet using theJerrold line, these premium gifts are an incentive for youto try Jerrold products. For complete details on thisprogram, contact your participating Jerrold distributoror mail the above coupon today.

El

on.

JERROLDElectronics Corporation P.O. Box 350 Horsham, Pa. 19044a GENERAL INSTRUMENT company


The reader that canstayon, and on, andon.The 603.The price of the Model 603V -O -M is only $173.

The one V -O -M you can forget aboutforgetting to turn off. The incredibleModel 603 FET V -O -M withexclusive Triplett Micro-PowerTMdraws only 10 uA, can stay onindefinitely without impairing per-formance. Ideal wherever frequenttest changes, interruptions, distrac-tions-or gremlins-keep your V -O -Mworking when you're not.

Truly outstanding features:Exclusive Triplett Micro -Power (TM PT") providesbattery life in excess of a yearfor carbon batteries with unitleft on continuously 24 -hoursa day.Low -Power Ohms (LPYT")-6ranges with 70 mV powersource for in -circuit measure-ments without damage tocomponents.FET V -O -M with PatentedAuto-Polarity-convenientand time -saving, always readsup scale.

Accurately measures electric andelectronic circuits on productionlines, in quality testing, during main-tenance, in service shops and oncalls, in the laboratory or classroom,in the field.

One range selector switch operatesthe unit. One probe handles allfunctions-AC, DC, MA, Ohms-anda simplified scale utilizes only 4 arcsfor all 44 ranges. The Low PowerOhm circuit permits fast circuitmeasurements without biasing semi-conductor device junctions. The

Model 603 also has a unique,Patented Auto -Polarity circuit: pusha button, measure either plus or minusvoltages without switching leads.Make very fast voltage checks wherepolarity is known or doesn't matter.

For more information or a freedemonstration, call your Triplettdistributor or sales representative.

For thenearest

SOLID STAIR

V -O -M

name of the representativeyou, dial toll free (300) 645-

9200. New York State, call collect(516) 294-0990. Triplett Corporation,Bluffton, Ohio 45817.

TRIPLETTALL YOU'LL EVER NEED IN V -C -M's.

Triplett. The easy readers.. . . for more details circle 134 on Reader Service Card

Documents

NEW IN TV FOR '75 · SEPTEMBER 1974 75 CENTS ELECTRONIC TECHNICIAN/DEALER WORLD'S LARGEST TV -RADIO SERVICE & SALES CIRCJLATION NEW IN TV FOR '75 ... TEL 504. 885-2349 MARYLAND: 1105