IRC GUARANTEES SATISFACTORY MECHANICAL FIT AND ELECTRICAL OPERATION OR DOUBLE -YOUR -MONEY -BACK The typical manufacturer's specifications shown here are exactly duplicated b

TECH N C ANCircuit Digests

Hot WeatherTV Troubles

*4-

July 1954

Calclweil-Clcrnents, Inc

ONLY IRC GUARANTEES

SATISFACTORY MECHANICAL FIT

AND ELECTRICAL OPERATION

OR DOUBLE -YOUR -MONEY -BACK

The typical manufacturer's specificationsshown here are exactly duplicated byIRC QJ-180 control. CONCENTRIKITassembly includes P1-229 and R1-312shafts with B11-137 and B18 -132XBase Elements, and 76-2 Switch.

Wiimovvti(e,eocutt Salt -0A,

WHY IRC EXACT DUPLICATES

ARE DOUBLE -MONEY-BACK

GUARANTEED

The mechanical accuracy of IRC Exact DuplicateControls or universal CONCENTRIKIT equivalentsis based on set manufacturers' procurement prints.Specifications on those prints are closely followed.

Shaft lengths are never less than the set manufacturer'snominal length-never more than longer.

Shaft ends are precisely tooled for solid fit.

Inner shaft protrusion is accurately duplicatedfor perfect knob fit.

Alterations are never needed.

For Exact Duplicate Controls, specify IRC.Most Service Technicians do.

INTERNATIONAL RESISTANCE CO.425 N. Broad Street, Philadelphia 8, Pa.In Canada: International Resistance Co., Ltd., Toronto, Licensee

TECHNICIANe. Circuit Digests *

TELEVISION ELECTRONIC

M. CLEMENTS 0. H. CALDWELLPublisher Editorial Consultant

SOL HELLER, Managing Editor

SIDNEY C. SILVER, Associate Editor

J. L. STOUTENBURGH, Consulting Editor

ALBERT J. FORMAN, Consulting Editor

DR. A. F. MURRAY, Contributing Editor

ANN O'ROURKE, Assistant Editor

CHARLES F. DREYER, Art Director

ELMER KETTERER, Circuit -Digest Production

GEORGE PUGLICI, Circuit Diagrams

BUSINESS DEPARTMENT

M. H. NEWTON, Business ManagerH. A. REED, General Soles Manager

DIXON SCOTT, District ManagerLEE GRAVES, District Manager

CHARLES S. ROEVER, District Manager

N. McALLISTER, Asst. Business Manager

MARTHA USDIN, Production ManagerKATHLEEN CAFARO, Reader Service

WARREN S. BROWN, Circulation Manager

M. GROENING, Asst. Circulation Manager

JOHN J. BORGHI, ControllerW. W. SWIGERT, Credit Manager

480 Lexington Ave., New York 17, N. Y.Telephone PLaza 9-7880

S. M. GASKINS, Western .ManagerJOHN D. LUPTON, District Manager

201 N. Wells St., Chicago 6, III.Telephone RAndolph 6-9225

CHRIS DUNKLE & ASSOCIATESCa/ifornio Representative

3257 W. 6th Street, Los Angeles 5, Calif.Telephone DUnkirk 7-6149

1355 Market Street, Son FranciscoTelephone Klondike 2-2311, Ext. 579

CIRCULATION

This issue 50,000, which includes 45,114professional servicemen and service man-agers of retail stores, 2,006 parts distribu-tors, plus manufacturers and miscellaneous.

TECHNICIAN & CIRCUIT DIGESTS, Jaly 1954,Vol. 60, No. 1. $.50 a copy. Publishedmonthly by Caldwell -Clements, Inc.. Pobl NationOffice. Emmett St. Bristol, Conn. Editorial, Ad-vertising and Executive Oakes. 480 Lexington .Ave., New York 17, N. Y. Entered as secondclass matter at the Post Office at Bristol. Conn.one 10, 1954. M. Clements, President; M. H.

Newton, Assistant to President; John J. Bergh'.Vice President and Secretary; M. B. Clements,Treasurer. Subscription rates: United States andCanada, $4.00 for one year; $6.00 for twoyears; $8.00 for three years. Pan-American andforeign countries: $7.00 for one year; $10.00for two years; $14.00 for three years. PrintedIn U.S.A.

RADIO AUDIO SERVICE

JULY, 1954

TECHNICIAN'S COVER is intended to point up the importance of weather to the TV-rodioserviceman. This is the season to "sell" customers on lightning arrester installations. Areyou getting your share of the business? Other links between weather and TV reception aredescribed in Arcing Troubles in TV Sets.

"Stripped" TV Sets Spell Trouble 13

"Tuning in the Picture" 14

Improper Tinting Troubles in the Color TV ReceiverPeter Orne & Sol Heller 16

Making the Most of Your Test Equipment M. G. Goldberg 19

Arcing Troubles in TV Sets Mi-heel C a g 20

Shop Hints 23

Schematic of Late Model Hi-Fi Receiver 24

Mr. Boss Man: Are You Looking for More Help? 25

"Tough Dog" Corner 28

Color Shorts 30

New Items Bow at Parts Show 20

Servicemen Boosted on TV 33

Antennas & Related Products 34

Outlook for Technicians Albert J. Forman 36

Shop Equipment 40

Audio & Hi-Fi Products 48

Circuit Digests* 49

DEPARTMENTS

Letters to the Editors 6 Technician's Lighter Side 43Calendar of Coming Events 15 Service Ass'n. Reports 45New Products 32 Manufacturers' Catalogs & Bulletins 46

CALDWELL-CLEMENTS, INC.Publication °nice, Bristol. Conn.

Editorial/Business Offices 480 Lexington Ave., New York 17, N. Y., Tel. Plaza 9-7880Publishers also of MART and TELE-TECH Is ELECTRONIC INDUSTRIES

*Reg. U. S. Patent Office

Copyright byCaldwell -Clements, Inc., 1954

SUPER -PERFORMANCECOSTS NO MORE!

4)%

MAKE THE SCREEN TEST!

111 Measure the space betweenreflector elements of any othbig screen antenna.

IIINote, that the TRI-KING hascloser spacing between reflectorelements for improved per-formance. The TRI-KING'selement spacing is the provenmaximum for a full 1/10 wavelength. '

SUPERTRI-KING

ModelTK1800

WIND TUNNEL TESTED to exact-ing aircraft standards. Test resultsprove That a full size TRI-KING an-tenna tan withstand my -r- higher windvelocities than any other large screenantenna.

ORDER NOW - IMMEDIATE DELIVERY!

Model TRI-KING

TK1500

Super TK1800

List Price

$44.50$52.95

Model TK1500(Also available in single bay)

CLEAR BEAM'SPotent Applied For

POSITIVE GHOST REJECTION! Clear Beam proudly an-nounces the new TRI-KING, combining for the first timea Radar -type reflector screen with the improved TRI-KINGdipole assembly. A real champion with many Clear Beamfeatures including rugged, quality construction and Quik-Rig assembly that outsells all other big screen antennas.Sold on a money back guarantee.

WRITE FOR COMPLETE INFORMATION TODAY

Clear Beam Antenna Corp.Ca- A71°

100 PROSPECT AVENUE - BURBANK, CALIFORNIATHornwall 2-4886 Victoria 9-2141

WAREHOUSES IN: San Francisco Portland Seattle Chicago Kansas City Detroit

2 TECHNICIAN July, 1954

DELCO RADIO CAREFULLY CONTROLS THE PRODUCTION

OF ORIGINAL AND REPLACEMENT RF AND IF COILS

Each RP and It roil is ic(frami under the super-vision of a skilled operator, and each is tested atseveral points along the production line. Thispainstaking care is what gives a high I Q toDelco Radio Coils.

A GENERAL MOTORS PRODUCT A UNITED MOTORS LINE

INBUILT QUALITY. The "Q" of a coil affects its per-formance in the circuit, and is of vital importance to theradio engineer. The "I Q" of all RF and IF coils used forservicing is of equal importance to you, and can mean realcustomer satisfaction. To assure high I Q, Delco Radio care-fully controls the production of all RF and IF coils-bothoriginal equipment and replacement coils.

If you could visit the Delco Radio plant, you would seeskilled operators sitting at expensive specially designed ma-chines winding high -quality coils. On the production line,these coils are assembled with their powdered iron cores andshield cans. By controlling all steps of the production, DelcoRadio gives its coils not only the required Q, but also thehighest possible I Q-Inbuilt Quality. Delco Radio parts areavailable through your UMS Delco Electronics Distributor.

DISTRIBUTED BY ELECTRONICS WHOLESALERS EVERYWHERE

DELCO RADIODIVISION OF GENERAL MOTORS CORPORATION, KOKOMO,INDIANA

TECHNICIAN July, 1954 3

AfiE(AIMANCE

Introducing the longest line of replacement loud speakers with thelowest inventory requirement.

The highest performance in replacement loud speakers at thelowest cost.

THE NEW Viking Replacement Speakers by JENSEN.

Completely redesigned for all today's requirements, the new Vikingspeakers are completely streamlined both for stocking, selling andperformance. Viking is the most complete line for radio, TV, replace-ment and general purpose applications-there are 13 models includ-ing 3 ovalsBUT

because of the ingenuity of the Jensen design, you need only oneuniversally applicable model in each speaker size. Your inventoryrequirements are lower than for any other speaker line-your stockinvestment is cut to the bone.

And the Viking speakers are universal. The new Viking design isthe most compact, has the least depth of all the replacement speak-ers. They'll fit into even the most crowded sets. And with the mostcompacf design Viking has introduced greatly improved efficiency,heavier magnets, truly permanent alignment, at no increase in pricein all models 6" and smaller.

Free with all sizes from 3" to 6" Viking speakers new free, easy -mount combination transformer and chassis mount bracket.

4 MANUFACTURING COMPANYemen

Division of The Muter Company6601 South Laramie Avenue Chicago 38, IllinoisIn Canada: COPPER WIRE PRODUCTS, LTD, Licensee

Exclusive! Electro-Lens Focusing*

New WinegardINTERCEPTORGrabs and Boosts the Signal...Focuses It...like a Lens Completely new in appearance. Completely new in electricaldesign. Sensational in results! The new INTERCEPTOR antennanow combines the famous Winegard Multi -Resonant Dipole withthe most sensational electronic design of the decade .. .

Electro-Lens Focusing.' This exclusive Winegard featureliterally grabs the signal out of the air and focuses it onthe driven element the same as an ordinary lens focuses light.The result ... a picture gloriously brilliant ... sharp andclear. A picture up until now umobtainable!

Never before has one antenna incorporated so many outstandingand exclusiive features. The INTERCEPTOR gives highest possiblegain and still maintains rejection from the back and sidesthat really shuts out co -channel) interference. Its Electro-LensFocusing makes it an ideal fringe area antenna withoutthe bulk required by present fringe antennas. Small, light-weight and compact, the INTERCEPTOR'S neat appearance willbe apprec ated by owners of the finest homes.

Attention: Servicemen! You will notice we show no charts trying toestablish fabulous claims. We suggest you order a WinegardINTERCEPTOR today. If your regular jobber does not have it, please contactus. Test it for yourself. The INTERCEPTOR is its own best salesman!

A Winegard Exclusive ... Electro-Lens Focusing. All channels ,2-13). Light, rigid, quick to assemble, easy to install. Low wind resistance. Designed for color reception.

3000 Scotten Boulevard, Burlington, Iowa

For complete information on the WinegardINTERCEPTOR VHF antenna with exclusiveElectro-Lens Focusing, send for Bulletin No. L-4.

*Patent Pending

TECHNICIAN July 1954 5

3fipidLeeie

CRYSTAL PICKUP CARTRIDGES

cartridges you are most likely to encounterin your service work!

MODEL RK-54Replacement KitList Price $22.55

TECHNICAL DATA AND REPLACEMENT CHART IS ENCLOSED.Lists 192 Crystal Cartridges manufactured byfive leading cartridge manufacturers.

Lowest investment for broadest coverage! The RK-54 is beyondall doubt the most practical Replacement Kit on the market! Proof? Simply this-you get the broadest coverage at the lowest investment-only $22.55 list!Think of it -3 Crystal Cartridges replace 192 of those specific Cartridges mostlikely to be in need of replacement! Two of the Cartridges consistently havebeen "best sellers" in the Shure line-as established by actual sales to Servicemen!The Cartridges are: Model W22AB, 3 -Speed, 2 -Needle Cartridge-Model W26B,All -Purpose, Single -Needle Cartridge-Model W78, 78 RPM, Dual -Volt, Dual-

Weight Cartridge. Model W78 is the new, versatile Cartridge that replaces 149other Cartridges! This Cartridge alone will become a sensation overnight! Ordera Replacement Kit from your Distributor today --once you have worked withthis practical kit you will find that these three Cartridges are dependable re-placements-will make your service work faster, easier and more profitable!

TRANSPARENT PLASTIC BOX IS FREE!This Handy Box is 5" long, 3;1Z wide,

y., deep.

31 4teik ait y

LETTERSTo the Editors

Complimentary DilemmaEDITORS, TECHNICIAN:

Please send 2 giant blow-ups of "SoMuch for So Little." The reason I didnot use the coupon is that, on the otherside, is the "Tough Dog Corner." Icould not afford to lose that valuableinformation. . . . Of all the radio -TVmagazines I've read, TECHNICIAN isthe best.

LEE N. DIXONChicago 12, Illinois

Filing Circuit DigestsEDITORS, TECHNICIAN:

I would like to see you put out en-velopes similar to the ones Sylvaniaputs out to fill 3 -hole binders. I madeone envelope for my first Circuit Di-gests, but it would look neater to haveone made for the purpose.

R. F. JOHNSONSpringfield, Illinois

Let the Public KnowEDITORS, TECHNICIAN:

We wish to compliment you on bring-ing before the public (the fact that)the services rendered by the televisionradio technician are one of the greatestbargains received by the public today.We hope that you will continue in thisgood work and thereby give both thepublic and serviceman more confidencein each other.

PAUL F. STEVENSMiami, Florida

Friend in NeedEDITORS, TECHNICIAN:

Any service outfit that doesn't haveTECHNICIAN must be nuts. . . . Whensomebody has a kick coming or feelsthey haven't got a square deal, all youhave to do is refer them to some partin TECHNICIAN; that fixes it up. Ialways have (it) handy.

F. BECKMANOakland, California

Hit, No ErrorEDITORS, TECHNICIAN

Regarding the June 1954 issue ofTECHNICIAN, the cover states, "Don'tFumble the Ball." How could that bepossible? It looks like a home run.

F. J. CONTINOPhiladelphia, Penna.

The advice was not directed to theplayers, but rather to our spectator -readers, toward whom the sphere ap-pears to be coming fast and hard. Sorryif this "face-saving" admonition gotanyone balled up.-Ed.


GET OFF THE SPOTI

BONDED ELECTRuNICTECHNICIAN PROGRAM

Once you gain the confidence of customers, you're on your way to increased volume andprofits. The Raytheon Bonded Electronic Technician program is designed to help you dojust that. The Raytheon Registered Bond Certificate, the Raytheon Creed Display Decal andIdentification Cards, featuring your bonded status and the fine Raytheon "Code of Ethics",inspire customer confidence. And a recent survey proved that wherever Raytheon Bonded

RtR Technicians took full advantage of their Bonded status - used it to in-i

4" spire customer confidence - business improved by at least ten per cent.

Ask your Raytheon Tube Distributor if you can qualify for this im-portant sales advantage. If you can, the bond is yours at no cost to you -it is Raytheon's investment in your future.

RAYTHEON MAN.eiving Tube Division

ewton, ass., 'cage, Ill., Atlanta, Ga., Loi Angeies, al.

KUM AM PICTUE TOES MULE SIIMINIATIME ANN MINIATURE TOES SENICOIMICTOR IIIIES ANN TIUMSTIU NICLEINIC TIMES MICROWAVE TINES

G COMPANYciYTHEON

emeelleftee its ofieestikamiee


A look inside will show you why

CROSLEY SUPER-V IS ASERVICE MAN'S DREAM

Everything about this exciting newTV set was planned and built with youin mind! Crosley's own revolutionaryvertical circuit makes checkups simplerthan ever. Changing a tube takes onlya few minutes (they're all at the back

Bonnet -type cabinetlifts right off

No more chassis tugging

Every tube accessiblea t rear

in easy reach) and more complicatedservice requires only the loosening of6 screws; lifting the entire cabinet off.Men who've serviced the Super -Vcall it the greatest forward step in TVchassis design.

Divisionr

Pointswired onterminalstrips-easiercircuit tracing

AL CO Cincinnati25, Ohio

TECHNICIAN July, 1954

C ALIGNMENT SCREWDRIVER).100 1/4" dia. 6" long $0.27 Net188 7/32" dia. 6" long .27 Net

C TV -FM ALIGNMENT TOOLo. 5066 3/16" shaft dia.,

21/2" long $0.33 Net

-C TV ALIGNING WRENCHo. 508e 7/32" shaft dia.,

6" long $0.51 Net

-C K -IRAN TOOLlo. 5097 5/32" fibre tip, Ve" metal

tip, 6" long $0.51 Net

-C TV CHANNEL TUNING TOOLo. 8195 1/8" shaft dia., 71/4" long $0.54 Net

G -C NYLON TV LONG -REACH ALIGNERNo. 8607 .195" shaft dia.,

121/4" long $1.08 Net

0

IE SUREYOU

USE

*thelea

-coy owl

giolitotNOW

MORE'THAN

70

MAGtiottik

t4C:OIS

LABLEfOR

SERVICING'[V

matter what kind of set you're working on, there's a specially made G -C

kignment Tool to do the job. It's all part of G -C's continuing program todesign and manufacture new service aids for you as soon as a new TV chassis

is announced. Remember - you save time, labor, avoid damage to the chassis

. . . when you use the right alignment tool for every alignment. And of course

the right one is always . . . a G -C Alignment Tool!

WOO G C ALIGNMENT

TOOL KITS

for Handy Home Servicing

You save moneywhen you

buy a GZ AlignmentTool

Kit ... and thetools are always

handy whenyou need

them.Many types

and sizes. . .

like this new set

GZDELUXE. PI

ALIGNMENITOOL

Durableroll

type leatherettecase

with 16 matchedtools (total

No. 8280

$7.14 Net

value $15.001.

C=1:3=1:3G -C LONG ARM TV TOOL(7/32" shaft dia., 18" long)No.8821 Type A8896 Type B8897 Type C

8821Type A

8897Type C

$0.90 Net.90 Net.90 Net

G -C TV "X 57 PLASTIC LONG SLIM"SCREWDRIVERNo.898789888989

Blade Length7r,

12"16"

$0. Net.9060 Net

1.20 Net

G -C TV I.F OSCILLATOR ALIGNERNo. 8272 V4" Up dla., 61/2" long $0.72 Net

IT'S FREE! Your illustrated GC Catalog 156.At your favorite jobber ... or write direct.

G -C TV ALL-PURPOSE ALIGNERNo. 8273 7132" shaft dla., 8" long $0.66 Net

G -C TV CORE ALIGNERNo.11279 7/32" shaft dia.,

Ph" long $0.66 Net

GENERAL CEMENT MFG. CO.902 TAYLOR AVENUE ROCKFORD, ILLINOIS

G -C TV ZENITH UNIVERSAL ALIGNERNo. 8275 Va" shaft dia., 1/4" handle,

5" long$0.48 Net

G -C RCA -ZENITH TV "SHORTY"ALIGNMENT TOOLNo. 9051 7/32" shaft dia.,

21/2" long$0.45 Net

G -C RCA -ZENITH TV ALIGNMENT TOOLNo. 9050 182" shaft dia., 3" 'org

$0.18 Net

G -C TV LONG REACH ALIGNERNo. 8274 1/s" shaft dia., 9" long

$0 72 Net

when you use Mallory Midgetrols

because the round, tubular shaft ofthe Mallory Midgetrol can be cutaccurately and quickly. Easilyadapted to split -knurl, flatted, orset screw type knobs. And yousave additional time because ACswitches can be attached instantlywithout control disassembly.

because Mallory Midgetrols areengineered to match the electricalcharacteristics of original equip-ment of any radio or TV set . . .give equal, often better, perform-ance than the original control.

always use MalloryMidgetrols. You'll save

time and trouble. And, equallyimportant, you can depend onMallory Midgetrols for perform-ance that makes satisfied customers.

To make your auto radio repair work easier ...The new Mallory Auto Radio Control Guide speedsselection of the proper control for every job thatcomes your way. Ask your Mallory Distribu-tor for a copy . . . or write to P. 0. Box1558, Indianapolis, Ind.

CAPACITORS CONTROLS VIBRATORS SWITCHES RESISTORSRECTIFIERS POWER SUPPLIES CONVERTERS MERCURY BATTERIES

APPROVED PRECISION PRODUCTS

Performance! Profits! Packages!GET THE BEST IN ALL 3 WITH THE NEW

GERMANIUM

Federal DIODESHighest quality diodes for every

replacement need...packed for economybu ying . in the service industry's

MOST USEFUL PACKAGE LINE!Servicemen! Federal's "S -C -S" Germanium DiodePackaging Program is the hottest news in diode pur-chasing!

You get top performance and attractive profits inhandy packages you can use for many practical pur-poses.

You can buy single units in cellophane-wrappedpackages . . . you can buy 5 -unit and 10 -unit pack-ages in the form of clear plastic cases with hingesand snap -lock. You can buy boxes of 50 single-unitpackages ... at a substantial saving!

Look for "S -C -S" Diodesin Federal'sStore Dispensers!When you're shopping at yourFederal Distributor - look forthese two types of dispensers: (A)counter dispenser with single-,five- and ten -unit packages; (B)wall dispenser with single -unitpackages. Serve yourself ... savetime! Watch for them in stores. . . in golden yellow and bril-liant red!

Nerd

CHECK the quality and perform-ance features of Federal's new de-sign achievement in diodes! You'llagree that Federal is your best betfor profitable, customer -satisfyingdiode servicing!

FederalTelephone and Radio Company

A Division ofINTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION

COMPONENTS DIVISION, 100 KINGSLAND ROAD, CLIFTON, N. 1.

In Canada:Federal Electric Manufacturing Company, Ltd., Montreal, P.Q.

Export Distributors:International Standard Electric Corp., 67 Broad St., N. Y.

10 -UNITPACKAGE-economy -sizeclear plastichinged utilitycase.

Ca)- ..-.--Federal

tINIUMAIGIUM DOOM

tmat.ttttt0.11.1111.11/0.

SINGLE -UNITPACKAGE-cellophane -wrapped.

Federal "S -C -S" DiodesARE TOPS!

SINGLE -CRYSTAL GERMANIUM-the finest forreliable performance

MOISTURE-PROOF-vacuum-sealed, all -ceramic construction

EVERY DIODE TESTED for all characteristicsCOMPLETELY INSULATED CASEPOLARITY clearly IdentifiedHEAT SINKS protect during solderingSMALL SIZE (-1/2' diameter, 1/2" long)FLUME LEADS for easy mountingNO FILAMMIT-no heater power drain or humLOW SHUNT CAPACITY (average I nunf.)SILF-HEALIMS for temporary overloadsNO CONTACT POTENTIALWITHSTAND adverse temperature and humid-

ity cyclingINSURE many thousands of hours of depend-

ablevends of

PACKAGE-clear plastichinged utilitycase.

50 -UNITPACKAGE-large -economy -size, combinationdispenser -container ... a realmoney -saver!

PACKAGESYOU CAN USE!Be sure to save Federal's 5 -unit and 10 -unit packagesof clear plastic. They'rehinged . . . they snap -lock

. they open easily. Excel-lent for storing small parts... carrying in pocket orkit or filing in shop cabi-nets. They're a plus valueyou get with Federal quali-ty -controlled "S -C -S"Diodes!

Ask yourFederal

Distributoror write to

DEPT. R-354


The 13 A C SSTOPS co -channel and adjacent-channel interference caused byrear signal pick-up!

Highest front -to -bock ratio ever built into an antenna! No rear pick-up; eliminates "venetian blinds"! Largest screen area: 70 square feet! Very high all -channel gain. Incorporates basic

Champion design, including Tri-Pole, with additionalelements!

Completely preassembled!

Table ofFiant-to-Bock Ratios

Relative Vobogy)

ChannelsFront -to -Bask

Ratios

2 9:1

3 10:1

4 11:1

5 20:1

6 18:1

Only Low Bond channelshown, since co -channelinterference is not encounfeted on High Bandchannels.

0

300

270

240

3 Gala Above Toned Referersee DipoleI

Chancel

1mmE E

IMPORTANT . . . don't be misled by polarpotterrs representing relative POWER. Remem-ber, power is the square of voltage. AllChannel Master polo, patterns are presentedin relative VOLTAGE.

The most beautiful antennaever made! The onlyindoor antenna featuring powerfuloutdoor design principles -Bow -Tie and Screen.

DESIGNED FOR POWER!On UHF: For primary and secondary areas. In many

cases, performance is equall to actual outdoor installa-tions. Good directivity on cll channels.

On VHF: Ideal in areas of strong VHF signals.

STYLED FOR BEAUTY !Designed by a well-known industrial designer, the

WONDER BOW is proof that indoor antennas can bebeautiful as well as powerful. Wins customer approvalon beauty alone!

Coln Above Tuned Reference Dipole

The first gainfigures ever tobe publishedfor an indoorantenna!

Gold and blackmodel no. 4116

Silver and blackmode/ no. 417

CHANNEL MASTER CORP F f t r l l,$8" list

Write for complete technical literature.

The World's largest Manufacturer of TV Antennas Copyright 1954, Channel Master Corp

model no. 326-2

VHF -UHF antenna

$6390list

VHF -UHF

indoor

antenna

'Pat. No. D-171560

TECHNICIAN& Circuit Digests

CALDWELL-CLEMENTS, INC., 480 LEXINGTON AVENUE, NEW YORK 17, N. Y.

"Stripped" TV Sets Spell TroubleIs quality being sacrificed in many current TV sets to make "low, low

prices" possible?Evidence says it is. The situation is disturbing to many technicians."Low -low" priced receivers mean that service charges on these sets have to be scaled

down; at the same time, the amount of service work that will be needed will, in allprobability, go up, since design corners have been cut in many of these sets, and morefrequent development of trouble is very likely.

In some of the fine TV sets made in '47, you could cut out 4 or more bypass con-densers, without appreciably affecting reception. These sets were generously "over -designed," to delay the onset of trouble, and minimize it when it occurred. Comparablesafety factors are not being built into numbers of low-cost receivers currently reachingthe market.

Poor Quality Means More Service Headaches, Less ProfitWhat has forced quality down so low in many current sets? The obvious answer is,

of course, the manufacturer's desire to reduce costs, in order to meet competitive prices.Pushed beyond reasonable limits, such a course initiates a vicious circle. Quality is

reduced to cut prices below those set by the competitor; the competitor, in turn,reduces his prices, inevitably impairing quality control on his sets; and so it goes,round and round. Any temporary advantage obtained from a price reduction is soonnullified, and the competitors find themselves at the end in basically the same position,but with profit margins reduced, and receiver quality seriously impaired.

The technician suffers from the situation, in that he is forced to do in the shop, whatshould have been done in the factory: i.e., finish the set, ironing out performance"bugs." He can hardly turn such jobs down; the risk of losing all of the customer'sbusiness is too great. On the other hand, his recompense is too small to warrant thetime, skill and heartache such repairs call for.

Looked at from all sides, the policy of cutting quality to the bone to reduce costs,is not a good one. The customer will certainly be dissatisfied with his set's performanceand his service bills; the benefits to the manufacturer, if present at all, will be highlytemporary, and associated with many disadvantages. The technician, of course, willreap disadvantages without deriving even temporary advantages.

In behalf of the technician, our advice to the set manufacturer is: Put out sets thatdon't fall below minimum standards of quality-sets that will stand up in use forreasonable periods of time, and can be profitably serviced.

Finish your sets at the factory-the serviceman is too busy to do it for you.

0 0 0 01947 10 -inch TV Set $375

$5.95 per square inch

TV Receiver Prices

Based on Screen Size

DOWN 87.5%in Seven Years

1954 21 -inch TV Set $180$.74 per square inch


tiumitig In the"HEART -OF -HEARING" MEDICOS should have

their problems solved by Altec-Lansing's new medicalmike. Incorporating the model M-16 Lipstik Hi-Fimicrophone, the new unit accommodates a standardstethoscope head, may be sterilized without damage inheated air. Heart sounds may be picked up accurately,amplified and recorded. Now in use at Johns Hopkinsand other hospitals for examinations and educationalpurposes, the system may open up a new era in cardi-ology. It is now possible for the patient to be examinedin his own home through his own Hi-Fi unit. . . .

HOW'S BUSINESS DEPARTMENT: Set saleshave been slow, but some dealers are ahead of lastyear, and profits are down at all levels of industrybecause of widespread price -cutting and the "special-ization" iv selling low -end models . . . Service vol-ume is holding up fairly well in most areas, thoughcollections are slow, and credit to dealers by sup-pliers is tight . . . Technicians are working on plentyof brand-new sets these days, in cases where con-sumers bought units "as is," or from outfits withpoor service facilities. (One Eastern shop charged$26 for repairing a set the customer had owned onlytwo days, installing a couple of resistors, a coil, threetubes, and doing other work in the shop.) . . . Volumeof repair work on portables has been fair thusbut should pick up from now until vacation seasonis over . . . With costs up sharply in service depart-ments, owners are experiencing difficulty in tryingto service profitably old midgets, many pre-war,which sold at low prices.

EUROPEAN TV: BRITISH BUS AND SUBWAYFARES may rise because TV is growing. Fare increasewould make up loss of revenue due to tail -off in ridersduring evening hours. The claim is that TV is keepingLondoners in their homes at night. . . . FRANCE: Thenational radio tax has been upped about half-a -bucka year to finance the building of nearly 40 TV stationsin the next few years. . . . U.S.S.R.: The 8 -in. Lenin-grad T-2, covered in February TECHNICIAN, has beensuperseded by a later model, using a tube equivalentto our 14 -in. size, made to sell for more than $550.

TELEVISION RECEIVER PRODUCTION

[=11,1

7,500,000 5,600,000 6,300,000 7,300,000 3,900,000

- 1950 --- 1951 - 1952 - 1953 Jul' 1954

RADIO RECEIVER PRODUCTION

14,600,000 13,000,000 10,00,000 13,400,000 5,500,000

"You're a fine character actor, Basil-but thenetwork's been getting too many complaints frompeople who think their picture's distorted . . ."

SENATE SUBCOMMITTEE set up to investigateUHF got a letter from H. Fogel, prexy of GrancoProducts, stating that UHF stations face unfair com-petitive practices. Nearby VHF transmitters are per-mitted to monopolize best programs, said Fogel, with"left-overs" going to UHF. Public is then reluctantto invest in converters, antennas and other specialequipment needed. Also, says the writer, allocationof a VHF channel in a service area shortly after aUHF station has gone into operation doesn't give thelatter a chance to get on its feet. Another factor:Increase in transmitting power by strong, establishedVHF set-ups lets them spill over into new UHFareas, killing off their young UHF competitors beforethe latter can get going.

TV RECEIVER SALES for first 2 months of '54 upnearly 8 percent over the same period last year . . .

Guesstimaters say that 90 percent of American homeswill be TV -equipped in little more than 3 years fromnow. . . . Because of increased demand, the U. S. Infor-mation Agency is doubling its overseas TV broadcasts.Our video fare is gaining considerable popularity inLatin America.

IN ADDITION TO HANDLING the most efficientantennas possible, technicians should also make cer-tain that the materials used are of top quality so thatthe outdoor jobs will stand up well under the severeweather conditions often encountered. Many anten-nas, masts and related equipment of inferior work-manship and material have cost shop owners cus-tomer good -will and unnecessary expense in replac-ing or repairing defective stuff.

AS A RESULT OF SOLICITING non -servicing deal-ers, the owner of a small shop in a Midwestern city isdoing 80 percent of his volume in dealer work, with thebalance being devoted to consumers' repairs. Two yearsago he didn't have a single contract job.


Pialtre IIHI-FI SALES MESS, promoted by direct sales to con-

sumers by jobbers and wholesale houses, rather than bynormal retail outlets, may get cleared up if the popu-larity of Hi-Fi equipment for home use continues to rise.Some far-sighted manufacturers are willing to revisethe distribution set-up, for the good of the industry, ifsales go up enough. Until recently, they say, not enoughhome -system equipment was marketed to worry aboutmass selling. Some manufacturers are even planningcourses in Hi-Fi servicing for dealers and dealers'technicians.

TV MEMORY MIRROR: Remember the earlyhigh -voltage power supplies, in the days before theflyback system became just about universal? Onesystem used "brute -force" high voltage, developedfrom the ac line input through a step-up powertransformer with a high turns ratio. Electrical hazardon these units was shocking. Then there was the r -foscillator and associated hv supply, common to manyac -dc or projection -type receivers . . . How aboutthe picture -shape problems the round -screen tubesbrought with them? At first, a rectangular picture,which wasted nearly half the usable area on thescreen, was the vogue. Then the "pumpkin -face"shape used more of the screen, but cut off the cor-ners of the image. Some makers went as far as usingall of the screen ("giant circle"), sacrificing nearlyhalf the picture and stretching the raster vertically.Guess we'll never see so many tall, thin tables again.

BIG STORE, IN NORFOLK, VA., operated by H. B.Price, Jr., employing as many as 25 servicers, pays tech-nicians commissions on leads, and finds this practicepays in developing new business.

RECORD-PLAYER SALES ARE UP thanks toprice reductions; tape recorder sales are up, too.Several sources are toying with the idea of producinginexpensive tape machines that may be plugged intothe radio, TV set or Hi-Fi system, just as recordplayers are. Non -recording playback -only units, com-parable to the present non -recording player -onlyphonograph assemblies, look like a strong possi-bility.

DID YOU KNOW THAT the antenna business isthe most highly competitive end of the componentindustry? . . . That antenna sales, together with hard-ware, rotors, masts and accessories are running at anannual rate of about $115,000,000? . . . That thereare still fringe areas where installation costs runhigher than price of the new TV set?

PUBLIC INTEREST IN COLOR -TV is now at a newlow, but the new art is probably closer to the technicianthan he realizes. Tremendous amount of lab work ontubes is bound to result in something startling andsatisfactory before long. Just as soon as numbers oflarge -screen sets hit the market (possibly early nextyear) programming will be stepped up, and servicersin most communities will be working on the receiversthat "pioneer" consumers will buy even at high prices.

EUROPEAN TV NETWORK went into operationlast month linking Belgium, Denmark, England,France, Germany, Italy, the Netherlands and Switz-erland. Appropriately enough, an international soc-cer match on June 6 was the "kick-off" program.

ODD -BUT -TRUE DEPARTMENT: Chicago TV tech-nician is also a top-notch servicer on outboard motors,sold by his firm.... Service manager of a large TV con-tracting firm in an Eastern city is a woman. . . . N. Y.cop gave a speeding ticket to a technician; found outthat the servicer was bound for the police officer's hometo repair the latter's set. . . . Technician in Milwaukeecalled at a home to repair what customer described asa "clock -radio," only to find that the unit was a radio ina grandfather's clock case.

MORE AND MORE TECHNICIANS WILL beservicing tape recorders from here on. The big phonorecord makers are joining others in producing andexperimenting with pre-recorded tape, an activitywhich is bound to create increased interest in theseinstruments. On the way, too, will be some "replace-ment" heads to convert standard recorders into "Hi -Fr units.

CALENDAR OF COMING EVENTS

July 12-15: National Association of Music Merchants Trade Show,Palmer House, Chicago, III.

July 24: Parts Distributors' Seminar, Sponsored by National Elec-tronic Distributors Assoc. and Radio Parts & Electronic Equip-ment Shows, Washington Athletic Club, Seattle, Washington.

Aug. 25-27: Western Electronic Show & Convention, Pan -PacificAuditorium, Los Angeles (show) Ambassador Hotel, Los An-geles (convention hq.)

Aug. 27-29: TV Service Clinic, Sponsored by the Texas ElectronicsAssociation, Adolphus Hotel, Dallas, Texas

Sept. 24-26: Fifth Annual TV -Radio Service Industry Convention andExhibitions, Morrison Hotel, Chicago, Ill.

Sept. 30 -Oct. 2: High Fidelity Show, Washington Athletic Club, In-ternational Sight and Sound Exposition, Palmer House, Chicago,

Oct. 4-6: Tenth Annual National Electronics Conference, Hotel Sher-man, Chicago, Ill.

Oct. 8-20: Radio -Electronics -Television Mfrs. Assoc. Radio Fall Meet-ing, Hotel Syracuse, Syracuse, N.Y.

Oct. 13-16: The Audio Fair, Sponsored by Audio Engineering Society,Hotel New Yorker, New York.


aM

Improper Tinting TroublesBy PETER ORNE

andSot HELLER

MANAGING EnrroR, TECHNICIAN

If a color transmission is receivedin the wrong colors, an attemptshould be made to correct the condi-tion by adjusting the hue control,before going on to other procedures.The hue control, the reader will re-member, regulates the phase of thelocal 3.58 mc oscillator with respectto the incoming burst signal. Sincehue information is reported on bythe phase of the subcarrier, puttingthe local 3.58 mc oscillator (whichfunctions as the subcarrier) into thecorrect phase, will provide theproper hue in the picture (assumingno other trouble is present).

If adjustment of the hue controlcannot provide the proper coloring,trouble in one of the color stages of

Locating the Defective Section When

the receiver is indicated. The fol-lowing possibilities must be consid-ered in this case: 1-The hue con-trol is not able to reach the properphase. 2-The quadrature adjust-ment between the I and Q channelsis not correct. 3-A defect in the Ior Q channel is present.

Let's discuss first, adjustmentsthat are made on the receiver toprovide correct coloring. (It is as-sumed that color synchronization ispresent-i.e., that color informationis visible and stationary. Adjustmentof the color apc system to providesuch a stationary pix, when one isn'tpresent, will be described in a laterarticle.)

Now, in the receiver under discus-sion, the I channel obtains its 3.58mc reference signal directly from

the oscillator. In order to obtain de-tection along the I axis, it is neces-sary to adjust the phase of the oscil-lator with respect to the incomingburst signal. Since by transmissionstandards, the burst and the +I sig-nal are at a phase angle of 57 de-grees, we can, by getting the burstsignal correctly -phased with respectto the receiver's local oscillator, as-sure correct phasing between theoscillator and the I signal. The situ-ation may be clarified by consider-ing the 3 signals as wheels. If theoscillator wheel meshes with theburst wheel, it will also mesh withthe I wheel, since the burst and Iwheels mesh.

So then-it is necessary to adjustthe phase of the oscillator with re-spect to the incoming burst. This can

Fig. 1-Block diagram of chrominance stages in the color receiver, showing adjustment and check points.

FROM BURSTSEPARATOR

BURST

AUTOMATICPHASE CONTROL

(PHASE DETECTOR)

REFERENCESIGNAL

HUE CONTROL

ADJUST FOR"r PHASE

COLOR PHASEAMP.

t- BUFFERTRANSFORMER

3.58 MCOSC.

FROMFIRST VIDEO

AMP CATHODE

BAND-PASSAMPLIFIER

OUADRATUREAMP.

"I" DEMODULATORAND FILTER

ADJUST FOR''(:)" PHASE

"0" PHASESPLITTER

CHECK POINT"0" PHASE

0' DEMODULATORAND FILTER

QUADRATUREOUTPUT XFORMER

CHECK POINTFOR "rPHASE

"1' GAINCONTROL

FlieCHROMACONTROL

"I" AMPLIFIERAND PHASEINVERTER

FROM DELAYLINE

GANGED CONTRAST CONTROLS\--

"Y" AMP.

MATRIX

RED ADDERAND AMP.

[

GREEN ADDERF.,AND AMP.

HBLUE ADDERAND AMP.

CHECK POINTFOR CHROMAAND "1"GAINADJUSTMENT


in the Color TV ReceiverIncorrect Hue is Visible in the Picture

be done, to some extent, by manipu-lating the hue control. When theproper oscillator phase cannot be ob-tained by hue control adjustment,another procedure becomes neces-sary. The serviceman can tellwhether the adjustment just de-scribed has been successful by not-ing whether flesh colors in the pic-ture seem correct, or by checking thecolors delivered by a bar patterngenerator.

When the proper oscillator phasecannot be obtained by manipulatingthe hue control, the transformer inthe color phasing amplifier (refer toFig. 1) should be adjusted, and re-sults noted. That is, the secondarywinding of this transformer shouldbe re -tuned. The transformer feedsthe oscillator reference signal to thephase detector. The adjustment issimilar to the phase adjustment onthe secondary of the oscillator in theRCA 630 Synchrolock system. It isbest made when a bar pattern (Fig.2) is being transmitted. Details ofthe procedure are as follows:

"I" Demodulator Output

A scope is attached to the filteredoutput of the I demodulator. Thesignal seen on the scope at this point-with the bar pattern signal comingin-will have the appearance (seeFig. 2A) of a stationary automobilecrankshaft. (When the color syncsignal is absent, and the frequencyof the receiver's local oscillator isclose to the correct value, the barillustrated in Fig. 2A appears to ro-tate, hence its name, crankshaft.)

Now, the bar pattern currently be-ing used as a standard contains, inits top half section, colors in theorder shown in Fig. 2. The bottomhalf section consists of reference barssuitable for alignment. In this bot-tom section there is a dark cyan bar(-I); a bluish -purple bar (B -Y);a magenta bar (Q) ; and one blackand one white bar. With the scopeconnected at the output of the Idemodulator, no output for the Qsignal should be visible; i.e., the dot-ted line in Fig. 2A, representing thescope output for the different barsat the bottom of the bar pattern,should be at the zero level while theQ bar is being scanned. If it isn't,

the hue control-and the secondaryof the buffer transformer, if neces-sary-is adjusted until the Q baroutput is zero. The white bar in thebar pattern is present for referencepurposes; since there is no colorsignal output from the demodulatorsduring the transmission of white,this bar establishes the zero refer-ence level.

If an adjustment of the buffertransformer is found necessary, itshould be kept in mind that thetransformer should remain tuned as

closely as possible to resonance.When any resonant circuit is de -tuned slightly, the phase of its signaloutput is shifted; when the resonantcircuit is considerably detuned,however, its gain is appreciably low-ered. Limiting the buffer trans-former adjustment to the pointwhere appreciable detuning does notoccur, insures that the reference sig-nal going to the phase detectors willbe large enough in amplitude to pro-vide proper operation of the apcsystem.

When the I phasing adjustmenthas been correctly made, a Q phas-ing adjustment may be found neces-sary. This adjustment is intended to

Fig. 2-(Top) Bar pattern sent out by color TV stations. (Bottom) Scope waveshapes producedby bar pattern. In (A), the / channel output for the top half of the bar pattern is shown insolid lines; the I output for the bottom half of the pattern is shown in dotted lines. This bot-tom waveform is shown separately in (B). The Q channel output for the entire pattern is shownin (C). Dotted line shows output for bottom half of pattern. (DI shows separately the clotted -

line waveform of (C). In (E), I channel output with misadjusted phase condition is illustrated.

GREEN YELLOW RED MAC. BLUE CYAN GREEN

(DARK

CYAN)

B -I(BLUISH

PURPLE)

(DARKMAGI

BLACK WHITE

r - -s

r

0 BAR OUTPUT MUST

BE ZERO IN -I CHANNEL

--T0

-I BAR OUTPUTMUST BE ZERO

IN N CHANNEL

C-

-J

0 BAR (INCORRECT)SHOWS SOME POSITIVE

OUTPUT

0

0

NAG.. MAGENTA

HEAVY ARROWS

INDICATE IMPORTANT

AREAS TO WATCH

DURING PHASE

ADJUSTMENTS

0.ZERO LEVEL


Y AMP.

MATRIX

-1 ,vv+Slf\AAr_.

+0

+0

Q

PHASE-SPLITTER+I

+I

PHASE- SPLITTER

BLUEADDER

BLUE GAINCONTROL

4

BLUEAMP.

FEEDBACK

REDADDER

FEEDBACK4

GREENGAIN

CONTROL

GREENADDER

REDAMP

BLUE DCRESTORER

BLUE GUNI I

1 1 II

L

FEEDBACK4

GREENAMP

RED DCRESTORER

RED GUN

11 I

1 1

GREENGUN

GREEN BACK-GROUND CONTROL

BLUE BACK-GROUND CONTROL

GREEN DCRESTORER

- MASTERBACKGROUNDCONTROL

BLUE SCREENCONTROL

RED SCREENCONTROL

GREEN SCREENCONTROL

Fig. 3-Block diagram of matrix -adder section of color receiver. The matrixes are purely resistive networks in grid circuits of the adder stages.

make the phase of the 3.58 mc oscil-the Q demodula-

tor correct, assuring that the neededquadrature relationship between theQ and I signals will be present. Atransformer in the output circuit ofthe quadrature amplifier (refer toFig. 1) provides such an adjustment.In this case, the scope is connectedto the output of the Q demodulator,and the secondary of the quadratureoutput transformer is adjusted untilthe output produced by the scanningof the I bar is zero (refer to Fig. 2C).

If the procedures described can-not be successfully performed, trou-ble in the section that can't be ad-justed is indicated. If either demodu-lator, for instance, has no output, adefective tube may be responsible,or some other circuit trouble maybe present.

Keep in mind that proper opera-tion of the demodulators requiresthat the color sidebands of the trans-mitted signal, and the 3.58 mc oscil-lator signal, be applied to the appro-priate grids of these tubes (colorvideo signals are fed to the controlgrid, while the 3.58 mc oscillatorsignal is fed to the suppressor grid,in each demodulator). A scope witha sufficiently high frequency re-sponse (extending to 4 mc) may beused to check for the presence ofthese signals in the demodulator sec-tion of the receiver.

Suppose that the adjustments wedescribed previously have beenmade; the output at the demodula-tors is normal (the Q channel de-modulator should put out a signalwith an amplitude of about 20 vpeak -to -peak, while the I channeldemodulator, due to its wider fre-quency response, may be expectedto deliver a p.p. signal only 3 v inamplitude) ; the picture, however, isstill not correct in its coloring. Thedefective circuit may, in this case,be found either by a scope check atthe output of each of the phase split-ters, or by careful analysis of thecolor bars (on the crt screen). Scopechecks are made at the output of thephase splitters because these are thepoints where individual +I, -I,+Q and -Q signals may be exam-ined with a minimum of disturb-ance to the circuits.

Bar Pattern Analysis

With respect to analyzing the barpattern-let's consider an example.Suppose that the greens in the barpattern are not as bright as theother colors, while the colors fromwhich green is absent are desaturat-ed-i.e., contain some white. Thesesymptoms will indicate to the in-formed serviceman that insufficientcolor information is reaching thegreen gun. The reasoning behind

this may be outlined as follows.Color information at the green

gun serves two purposes: 1-It sup-plies the signal that turns the greengun on when green is being trans-mitted. 2-When green is not beingtransmitted, and other colors are,this color information cancels the Yinformation present at the greengun, cutting the gun off, as ex-plained in our April article.

Insufficient color signal input tothe green gun, thus, will result ingreens of inadequate brightness inthe picture; it will also cause adesaturation of other colors, becausethe green gun will have some outputwhen it should actually be cut off,causing green to be mixed with theother colors.

A check on the signals applied tothe green matrix (see Fig. 3) revealsthat the trouble may lie either inthe -I or -Q channel, since bothsignals feed into the green matrix.(Y signal also goes to the matrix,but the trouble cannot be attributedto this channel because desaturationis present. Such desaturation wouldnot be associated with improperhue, if the Y signal input to thegreen gun was absent or inade-quate.)

Now then-since the other twoguns appear to be operating nor-mally and since -I signal is also

(Continued on page 44)

18TECHNICIAN July, 1954

Making the Most of

Your Test EquipmentPart 3 Polarity Checks on Transformers. Low -Frequency Probe

Sometimes transformer wind-ings are connected in series to ob-tain increased voltages; or in parallelfor increased currents-for instancewhen two 6.3 1, windings are con-nected in parallel to supply oneheavy-duty circuit. Or, a separateheater transformer may have to bewired up, with the low -voltagewinding in parallel with one alreadyin the circuit, to supply additionalcurrent. In addition to quickly corn -

TO 120 VAC LINE

O

V

3I5V

3.I

_TOSCOPEx

II6 3 V.

O

av

Fig. 1 A-Test setup for comparing polarityof transformer windings. B-Waveforms inphase. C-Waveforms oppositely phased.

paring transformer output voltages,to determine whether they are ap-proximately the same, a scope willquickly show which way to connectthe leads from the separate wind-ings. (It is better to use a scope thanan ac voltmeter for such tests sinceerrors in connections made when anac meter is used can damage the lat-ter. Example: unintentionally con-necting meter to high -voltage trans-former winding, when the rangeswitch is on a low -voltage setting.)

The first step is to connect the(120 -volt) primary windings inparallel, without regard to the po-larity of either secondary (see Fig.IA). Assume the two secondaries areto be connected in series to supply12.6 v. Connect the scope leads firstto X and Y, noting the waveshape

BY M. G. GOLDBERG

on the screen; then disconnect theleads from this winding and connectthem to V and W instead. If identi-cal polarities are observed (Fig. 1B),then to connect the windings inseries, X and W would be tied to-gether, making 12.6 v available be-tween V and Y. If, on the otherhand, the first waveform was in-verted with respect to the secondone (Fig. 1C), then Y and W wouldbe tied together, and 12.6 v wouldbe available between X and V.

If the two windings are to be con-nected in parallel, the same testswould be made. If, in the first test,the waveforms were as indicated inFig. 1B, we would connect Y to Wand X to V. If the results were asin 1C, Y would go to V and X to W.

When connecting windings in se-ries, a slight difference in the out-put voltage of each winding is un-important; for parallel operation,however, voltages should not varyby more than 3%, as a rule. Anydifference in voltage will be readilyapparent on the scope screen.

The reason why there shouldn'tbe more than a 3% voltage differ-ence between the windings con-nected in parallel is that the higher -voltage winding will draw more cur-rent if there is, and its rating mayconsequently be exceeded. The

.05 PROBE CABLEK MFD [CAPACITANCEj-IVV\-1(

TO 30-50RECEIVER -7- MMFD

TO SCOPE

Fig. 2-Schematic of low -frequency probe.

higher -voltage winding will furnishcurrent until its voltage drops toapproximately the voltage of thelower -voltage winding. The condi-tion is similar to the one presentwhen a 6-v battery is connectedacross a 4-v battery, and chargesthe 4 -volt battery, as well as feedscurrent to any external circuit pres-ent, while the 4-v battery "floats" onthe line.

The tests just described havemore applications than most techni-cians appreciate. Hardly a weekgoes by but what I use this trickfor some purpose or other. When,for instance, a new vertical trans-former is to be connected into a cir-cuit, and the lead coloring is hard toidentify, the method just describedwill be very helpful. I had a real doghere quite some time ago that was aheadache of all headaches! Pix wasfine but tone was miserable, and thething just wouldn't align right, yetthe discriminator transformer wind -


Fig. 3-Response curves of oscilloscope with and without low -frequency probe. The oscilloscopeon which the tests were made had fixed input resistance of 2 meg, which is reasonably high.

IDEAL RESPONSE_ _3 MC 2 MC I MC

I I

I

HORIZ. DOTTEDLINES INDICATEIDEAL FLATRESPONSE FORVIDEO TRACING10-4 MCI

N _NORMALI -F PASS3MC.2t

5 MC 25 MC

RESPONSE OF SCOPE WITHPOOR HIGH -FREQUENCYCHARACTERISTIC, WHENSWEEP GENERATOR ISCONNECTED DIRECTLYTO IT

RESPONSE OF SAME SCOPEWHEN PROBE SHOWN IN FIG2 IS USED BETWEEN SWEEPGENERATOR AND SCOPEINPUT

HEAVILY SHADED AREASHOWS RESPONSENORMALLY REQUIRED FORCORRECT VIEWING OF60 AND120 CYCLE ACAUDIO SIGNALS ANDDEFLECTION WAVEFORMS


Arcing Troubles in TV SetsBY MICHAEL CRAIG

High -voltage or flyback trans-formers are likely sources of arcsand leaks. In many cases, there maybe no visible signs of trouble, mak-ing the diagnosis much more diffi-cult. Sometimes a problem arises inwhich both high and low voltagetransformers play a part. Fig. 1shows a portion of the schematic ofa number of RCA models in whichsuch trouble occurs. In these receiv-ers, the 6W4-GT damper tubeheater winding is at approximately500 v dc to ground, because one sideof the winding is tied to the dampercathode. The normal B -plus voltageat the fuse terminal is 375 v, butdue to the boost voltage developedin the deflection and damper circuit,the voltage at the damper cathode is500 v or more. Because the 6W4-GTheater winding is the one closest tothe outer shell of the transformer,a number of cases of arc -over haveoccurred at the site indicated inFigs. 1 and 2.

Unless the arcing has beenlowed to continue for some time,with a larger -sized fuse than theone recommended by the manufac-turer present, this trouble can beeasily corrected either in the homeor in the shop. First remove thechassis from the cabinet. Next re-move the four nuts holding thetransformer to the chassis. Carefully

Fig. 1-Partial schematic of 1951 RCA direct -drive deflection circuit, indicating arc site.

pull the transformer half -shells farenough away from the windings; thespot where the arc -over or shortoccurred will be in plain sight whenthis is done. Slide an extra layer ofvarnished cambric or similar insu-lating material between the outerwinding and the shell, as indicatedin Fig. 2. This makes a permanentrepair. The writer has never had a

OUTEROUTERWINDINGGOES TO 6W4NEATER

SLIDE ADDITIONAL INSULATION BETWEENHALF -SHELL AND OUTER WINDING,INTOTHE POSITION INDICATED By THE DOTTEDLINES

Fig. 2-Sketch of low -voltage transformer,showing location of arc referred to in text.

call-back for a similar complaint ona transformer doctored in this man-ner. It is not necessary to unsolderany wires to make the repair, whichtakes only a few minutes.

The schematic shown in Fig. 1,showing a section of the circuit usedin 19 -in. '51 RCA sets, has a 4.7mmfd capacitor in the plate circuitof the 6BG6-G tube. Some of thesecapacitors tend to arc over inter-nally, producing an interference pat-tern on the screen similar to thatcaused by Barkhausen oscillation(see Fig. 3A). In addition, the edgesand borders of vertical objects inthe picture will be somewhat ser-rated and jagged, like the teeth of asaw blade.

One point to keep in mind whentracking down interference causedby arcing somewhere in the receiveris this: If the arcing occurs in a partof the high -voltage section wherer -f is present, one or more roughly -defined vertical bars or lines will bevisible, usually on the left-hand sideof the screen.

The width and intensity of thelines or bars will vary with thestrength of the individual harmon-ics generated in the circuit. Thesource of these undesired signals

may be the horizontal output tubeplate circuit, as in the case of thecapacitor mentioned; a section of theflyback transformer in which arcingis taking place; or the linearity anddamper circuits.

If the arcing or leaks occur in thedc high -voltage circuit, a series offine, dark horizontal lines or streakswill be visible on the screen (Fig.3B). Because some sort of filter isalways associated with dc suppliesin a TV receiver, the time constantof the circuit affected is much longerthan in the case of the "r -f' orpulsed section (i.e., the frequency islower). This will cause the fre-quency of interference developed inthis circuit to be, in almost all cases,below 15,750 cycles. The trouble willmanifest itself, in consequence, ashorizontal lines; the lower the fre-

Fig. 3A-TVI produced by arcing in 4.7 mfdunit In plate circuit of 6BG6-G (refer toFig. 1). B-Interference pattern that canbe produced by arcing at the hv dc terminal.

quency of the disturbance, thefewer the number of lines on thescreen.

Arcing due to poor contact at thepoint on the rim of metal picturetubes where the high voltage isclipped on, is a case in point. Thesmaller the gap, the greater thenumber of lines or interferencestreaks, and vice versa. The sameapplies also to poor contact at the


snap -in terminal on the side of glasspicture tubes.

Intermittent arc -over, either ex-ternally or internally, of the high -voltage filter capacitor (usually a0.0005 mfd unit) will give rise to asimilar effect, except that the fre-quency of arc or "pop -over" is muchless; the audible manifestations ofthe arcing, on the other hand, aremuch more evident. Turning downthe brightness control so that thepix tube draws less current willcause the high voltage to rise, tend-ing to promote the appearance ofthis intermittent fault.

AC vs DC Arcing

Arcing or corona in the flybacktransformer circuit will usually beheard as a hiss or sizzle, while anyleak in the high -voltage dc circuitwill give rise to crackling sounds, orsharp "pops." If the snap -in termi-nal on a glass pix tube is loose,spread its prongs slightly to improvethe connection. If the rubber nippleis worn or cracked, cover the hv

Fig. 4-Scotch tape placed as shown can beused to maintain firm contact at the hv termi-nal when suction cap is cracked or missing.

terminal with several short strips ofgood high -voltage tape (see Fig. 4),pressing the nipple firmly to theglass.

In some of the 19 -in. RCA '51models, arcing through the insula-tion between the "high" side of thehorizontal yoke windings and theadjacent vertical yoke winding maybe encountered. A few seconds afterthe arc starts, a short between thesepoints results in a narrow keystoneraster, from 11/2 to 3 inches wide(see Fig. 5). These yokes can be dis-assembled rather easily. If the arc-ing hasn't damaged the coils, a cou-ple of thin strips of high -voltage(heat -resistant) insulation can becarefully placed between the wind-ings, the yoke then being reassem-bled. Such a repair is recommendedonly as an emergency one; it is thewriter's experience that the sametrouble will occur at some other spotin the yoke. Installation of a new

Breakdowns in Transformers and Coils.Symptons, Causes, Remedies. Corona Effects

yoke is the best and safest solution.When a temporary repair is made,however, do NOT use regular blackhigh -voltage electrical tape for theinsulating material, since the heatin the windings will cause it to de -

Fig. 5-Narrow keystone raster resulting fromarc between horizontal and vertical deflectioncoils. Width of raster will vary with typeof circuit, location and degree of shod.

teriorate rapidly and break down.In some RCA '50 models, intermit-

tent arcing which causes the rasterto shrink in size or disappear en-tirely may be due to pressure ofthe insulated wires against the sharpterminals within the yoke itself. Thistrouble can be easily located if the

LUGS DIG INTO WIRESAT POINTS A,B,C AND D

Fig. 6-Sketch of yoke terminal lugs (coverremoved) indicating how wires can shod.

technician, with the set on, movesthe leads to the yoke, noting whethersuch movement or displacementof the wiring radically affects theraster shape or brightness, or causesarcing. If such effects are observed,the fault can be easily corrected byremoving the yoke and wrappinga narrow layer of high -voltage tapearound the wires at the points wherethey dig into the lugs-or rather, thepoints where the sharp edges of thelugs and the soldered ends of the

wires cut thru the insulation andshort out one or both halves of theyoke (see Fig. 6). Cut off any pro-truding wire stubs close to the lugs,when this kind of trouble is beingserviced.

A strip or two of high -voltagetape will correct the trouble whichsometimes occurs in early 16 -in. Ze-nith models, where the leads fromthe hv transformer winding feedingthe 1B3 heater rub against thetransformer core, and finally arcthrough to the latter. A simple cureis to use a strip or two of this tape

TAPE

HV TRANSFORMER

TAPESSTICKYSIDE OUT

1ST STEP

TO183

HEATER

FINAL POSITIONOF TAPE

Fig. 7-How to add additional insulation be-tween 1 B3 heater winding and flyback core.

in reverse (sticky side outwards),wrapping it around the wire to forma sort of loose tube (see Fig. 7).This will permit the tape to be slidalong the wire until it is betweenthe core and the heater lead, provid-ing additional insulation. The chassiswill not even have to be removedfrom the cabinet for this repair.

Still another case where high -

Fig. 8A-Arrows indicate corona area andpath of arc in Philco 21 -inch '53 set. B ---Changes in hv produced by line variations.

TO REMEDY ARCING,FASTEN STRIP OF HV TAPETO UNDER SIDE, THEN SPRAYWITH KRYLON

I B3-GT

HIGH -VOLTAGECAGE

AC LINEVOLTAGE INPUT

DC HIGHVOLTAGE

113 V 14,450 V

11 7 V 15,000 V

132 V 17,000 V

0


TERMINAL

SLOT

SLUG

- WINDING

ARC BURNSTHROUGH HERE

ENLARGED HOLECLEARS THREADSON ROD

REAR OFCHASSIS

Fig. 9-Sketch of Raytheon linearity coil,showing where insulation breakdown occurs.

voltage tape can be used to advan-tage is under the dome of the high-voltage cage, above the 1B3-GTplate cap, in Philco '53 21 -in. receiv-ers. In spite of the 3/4 -in. spacingbetween the cap and the top of thecage, cases of flashover betweenthese two points occasionally occur.The arc maintains itself, once thebreakdown occurs, until the rela-tively expensive hv transformerburns out, unless the customershuts the receiver off fairly soon. Inevery such case noted by the writer,the cause has been poor ac lineregulation (in small communities afew miles from the city). In one case,to cite an example, the measuredline voltage was 113 v, when the linewas loaded down at night withlights, oil -burner, dishwasher andelectric stove. In the daytime, whenthe trouble started, the line voltagewas up to 133 volts, with a propor-tionate increase in the pulse volt-age present at the 1B3 plate (seeFig. 8B). Fastening several thick-nesses of high -voltage tape to theunder side of the cage roof, as in-dicated in Fig. 8A, eliminated alltrace of corona and flash -over.

Arcs in Linearity Coils

Relatively little trouble is experi-enced with arcs and leaks to chassisground with linearity coils, in spiteof the fact that dc voltages between500 and 550 v are generally presentbetween such units and chassis. Twointeresting cases recently came tothe writer's notice, however, whichmay be worth describing.

In both instances, the linearity coilwas mounted within the high -volt-age cage near the width coil. Thefirst case involved a Raytheon 20 -in.receiver, in which the linearity coilwas mounted upright at the extremerear of the chassis, just inside thehv cage. Adjustment was made bymeans of the usual slug (see Fig. 9),

except that the slug was groundedto chassis through the push rod andcoil spring, the latter sliding alonga slot in the chassis; the slug wasmaintained in position through pres-sure of the spring on both sides ofthe slot.

Due in part to the fact that over500 volts was present between theslug proper and the coil winding,gradual disintegration of the tubingwall took place over a period oftime, and a flashover finally oc-curred, killing the high voltage. Toallow the customer to use the re-ceiver until a new coil was secured,the entire coil unit was lifted fromthe chassis (after removal of thespring) and taped up like an Egyp-tian mummy. Inasmuch as the pathto ground had now been interrupted,the short was temporarily elimi-nated.

Tubing Wall Defect

Another case involved a RadioCraftsmen 20 -in. receiver in whichthe linearity coil was held to the topof the hv cage by the usual metalsnap -in cap (see Fig. 10). The ad-justment slug fastens to a smallbracket which slides up and down aslot in the cage wall, and is held inposition by a thumb screw. Short-circuiting does not take place tochassis in this case, but occursbetween the inner winding of thecoil, through the tubing wall (wherea weak spot has appeared), to theslug surface, and out the oppositeside of the slug, to the opposite ter-

SHORT FROMSLUG TO

TERMINAL

RETAINERCAP

SLUG

TOP OFNV CAGE

SHORT FROM COILTO SLUG BURNSHOLE IN WALL

COIL WINDING

GROMMET

Fig. 10-Sketch of Radio Craftsmen horizontallinearity coil, indicating short-circuit point.

minal lug. The reason no short tochassis exists here is that thethreaded slug screw is set in a rub-ber grommet in the sliding bracket.

Shorts in a number of RCAKCS47 chassis occurred betweenchassis and the wires leading to thesocket of the 6W4-GT tube, at thepoint where the wires make a sharpdouble bend in threading under-

neath the tube and passing througha hole in the chassis (see Fig. 11).The insulation on the wires hadcracked, resulting in flashover. Aquick and permanent repair wasmade by sliding a "tube" made ofhv tape over the wires, at the pointwhere they go through the hole inthe chassis. (The "tube" is identicalwith the one described in the caseof the Zenith transformer.) As anadded precaution, a thin strip ofhigh -voltage insulation (a piece ofcardboard wrapped with electricaltape could also have been used) wasslid under the wires where they reston the chassis after emerging fromthe socket.

The repair just described can bemade by removing the cage door

SUPPORT

SLIDE TAPE OVERWIRES HERETOELIMINATE SHORT

RV CAGE(REAR)

VERTICAL SHELFINON-METALUCI

SLIDE INSULATIONUNDER WIRES ATTHIS POINT

CHASSIS

Fig. 11-Pictorial of section of RCA KCS-47Achassis. Short-circuit occurred at point X.

screws and lifting the door out ofthe way, without removing the chas-sis from the cabinet. If the wires,however, are badly burned, it willbe advisable to pull the chassis, re-move the rear cage plate and re-place the two wires. These are only6-8 inches long, and fasten to tiepoints beneath the chassis.

A somewhat baffling trouble oc-curred in an RCA 2T81 combo andother models using the same chassis.Arcing could be faintly heard as asubdued sizzle or hiss, with the vol-ume control turned down. Therewas no smell or smoke, but the out-lines of all figures showed whathas come to be known as a "cog-wheel" effect, the size of the cog-wheel "teeth" varying with the in-tensity of the leak. Since the leakoccurred (as was later discovered)within the insulating tubing of theflyback transformer, it could not beseen; even the sound of the arcingwas deadened. The arc occurred be-tween the coil teminal (see Fig. 12)and the bolt which runs clearthrough the coil form, and is usedfor mounting the transformer to themetal cage.

Since the coil itself was not dam-aged in any way, it was only neces-sary to cut away the burned coiltubing around the lug, insulate the



1

Shop Hints to Speed ServicingTips for Home and Bench Service Contributed by Readers

Neck Shadow RemedyOccasionally a slight case of neck

shadow is due to an inadequate flareangle in the yoke windings. To re-place the yoke is the easiest proce-dure, but it is also the most expen-sive. Before resorting to replace-ment, try this simple expedient; itworks fine in most cases:

Place the yoke on the bench withthe rear portion, out of which theneck of the picture tube normallyprotrudes, face down. Also obtain asmall soda bottle ("coke" type orsimilar), a soft rag, a small woodenblock and a hammer. Arrange theseitems as shown in the drawing. Thebottle-or that part of it which willbe outside the yoke-is wrapped inthe cloth to prevent personal injuryin case of glass breakage. Tap thewooden block smartly with thehammer several times, to increasethe angle of the yoke flare. Replacethe yoke, making sure that it's as

WOODENBLOCK

FRONT OFYOKE

YOKE(CROSS SECTION)

REAR COVER

BENCH-,

HAMMER

SODA BOTTLE

WRAP BOTTLE INCLOTH TO AVOIDINJURY IN CASEOF BREAKAGE

-YOKE FLARE

YOKE LEADS

closeclose to the picture tube bell as pos-sible. You'll be surprised to find howoften this gets rid of neck shadows.

Incidentally, I have never had a"coke" bottle break in the years I'veused this method.-B. 0. Riis,

Florida.

Critical Vertical SyncOn RCA models 2T51, 2T60 and

2T81, the vertical hold control ap-pears to have plenty of range of op-eration when it is rotated. However,if the control knob is manipulatedin the usual manner, the pictureslides by just when it appears thatit should be locking in place, unlessthe control is turned very slowly. Atfirst the cause appears to be lack of

sync. However, a check will usuallyshow that resistance of the controlhas gone up to 2 meg or more. Con-sequently, there is a very smallangular rotation over which lockingcan take place, and adjustment be-comes critical. Replace the faultycontrol with one of the correct value(1 meg) or, to effect an emergencyrepair, shunt the defective unit witha 1-meg fixed resistor.

If the control checks okay whenthe described symptom is present,replace the 10k resistor shown in theaccompanying sketch with an 18kunit. The sets referred to use a com-paratively small vertical sync pulse,and the suggested change will raisethe pulse slightly.-M. G. Goldberg,St. Paul, Minn.

Haste Makes WasteSylvania chassis 1-509-1 uses

paralleled horizontal output tubes(6BG6's) and paralleled dampertubes (6V3's). If you want to blow atube, just substitute one 6BG6 at atime, and turn on the set while theother (parallel) 6BG6 is still warm.Maybe you will get away with sucha procedure-but maybe you willblow a tube. At any rate, you willbe trying hard to blow one. Whathappens is this: the already warm6BG6 will start operating before thenew one, thus drawing the majorportion of the current. This willoverload it. So, whenever you can,replace both tubes at one time in thecase of all paralleled tubes. If youcannot do this, give the set a fewmore minutes to cool down prior toturning it on again, when only oneof the tubes has been replaced. Thiswill permit both tubes to start coldand to heat uniformly, drawing equalcurrent, and thus preventing anoverload on one of them.-James A.McRoberts, Brooklyn, N.Y.

Convenient Probing LampI find frequent need for using a

pen -light in my bench work, but Ihave discovered that the life spanof the tiny pen -light batteries is tooshort when the light is used fairlysteadily. To solve this problem, Ihave eliminated the battery by run-ning two leads from the pen -lightand connecting the leads to a suita-ble voltage source. (I use the fila-ment connections on a tube testersocket.) This provides a steadysource of current without the nui-sance of frequent battery replace-ment.-S. Sandler, Providence,Rhode Island.

Resoldering Phone TipsFrequently, because no new unit

is at hand, it becomes necessary torepair a break that has developed ina much -needed test lead or phonecord. The wire in these cords isoften delicate and hard to handle; ittends to fray and bend when an at-tempt is made to insert the wire intothe phone tip, as indicated in sketchA. To avoid this difficulty, wind apiece of thin no. 30 bare wire in aspiral shape around the wire that isto be inserted into the phone tip(see B). This keeps the end of thewire stiff, holds the loose ends inshape and keeps them from frayingout. It now becomes very easy toinsert the wire into the phone tip,which is held in a vise, and resolderit, as shown in sketch C. Tin the no.30 wire lightly after it has beenwound around the broken end ofwire that is being worked on, andbefore the end is inserted in the tip.-Joseph Amorose, Richmond, Va.

C=I=,WIRE TENDS J UNRAVELS HERETO BEND HERE

VISE

0

BARE NOTE WIRE

FILL PHONE TIPWITH MELTED SOLDERBEFORE INSERTINGTHE LEAD


A

Sch

emat

ic o

fLa

te M

odel

Hi-F

iR

ecei

ver

w1i

f"°A

°

0102

608

OS

CM

IXE

R

FC

11.1

0-.

511

0104

0

;AO

an 1+

J.

1W.

-01

068

A6

III A

P A

M -

FY

110

0104

68A

620

2I -

F A

M -

FM

000

4'

11,1

1.

Ne.

"

,11

0105

GA

LSR

AT

IO P

ET

0; fl

ram

sIT

Ina

at r

r%

r-i

t-;

-i-

1T

d,.

(V%

07

C 1

30o

I19

244:

1:40

.0v1

011

6 A

V6

AM

OC

T.

AV

G C

LAM

P

VH

S,

6BA

6R

.E. A

MP

.11

,

.0V

'4S

04

/S.

"NA

I°

Ale

k,(0

N O

TE ""

Trt

110=

1:17

117

P O

SIT

1041

.

tais

a....

A%

VA

N..

1.0.

1.10

1102

7 O

R01

0111

111

1101

0O

RM

---

---

OT

TO

mam

a, 0

01 y

e0.

0000

.H

IM W

W1.

.. 0V

.

ON

O M

OR

I 04

00

PIL

OT

LIN

O.

V10

TA

04 1

2 A

XT

111

AU

DIO

0107

8V

ICIS

Ah

12A

X7

h 12

AX

72-

KE

U01

0

140

1612

;41:

: 1

0047

011

irt;-

-M

al

, 31

74...

POP1

00 O

-.4

1-z.

mu

ro.v

!

VIO

BB

12A

X7

PH

AS

E IN

VE

RT

BR

O.

PIO

rir

.71

4Z.1

RE

CO

RD

CH

AN

GE

R S

CH

EM

AT

IC

VIII

5738

7R

EC

TIF

IER

101

i 100

411,

MO

N

PR

E-A

MP

LIF

YR

CIR

CU

ITD

IAG

RA

M

V 1

106V

6P

OW

ER

AM

P

0 20

160

07P

RE

-A

MP

CR

OS

S O

VE

RN

ET

WO

RK

/.!or

4:.

C 1

03 w

1.1

11ta

ggD

O 0

0IC

.1.1

7S10

,

=

GENERAL DESCRIPTION

Radio ChassisThe radio chassis used in this in-

strument is the new Capehart CR-129, an 11 tube high fidelity chassis.The tuner section of this chassis is afairly conventional AM -FM re-ceiver. However, the RF deck hasbeen designed with particular atten-tion to the radiation of the FM oscil-lator. This has been kept extremelylow so as to comply with new FCCrequirements. The ratio detector hasbeen improved for easier tuning andlow distortion. A 10 KC filter is em-ployed in the AM detector circuitto eliminate beats between adjacentAM stations which can be so objec-tionable in a high fidelity receiver.

Other Features

A 4 -position band switch permitsthe user to select FM, AM, phono-graph, or an auxiliary input jackwhich may be used for TV sound, atape recorder, or some other soundsource. The selected audio signal en-ters the audio section of the receiverthrough a compensated volume con-trol which provides continuous com-pensation so that the proper overalltonal balance will be maintained re-gardless of the volume control set-ting. Following the volume controlis a 12AX7 twin triode used as thefirst and second audio amplifierstages. Between these two stages isthe tone control system. Two concen-tric controls provide either boost orcut-off of either the bass or the trebletones. The wide range and continu-ous action of these controls permitsthe user to alter the tonal balance tosuit his taste. The normal operatingposition of these controls is in the

SINGLE CHASSIS AM -FM TUNER AND HI-FI AUDIO AMPLIFIER

center or flat position. The secondaudio amplifier is followed by twodriver stages, again a 12AX7 twintriode. The grid signal for the firstdriver is obtained from the secondaudio plate. The second driver re-ceives its signal from a divider net-work between the two driver plates.The high gain of the 12AX7 and useof close tolerance resistors keeps thedriving signals to the output gridswell balanced. Approximately 16 dbof inverse feedback from the sec-

ondary of the output transformer isapplied to the cathode of the firstdriver stage. This reduces distortionto the point where it is undetectableat even high levels. The outputstage is comprised of two 6V6's inpush-pull coupled into a well de-signed output transformer. The re-sulting frequency response of theamplifier is from 20 to 20,000 cpsplus or minus one db. The outputstage will deliver a peak of approxi-mately 14 watts. At 10 watts, thetotal harmonic distortion is less thanone percent.

Record ChangerThe record changer used in this

instrument is a new high fidelitychanger made to fit Hi Fi "specs."While it contains the same basicchange mechanism as earlier models,there have been several improve-ments made which puts it in thehigh fidelity quality field. The baseplate of this changer is die cast, pro-viding greater rigidity than the ear-lier stamped steel base plate. A new4 -pole, 4 -coil motor with a dynami-cally balanced rotor is employedwhich keeps motor noise and pick-up hum to a minimum and insuresconstant speed. A new laminated

HIGH-FIDELITY RECORD CHANGER MODEL 400 HF

turntable is used which has beenprecisely formed to eliminate wow.The turntable thrust bearing is aselected three -ball bearing withmirror -finished surfaces, providingsilent turntable operation. An alu-minum die cast tone arm with plug-in pickup heads is used, enablingthe use of several different car-tridges as the user may desire. Thepickup supplied with the instrumentis the variable reluctance unit withthe latest wide range dual sapphirestylus. The output of the pickup issilenced during the change cyclesby a muting switch, assuring silentoperation between records.

Record CompensatorThe output of the pickup cartridge

is fed to the radio chassis through arecord compensator and a preampli-fier which provides the necessarycompensation and gain for the varia-ble reluctance cartridge. The recordcompensator is a five position switchlocated conveniently on the front ofthe record changer drawer and en-

ables the user to properly correctfor the recording characteristic ofthe record being played. In the firstposition, compensation is providedfor LP records using the Columbiamodification of the NAB recording

HIGH-FIDELITY SPEAKER SYSTEM

OIFFILACIONAL X011MICA Filf?...141.=711.310.4 --0

SFLEVID LOW MOMILFILIO0LICEIL

-4SWIM 01510* BASE NOMSOUND CxAMBFR OCCuP10

FuLLY ONE HALF OF CANN.

curve. The second position providesthe newly established Audio Engi-neering Society play -back compen-sation which has been adapted bymany record manufacturers today.The third position is a flat position,providing compensation for the pick-up itself in the low frequency re-gion, but maintaining a flat high fre-quency response. The fourth andfifth positions provide two degreesof high frequency cut-off, and areuseful in eliminating surface noisewhen playing records with a poor orworn surface.

REPLACING STYLUSASSEMBLY

The needles used in this recordchanger are formed in a "dual sty-lus." The micro -groove (33-45) sty-lus is identified by its color, whichis red; the standard (78) stylus isuncolored.

To replace the styli assembly:(1) Remove the pickup head as-

sembly from the tone arm. (2) Re-move the needle control knob bypulling up on said knob. (3) Removethe two screws holding the cartridgein the head. (4) Press down on theexposed spring and remove the "C"washer. (5) Remove the spring byreleasing the tension slowly. (6) Re-move the flat washer the springrests upon.

To replace the styli assembly, re-verse the above procedure, makingsure that pressure is applied onlyto center point at bottom of unit.When replacing the needle controlknob, make certain that it is alignedproperly. The direction of the arrowon the knob should indicate thenumbers which correspond with theneedle which is placed in the usableposition. The shaft grooves areslightly off -center to insure properreplacement.


MR. BOSS MAN: Are You

Looking for More Help?

Give your "learners- a chance-don't marry'em off permanently to a broom or a dustrag.

The manpower situation has easeda bit so far as the TV -radio servicedepartment is concerned. There aremore good men available now thanat any other time since the warended.

In view of the fact that the em-ployment situation is better, dealerswho take a far-sighted view realizethat now is the time to latch on togood men. In tomorrow's color -TVera, it may be too late, since the ad-vent of full-scale color commerciallyis more than likely to create an acutetechnician shortage of several years'duration.

Let's see what kind of men areavailable now; for purposes of dis-cussion, let's throw them loosely intotwo groups.

One group-the most populatedone-is composed of men who havelittle or no actual bench experienceon home equipment. This group,mostly youngsters, includes "gen-iuses" who've obtained a smatteringof knowledge by doing things them-selves; those who have completedcourses in any of the various schools,veterans who worked on electronicequipment in the armed forces, andothers who have done more or less"stereotyped" assembly or inspection

The Manpower Market is Better, but JobApplicants Should Be Carefully Screened

work in electronic factories.Group 2 is composed of experi-

enced technicians who know thework inside and out.

In Group 1 there are a great manypromising men, and numbers of themare extremely eager to get into thefield with both feet. In spite of thefact that dealers can hire suchgreenhorns or little -experiencedmen at very small salaries, few aredoing so today. TECHNICIAN edi-tors feel that any shop employing astaff of full-time servicers shouldexplore the idea of taking on one ortwo bright youngsters for training.

With respect to hiring experiencedtechnicians, it is now possible to bemore selective, and check a pros-pective employee's qualificationscarefully.

The fact that a man has been mak-ing big money with some large serv-

icing outfit should not lead the shopowner to hire him without first mak-ing a thorough investigation of theindividual.

Here are the things to delve intowhen considering the application ofan experienced servicer:

1. Is his experience as extensiveas it should be? Check on this byasking the man a number of tech-nical questions on a variety of prod-ucts you service. Try to find out ifhe is psychologically adaptable toservice anything you may turn overto him. (This will preclude the pos-sibility of engaging a "specialist"who likes this and hates that.) Callhis former employer, or one of hisformer associates, and inquire abouthis experience and versatility.

2. Check the man's employmentrecord carefully, looking out for


Find out in advance if this is the man for you Sketchy hiring wastes time and money.


Better Contrast!

Longer Life!

Availability!

Make old sets like new... have more satisfied customers!

Interested in new sales records? You'll be heading in thatdirection when you replace old picture tubes with new SylvaniaAluminized Tubes.

Sylvania Aluminized Picture Tubes give terrific performance.They make old sets better and brighter than new by providing whiterwhites-blacker blacks . . . a 6 -times better picture contrast.

Sylvania Aluminized Picture Tubes are now available in mostsizes for all popular TV sets. In other words, with SylvaniaAluminized Picture Tubes, you give your customers the best possiblebuy and the best possible service, including a full one-year warranty.

cos -rRemember, millions of set owners see and hear about Sylvania

Picture Tubes on the nation-wide weekly television show"Beat The Clock." They know that they are famous for qualityand dependability. For full details about aluminized tubereplacement, write for Sylvania's "Aluminized Picture TubeReplacement Guide." Address: Dept. 4R -4206A, Sylvania NOW!

LVAINIASylvania Electric Products Inc. 1740 Broadway, New York 19, N. Y.

In Canada: Sylvania Electric (Canada) Ltd.University Tower Building, St. Catherine Street, Montreal, P. Q.

LIGHTING RADIO ELECTRONICS TELEVISION

. TECHNICIAN July, 195427

"Tough Dog" CornerDifficult Service Jobs Described by Readers

Horizontal DriftIn an Olympic model 17T20 the

horizontal oscillator would go outof sync several times during a pro-gram, and would eventually reach apoint where it would stay out andcouldn't be brought in until the setwas turned off for a while.

Most often tubes in the horizontalcircuits which are weak, develop ahigh resistance leak or are otherwisedefective, cause such symptoms.Other common causes, in my ex-perience, are leaky capacitors andplate loading resistors which changevalue as they heat up. Also, hori-zontal oscillator and phase misad-justment can cause sync instability.

I checked the horizontal oscillatorand phase alignment, substitutedtubes, checked for leaky capacitors,resistance changes, poor solderedconnections, changes in voltages andresistance readings in coils andtransformers in the horizontal cir-cuits. The only thing that was not

okay according to the serviceformation was the slight variation inthe resistance readings of the hori-zontal oscillator and phase coils. Thereadings were somewhat low. Thiswas at first overlooked, as coil re-sistance readings often are differentfrom those given in service informa-tion, even though the units are nor-mal. After much more fruitlesssearching throughout the horizontalcircuit, just to be sure I decided tochange this combination unit. Sureenough, the trouble was completelycured.

The cover was removed from theold coils to see if any defects couldbe noticed. The coils and all internalconnections looked okay, but a faintburnt odor came from one of thecoils. Apparently it had some inter-nally shorted turns which, whenplate current was flowing, wouldcause it to overheat. The heat would

in -

apparently cause still more turns toshort. Thus, the coil inductancewould gradually change and thehorizontal oscillator would drift fur-ther and further off frequency.-Charles Garrett, New London, Conn.

Obscure Horizontal PullThis trouble occurred in an 810

model GE, but could easily occur inother makes. A strong 60 -cycle pullin the picture twisted the edges ofthe raster into an "S" shape al-though horizontal lock was good atall times. As a temporary test, I re-moved the plate supply of the hori-zontal oscillator (normally con-nected to the boosted B+) andhooked it to the 5U4 low -voltagesupply. The picture became normal.The original plate connection wasthen restored. A scope test atthe damper tube's heater -cathodeshowed an intense 60 -cycle signalmixed with the usual signal for thatpoint.

With the damper tube (5V4) stillhot, I quickly disconnected one of itsfilament leads. Since it takes about20 seconds for the filament to cooldown, you can get rectification dur-ing this period with no filament volt-age applied. During these 20 sec-onds, a normal picture was evident;also the 60 -cycle ripple in the kick-back voltage, as viewed on thescope, disappeared. Replacing thedamper with another 5V4 solved theproblem.

Since the heater and cathode ofthe 5V4 are normally tied togetherinternally, no short test can be madeon a tube checker. It seems possiblethat a part of the cathode not nor-mally touching the filament shortedto the latter, resulting in 60 -cycleinjection into the horizontal circuits.-Edward N. Zibulka, Cincinnati,Ohio

Intermittent RasterThis Admiral stopped me for a

while. It was a 19F1 chassis; thetrouble was intermittent in nature.The set would operate normally forperiods of time ranging up to anhour and a half. Then, with a loudcrack or snap, the brightness woulddisappear, then reappear, and the setwould resume normal operation.

At first the picture tube was sus-

pected, but when the trouble ap-peared, no flash appeared in the crtneck. The trouble persisted evenwith the high voltage lead and pic-ture tube socket disconnected. Vis-ual inspection of the chassis, yoke,and flyback transformer revealedno flash or arc.

Finally, after hours of fruitless in-vestigation, I found that the symp-toms became steady if I applied 130volts to the set by means of a variac.Then, using an insulated screw-driver as a stethoscope, I traced thenoise to C-5, a 20 mfd, 475 v de -coupling condenser, connected fromthe vertical output tube plate returnto its cathode. The condenser wouldarc internally and then heal itself.Since it is connected to the boostvoltage from the damper circuit, itwould kill the high voltage beforevertical collapse occurred, thus cov-ering a clue that would have pointedto the vertical circuit.-TommyHublit, Imperial Beach, California

$ For Your "Tough Dog Story"

Have you tangled with adifficult or obscure serviceproblem recently? Write it up,telling us how you licked it,and send it to "Tough Dog"Editor, TECHNICIAN, Cald-well -Clements, Inc., 480 Lex-ington Ave., New York 17,N.Y. $10 will be paid forusable material. Unaccept-able items will be returned tothe contributor.


When the profile of the Cadillaclooked like this

It was understandable that the profile of a V.O.M,might look like this

But this is the profile of today's Cadillac

And if you buy a V.O.M. that is truly of today itwill have a profile like this

STREAMLININGsignifies thedifference!

in cars, streamlining symbolizes the tremendousadvances in automotive engineering and perform-ance. In fine test equipment, too, streamlining.signifies the difference.The flush switches, dials and jacks of the Smoothiemake it easy to slip in your pocket, carrying case ortool kit, eliminate snag hazards on your bench.

But even more-the streamlining expressesexternally the advanced internal design whichmakes the Triplett Model 630 as superior to theobsolete knobby bumpy -faced testers as theCadillac of today is to the Cadillac of fifty years ago.These internal design features include such devel-opments as selector switch of molded construction,completely enclosed; elimination of harnesswiring, etc. Your most frequently used tester-your V.O.M.-should be the best-the one ofwhich many thousands are in use in laboratoriestoday-the Smoothie, Triplett Model 630 Volt -Ohm -Mil -Ammeter, $39.50 net. Ask your parts jobberor write Triplett Electrical Instrument Company,Bluffton, Ohio.Only Triplett offers you a ten day free trial on alltest equipment.

the SMOOTHIEthe only streamlined V.O.M. with a smooth face

630Volt -Ohm -Mil -Ammeter

COLOR SHORTS NEW ITEMS BOWAT PARTS SHOW

LUCKY PRIZEWINNERS at Syl-vania's recent color TV clinic inPaterson, N.J., got their awardsfrom Roxanne, lovely and popularTV star. Sylvania's Peter L. Langerexplained the problems of color TVat the clinic. More than 400 techni-cians attended. Grand prize was Syl-vania's new color dot generator,model 506. The prizewinners, shown

with Roxanne in the photo, are, fromleft to right: Howard Buckner(Paterson) ; Lester Pawlyk (Mid-land Park) ; Roxanne; Frank Car-bone (Paterson) ; James Forzono(West Haverstraw) ; and grandprizewinner William Dunn (West-wood).

THE KANSAS CITY -ST. LOUISarea was the scene of a recentlyconcluded color training program fortechnicians sponsored by the Hoff-man Sales Corp., local distributorsof Hoffman TV. The 14 -lecture, one-night -a -week course attracted 800students. An 8 -page lesson wasmailed to participating techniciansprior to each lecture, giving them achance to study the material in ad-vance. A $5.00 fee was charged forthe course to cover printing, mailingand other expenses. An additional900 students took the course bycorrespondence only.

IMPROVED VERSION of theLawrence single -gun tube, desig-nated the Chromatron PDF 21-3,was announced by Richard Hodgson,prexy of Chromatic TelevisionLaboratories. Using a rectangularglass envelope instead of the earlierbell -shaped cone, the re -designedtube is said to permit a 20 percentreduction in cabinet size withoutchanging picture size. The tube fea-tures a new Chromopac (color griddeflecting structure at the front ofthe tube), which is said to afford areduction in possibly objectionableradiation.

DU MONT'S 19 -IN. Chroma-SyncTeletron will be ready to be used insets this fall according to Bill Scales,general sales mgr. of the manufac-turer's CRT Division. Early deliver-ies will permit the tubes to go intosets marketed during the pre -Christmas selling season. This colorcrt was recently demonstrated tomembers of the FCC, along with theMulti -Scanner, discussed in thisspace last month.

RMS ANTENNA COLOR FORUMwas conducted by Martin Bettan inHaledon, N.J. Pro -and -con discus-sion of various antenna types, andthe role they will play when colorTV looms big, lasted for 31/2 hours.Because of the difficulties that maybe caused even by slight ghosts, ro-tators may become necessary forpinpoint orientation even in strong-signal metropolitan areas, it waspointed out.

AN ADMIRAL COLOR RE-CEIVER has been purchased by theChicago School of Television Serv-ice, 1538 W. 63rd Street, for use ina color training course. H. M. Rabin,the school's director, believes hisschool is the first in the Midwest tohave a color set for this purpose. Asecond Admiral receiver is soon tobe purchased. The six -lesson course,which extends over a three-weekperiod, will be open to TV servicepersonnel, as well as presently -en-rolled students.

THE RCA COLOR TV BOOK,Practical Color Television for theService Industry, though releasedlast December, is in its 2nd edition.The enlarged text (80 pages) sellsfor the same $2.00, but includes ad-ditional data on tests instrumentsand servicing techniques. Completecircuit diagrams have been incor-porated for the manufacturer's CT -100 home color receiver. RCA is alsooffering a 9 -lesson home -studycourse in color, at no charge, on atube purchase deal. The promotionaloffer, which will be handled by RCAtube distributors, is open up to No-vember 15, 1954.

Technical new products on pgs.32, 34, 38, 40, 42, 48

Just being felt, in many respects, isthe impact of the Chicago Parts Show,which closed down little over a monthago. New items, new lines, new trendshave started industry wheels turning inseveral new directions.

A NEW HI-FI TAPE HEAD, promising re-sponse from 20 to 20,000 cps at the 7.5 -in. speed with increased dynamic range,decreased noise and decreased distor-tion, is said to yield performance onhome -type recorders equivalent to thatnow achieved on professional equip-ment. Dynamu Magnetronics Corp.,Maico Bldg., Minneapolis, Minn., makerof the heads, has conversion kits forvarious standard home recorders.

LINE OF INTEGRATED TEST EQUIPMENT,THE WESTON 980 LINE, includes calibra-tor, analyzer, sweep generator, scope,tube checker and vtvm, is planned tosimplify and speed up service work. De-signed to work with each other, theseinstruments may be used for a stream-lined alignment procedure that elimi-nates multiple leads to the TV receiver.Calibrator introduces marker pips byintensity modulation of scope beam.New method is said to eliminate re-sponse -curve distortion. Weston Elec-trical Instr. Corp., 614 FrelinghuysenAve., Newark 5, N. J.

FENTON CO., 15 Moore St., New York4, N. Y., manufacturer of wires andcables, has entered other fields. One ofits several new lines is a series of Fen -tone boosters and UHF converters in-tended to reverse the trend toward hid-ing these units inside or behind the TVset. Decorator -styled units may alsoact as lamp, aquarium or plant vase.

NATIONAL CO., INC., 61 Sherman St.,Malden, Mass., makes its bow in the Hi-Fi field with an AM -FM tuner, 2 Hi-Fiamplifiers and a separate preamp-con-trol unit. Tuner permits simultaneousAM and FM output for pickup of bi-naural broadcasts . . . RAULAND-BORGCORP., 3515 W. Addison St., Chicago 18,Ill., also featured a new audio line.Their Green Gem sound systems, pri-marily for fixed and mobile PA set-ups,include amplifiers, speakers, enclosures,microphones, disc players and accessoryitems.

VIDONAIR indoor antenna is said tomaintain peak VHF -UHF response fromChannel 7 through Channel 83. In addi-tion, replaceable Power -Coupler cart-ridges, which act like tuning strips in afront end, are inserted to peak responseon any channel from 2 to 6, dependingon local conditions. A broad -band cart-ridge, also available, is for use whereentire low VHF band (2 to 6) is to bereceived. Introduced by Tunkl Indus-tries, Inc., 3714 Montrose Ave., Chicago18, Ill.



rti

11 HEAVY-DUTY

II TOP-QUALITYS PLIERS KIT

with10 CBS-Hytron Pliers Kit Stamps

PICK UP THESE FINE IMPORTED TOOLS. Examine the beautiful finish of theirdrop -forged tool steel. Try their comfortable handle grips. Feel the precisebalance . . . the powerful leverage. Go ahead! Cut some eight -penny nails.Like cutting cheese, wasn't it? And not a trace of a nick in the tough, care-fully matched jaws.You will be proud to own these husky, quality pliers. Tested . . . guaranteed. . . they can take it. And did you notice that two are unique? Nothing elsejust like them . . . they are "musts" for your tool kit. Yes sir, this free PliersKit (packed in an attractive, handy plastic case) is an offer you cannotafford to miss!

The 61/2 -inch Diagonals are husky, box -joint, fully polished sidecutters with precisely matched jaws. Size is right: Compact,but big enough . . . with comfortable, full-fashioned, full -polished handles . . . to do repeated, tough cutting jobs withease.The 8 -Inch Long -Nose is unique. Extra -long (23.1 inches),spring -tempered jaws combine with extra -long, knurledhandles for powerful leverage. Hand -honed cutting knives.Beautifully chrome -plated.The 6 -Inch All -Purpose is also unique. Combines: Flat andround nose. Jaws shaped for positive gripping. Two wirestrippers. Two side cutters. Finish of handles is gun-metal;jaws are fully polished. This tool has everything.

Manufacturers ofofReceiving Tubes Since 1921

RECEIVING TRANSMITTINGTECHNICIAN July, 1954

CBS-HYTRON Main Office: Danvers, Mass.

LIMITED OFFERFrom July 1 through August 31 . . . YourCBS-Hytron distributor will give you 1Pliers Kit Stamp with your purchase of25 CBS-Hytron receiving tubes.

Get This Pliers Kit Stamp Book . . .

and stamps from your CBS-Hytron distribu-tor: One Pliers Kit Stamp for 25 CBS-Hytron receiving tubes. Each Stamp is im-printed with your CBS-Hytron distributor'scode number. Redeem your Stamps with him.This offer is valid only in areas where suchoffers are legal . . . and it is limited: July 1through August 31. Don't miss it. Be sure toget your free CBS-Hytron Pliers Kit. See itat your CBS-Hytron distributor's . . . today!

A Division of Columbia Broadcasting System, Inc.

A member of the CBS family: CBS Radio CBS Television Columbia Records, Inc. CBS Laboratories CBS -Columbia CBS International and CBS-Hytron

SPECIAL-PURPOSE TV PICTURE TUBES CRYSTAL DIODES AND TRANSISTORS31

New Shop EquipmentTest Instruments, Tools, Adapters

Hexacon SOLDER IRONSmall size, light weight and bent

design permit more accurate controlover close work with the Hatchetsoldering iron. Efficient design is said

to result in performance comparableto irons with larger tips and higherwattage ratings. Available in 25 w.with 1/8 -in. tip (cat. no. 2511) or in30 w. with %o -in. tip (cat. no. 2611).Available for 110 or 220 v, ac or dc.List price, $5.50. Hexacon ElectricCo., 180 W. Clay Ave., Roselle Park,N. J.-TECHNICIAN

EICO SCOPE & METER PROBES

3 probes for oscilloscopes and 2for vtvm's have been added to theEICO line. Scope direct probe,model PD (kit, $2.75; wired, $3.95)is for TV waveform tracing in low -Zor low -frequency circuits. Elimin-ates stray pick-up and signal re -radiation. Scope low capacity probe,model PLC (kit, $3.75; wired, $5.75)is for TV waveform tracing in high -Z, high -frequency or wideband cir-cuits. Eliminates distortion due tooverloading or frequency discrimi-nation. Scope demodulator probe,model PSD (kit, $3.75; wired, $5.75)permits the oscilloscope to be usedas a waveform tracer and alignmentindicator in TV and radio r -f and i-fstages. Demodulates carriers be-tween 150 kc and 250 mc.

VTVM r -f probes, model PRF-11or 25 (kit, $3.75; wired, $4.95) arefor r -f measurements up to 250 mc.Accuracy ±10%. Model PRF-11 or25 is for a vtvm with an input of 11or 25 megohms, respectively. Elec-tronic Instrument Co., Inc., Brook-lyn 11, N. Y.-TECHNICIAN

Smith DRILL ADAPTER KIT

This kit permits drilling holes upto in. with a 1/4 in. electric drill.Drills can be converted to accept 4different sizes of bits. Two allen-head set screws on the adapter gripthe drill bits for smooth operation.Kit contains adapters for drill bitsizes 5/16, %, 7/16, and in., packedin a re -usable partitioned lucitebox. The complete kit with hex keyfor tightening alien screws sells for$1.98. Herman H. Smith, Inc., 2326Nostrand Ave., Brooklyn, 10, N.Y.-TECHNICIAN

Pomona SOCKET ADAPTER

Inserted between the base of thetube and the tube's socket, theseadapters facilitate voltage, resist-ance and other measurements fromthe top of chassis while the receiverunit under test is in operation.Available types include 8 -pin octal

and 7- or 9 -pin miniature adapters.All feature extended test tabs foruse with alligator clips or test prods,low circuit losses or circuit loading,high insulation and phenolic con-struction. Pomona Electronics Co.,524 W. Fifth Ave., Pomona, Calif.-TECHNICIAN

IRA CRT TESTER -RESTORER

Model D-60 is intended to restorethe emission of TV picture tubes.Operating principle is based ontechnique used in originally acti-vating new picture tubes after de-gassing and sealing. Unit also testsemission from cathode, measures re-storability and tests for internalshorts and leakage. International Re-search Associates, Div. of IRESCO,Inc., 2221 Warwick Ave., Santa Mon-ica, Calif.-TECHNICIAN

Dreier DOUBLE HACK SAWThe frame of the "Double Hac-

Saw" mounts two 12 -in. blades: Oneis fine-tooth for light work; theother is coarse -tooth for heavier

work. Each blade cuts a 5 -in. di-ameter. A single turnbuckle tight-ens both blades at the same time.Tight blade tension, says the maker,increases cutting speed and accu-racy, reduces blade breakage.Dreier Brothers, Inc., 5642 LakePark Ave., Chicago 37, Ill.-TECHNICIAN

Miller CRT TESTER -RESTORER

As a tester, model D-60 detectsinternal shorts and heater -cathodeleakage, permits measurement ofemission at normal operating volt-ages and checks restorability of thecathode. As a reactivator, the D-60heats the cathode for a specified pe-riod with a controlled current, thenseasons the cathode at higher tem-perature, also boiling off gases. Thisprocedure is based on activationand seasoning techniques used fornewly -manufactured tubes. Operat-ing instructions provided. Dealer'snet, $89.50. Miller TV Co., 2840Naomi, Burbank, Calif.-TECHNI-CIAN

EICO FLYBACK -YOKE TESTER

Model 944 tests flybacks and yokesin or out of the TV set. Operatingon the grid -dip principle, it is saidto detect even one shorted turn.Separate calibration for air -core andiron -core flybacks. Can also test thecontinuity of other coils. Model944-K, kit, $23.95; factory -wired,$34.95. Eico, 84 Withers St., Brook-lyn 11, N.Y.-TECHNICIAN


Arcing Troubles in TV Sets

(Continued from page 22)bolt with several layers of high -voltage tape, and then reassemblethe unit. This was easily done afterthe chassis had been removed fromthe cabinet, and the 4 self -threadingscrews holding the back to the restof the cage taken off.

In some of these models a wireloop holds the high -voltage lead inposition, as shown in Fig. 13. If no

TO CAP V'

7w:r ,

MC BURNS

OWERE

;

arAaAGE

; METAL BOLT

TO 61106-t

: '

- E : To FRAME

TO CATERS

4 yinDIAMETER OFINSULATIMG FORM

,0, IIII3-GT EXAGGERATED FOR

CLEARNESS

, - - w - , ...-Fig. 1 2-Flyback transformer mounting, show-ing site of arcing to bolt referred to in text.

grommet is present in the loop, arc-ing through the wire to thegrounded loop may occur, causingthe full high voltage to be impressedon the 470K series resistor. The re-

sistor will overheat and arc over,under the circumstances. To correctthe trouble, wrap a layer of tapearound the wire where the arc oc-curred, place a grommet in the loopfor insulation, and replace resistor.

During the long summer stretchesof rainy weather, receivers in high -humidity areas are apt to developcorona troubles. The author hasserviced a number of sets where thewood in front of the metal picturetube rims has absorbed moisture,with the result that, in the dark,hundreds of very fine coronastreamers could be seen emanat-ing from around the edge of the crt.Even though the hiss and sizzlefrom this corona effect could easilybe heard throughout the room, noeffect on picture or sound was evi-dent in most cases. Smearing thewood around the rim of the tubewith corona dope helped consider-ably to relieve the condition; inseveral cases, where the customerfollowed the suggestion that he op-erate his set an extra hour or so per

day, to keep the wood dried out asmuch as possible, the improvementwas greater yet. When the rainsstopped, and a dry spell followed,all trace of this corona disappearedof its own accord.

During the humid spell, not a sin-gle case of the kind just described

IT RUBBERGROMMET ISUSED HERE.

URDOWNOCCURS

Fig. 13-Arcing between lead and metal wireloop can burn up the 470k hv filter resistor.

cropped up in sets using glass pic-ture tubes, since the high -voltageanode in the latter clips into thebell of the tube (and the crt surfaceis thus not at a high potential toground). Leaks which did occurwith glass tubes were due to sur-face leakage, caused by an accu-mulation of moisture -absorbing dust.The trouble in such instances waseasily corrected by cleaning the crtsurface with a cloth dipped in a so-lution of "Tide," and then wipingthis surface thoroughly dry.

SERVICEMEN BOOSTED ON TV"Facts About TV Service'", a film short made by G.E. that recently appeared on the Dave Garroway Show, gave the TVtechnician some much -needed favorable publicity. Some of the sequences in the film, as well as the associated (condensed)script, are presented below.

11111111111111111111kiimmiamaYour set has more than 500 different parts.A good serviceman . . .

. . . an investment of thousands of dollarsfor electronic testing equipment . . .

hf 4sor

-T ..;ar Iwoe aft

Oat_ cgs

.1 ills' 00000000000000 ga It" 'ft.

Ofe.r.Z:446..-0,4:44444-. . . must know what each one does . .

where each one is located . .

. . . and another big investment in tubesand parts and trucks.

This requires intensive schooling, and plentyof practical experience . . .

Quick, economical TV repair calls for skill,knowledge and honest workmanship.


Antennas & Related ProductsIndoor and Outdoor Types; Installation Accessories

RMS CLOCK -ANTENNAThis RMS swivel -top UHF -VHF

indoor antenna with 6 -positionswitch includes in its base a clocksimilar to those used on clock -radiocombinations, to turn the TV set on

automatically at a predeterminedtime. The C1-2 Clock-Tenna has alist price of $19.95, and carries adouble guarantee by RMS and theSessions Clock Co. RMS, 2016Bronxdale Ave., New York 62, N.Y.-TECHNICIAN

ERC GUY -WIRE TIGHTENERSimplified anchoring of guy wires

and automatic control of tension, in-suring uniform cable tightness, issaid to be provided by the Tyzemguy -wire rig. The securing rig con-sists of the adjuster mechanism andthe tension -controlling compressionspring. The free end of a guy wireis passed through the lockingmechanism (attached to the tension-ing spring), pulled through until

the spring compresses, and securedby a locking lever. All parts arecorrosion -resistant. Eastern Rotor -craft Corp., Box 110, Doylestown,Pa.-TECHNICIAN

Channel Master ANTENNASThe Backstop, model no. 326-2, is

said to have no rear signal pick-up.It eliminates venetian -blind effectsin areas which lie within the field of2 different transmitters broadcastingon the same or adjacent channels.Front -to -back ratio is said to rangefrom 9:1 on channel 2, to 18:1 onchannel 6, reaching a peak of 20:1on channel 5. Uni-directional per-formance is due to the large reflect-ing screen area, 70 square feet. An-tenna incorporates Tripole design ofthe Champion antenna. List price(stacked), $63.90.

The Econo-Bow, model no. 418, isan all -channel UHF antenna in-tended for the low -price market.The gain of a single bay runs from4 to 7 db. The stacked antennaranges from 7 to 121/2 db. Preassem-bled. List price, single bay, $2.91.Channel Master Corp., Ellenville,N.Y.-TECHNICIAN

Danforth ANTENNA MOUNTSBuilt as single aluminum units withintegral guy rods, Mightie Mountsare said to eliminate the need forspecial or additional roof mounts,masts, guy wires, guy rings orclamps and screw eyes. Designed for1 -man installations, the mounts comein three sizes: MM -4, 4 ft.; MM -6,6 ft.; and MM -8, 8 ft. Danforth Mfg.Co., Monmouth, Ill.-TECHNICIAN

S -R ANTENNA MOUNTSModel ST -18A is an assembled

adjustable wall bracket for sidemounting antennas, made of gal-vanized embossed steel. Two 18 -in.brackets have slotted tracks to per-mit horizontal adjustment of the

antenna mast for clearance of roofoverhang. Model ST -3-18A com-bination bracket includes a 3 -in.upper bracket which is set up di-rectly under the peak of the eave

St -3.18A

to provide additional support fortall masts. One 18 -in. adjustablelower bracket is similar to that usedin the ST -18A. South River MetalProducts Co., Inc., 377-379 Turn-pike, South River, N.J.-TECHNI-CIAN

Davis EXTRA -DIPOLE KITThe easy -to -install Third Dipole

Kit, to improve reception of themanufacturer's Super -Vision an-tenna, is now available. The Super -Vision is normally equipped with 2dipoles, which can be peaked forhigh or low channels by changingthe spacing between them. The extradipole provides increased gain, par-ticularly on Channels 4, 5, 6 and 7.

The kit contains the dipole, acces-sories and instructions. List price,$9.75. Davis Electronics, P. 0. Box1247, Burbank, Calif.-TECHNI-CIAN

C

eA


SPECTRUM

ToPs,erri a

The Fretaray Spectrum is the first UHF and VHFantenna with a shielded back that needs noassembly. It is guaranteed to withstand windsup to 100 miles per hour. It has the newestmethod of shielding signals from the rearcalled SPECTROMATIC REFLECTION SHIELDING.The reflector is effective shielding against allangles of polarization, vertical, horizontal and

angular.

Collapsible ... forEASIER HANDLING

RED YELLOW BLUE

All -channel performanceHigher front -to -back ratioLighter, better lookingMore easily installed and stackedHigher uniform gain over all channelsIdeal for primary, near fringe and fringe

areasHigher average gain than other broadband

antennasPermits the use of a single transmission

6"

3Y/"0 t

e INC. 406 N. CRAIG STREET, PITTSBURGH 26, A.REGISTRATION 584994 OTHER PATENTS PENDING

TUNG-SOL TUBE QUALITYPAYS OFF IN SALES !

Block and White Picture Tubes

Purpose Tubes

Radio and TV Receiving Tubes

Dial lamps

The performance quality of Tung -Sol Tubes will keepcustomers convinced that you're the best serviceman inthe business. Tung -Sol Tubes meet highest set manu-facturers' specs-protect you against call-backs Tellyour supplier you'd rather have Tung -Sol.

TUNG-SOL ELECTRIC INC., Newark 4, N. J.

Sales Offices:. Atlanta, Chicago, Columbus, Culver City (LosAngeles), Dallas, Denver, Detroit, Newark, Seattle

TUNG-SOL® ELECTRON TUBES

Outlook forBy ALBERT J. FORMAN

CONSULTING EDITOR, TECHNICIAN

The phenomenal growth of the electronic field hasmade the TV -radio technician a major factor in the na-tion's technological structure. The public has made TVand radio one of its prime sources for entertainment andinformation-and for good reason. For a relatively smallpro rata investment in a receiver, 500 per week for TV

$ MILLIONS20002.002200200010001400100.00MOOGOO -GOO.0O200

ESTIMATED VS BILL FOR RA010-TV SERVICINGMO. I AND INSTALLATION (SOURCE: RETNA).

1950 19 51 1952 1953 1954 155 1955

13Riplaesme0 Tulle-RiA 232 Pieta. 0Cortmmemants and Ateess 600 1:1Labar 111Total

941

and 50 per week for radio, over the life of the set, $1billion worth of entertainment is made available everyyear.

Consumers now own some 125 million radios, 30 mil-lion TV sets, 29 million phonographs, plus a significantnumber of recorders, public address systems and otherelectronic units. Inherently, these devices require agood amount of maintenance by skilled personnel.

Today about 60,000 major service technician outletsand dealer service departments provide the necessarymaintenance. The important role they play is indicatedin Chart I, compiled by the Radio -Electronic -TelevisionManufacturers Association (RETMA). Note that for1954, the bill for radio -TV servicing is close to $1.6 bil-lion. There is good reason to expect the bill for 1961 tocome close to or even surpass, the RETMA estimate ofover $2.6 billion.

Some perspective of the radio -TV technician's posi-tion in relation to that of other crafts may be obtainedby examining the following statistics from a compre-hensive study made by the U. S. Department of Labor.These figures are published in the recently issued Tech-nical Bulletin No. T-140, The Skilled Labor Force, andcover the years through 1950. Although present figuresare somewhat higher, those for 1950 are quite enlight-ening.

As shown in Chart II, the 78,300 radio and TV me-chanics are dwarfed by the carpenters and auto me-chanics, but are numerically greater than the railroad

515,400

CHART II

I I I I

6770500

431,100

324,00096000

24,000

NUMBER OF SKILLED WORKERS INSELECTED OCCUPATIONS (1950/SOURCE, DEPT. OF LAB0R,I954 REPORT

25.300 ,3,200 133,000000039.900 20- x .900 0000

CAN ENTERSPA STERS EL OBERS .010-TY UPPIOLST FRCP 00,ER- 9,190025OAECNAPACS RAKERS

°UTO ELECTRICIANS BAKERS RAILROAD 001100 PIANOMECHANICS MECHANICS °PIC TURE REPAIRMEN

MS


Techniciansmechanics and furriers. Not indicated on the chart is theimportant fact that the relatively infant electronic artis growing at a much faster rate than other fields, andthe demand for electronic technicians is rising pro-portionately.

Again using a selected number of occupations, themedian years of schooling of male craftsmen is plottedin Chart III. These Department of Labor statistics showthat radio and TV mechanics have the highest rating,12.2 years, which is equaled only by airplane mechanics.Despite this relatively long period of schooling, findingsindicate that the annual income of radio and TV me-chanics is considerably lower than other trades- some40% below airplane mechanics, and more than 15%under the earnings of the least educated group, thecarpenters.

Two primary needs related to the growth of the tech-nician present themselves: Training and public relations.

The growth of the civilian electronic market alonerequires more technicians than are presently available.When the potential need of military mobilization isadded, the demand is most imposing.

Not only do we need more TV -electronic technicians- we need better-trained ones to cope with the in-creasing complexity of equipment such as color TV. Agood deal of this advanced training is obtained by thestudy of technical articles published in trade periodi-cals. Individual manufacturers have contributed muchwith their service clinics.

2 22

04

1:1

CHART EL

00

MEDIAN YEARS OF SCHOOLING FORNALECRAFTSMEN IN SELECTED OCCUPATIONS 09501.SOURCE, DEPT OF LABOR 1954 REPORT.

9944 9.4

RADIO -Tv ELECTRICIANS MACHINISTS A r uRP RS I PLUMBERS RAILROAD

MECHANICSM CHANICS

AIRPLANE MOTION AUTO UPHOLSTERERS PAINTERS BA

MECHANICS PICTURE MECHANICSOPERATORS

Like it or not, the TV technician occupies a sensitiveposition in the community. Psychologically, he meetsthe public at the wrong time; of necessity, a time whenthe TV set that has become such an integral part of ourlives is not operating properly. The viewer is frustratedand annoyed. Furthermore, the technician must chargea reasonable fee commensurate with his effort, invest-ment in instruments, and skill.

The first step needed is the education of the public tothe fact that TV servicing fees are lower than those forother services, and that the TV medium makes availablea tremendous volume of entertainment at an insignifi-cant cost, compared to other media. Too little has beendone in this direction to date. TECHNICIAN's contribu-tion along these lines is its large display chart, "So Muchfor So Little." It clearly shows the public why the tech-nician merits appreciation rather than slander.

Self -policing is a must for the service industry if the"gyp" label (which only a rare few deserve) and gov-ernment regulation are to be avoided. Through variousservice associations, initial progress is being made inraising standards and elevating status; much, however,remains to be accomplished.

TUNG-SOL TECHNICAL DATAPAYS OFF IN SERVICE!

T-58 700 pages -600 tube types

NEW! 1954 Edition! T-70 160 pages of data on CR tubes,receiving and special tubes, dial lamps

T-31 300 blueprint bose diagrams for 1100 tube types

Here's the most practical set of tube reference books inthe industry-all the information you need for everydayjobs! They're easy to read-easy to use (always lie flatwhen open.) You'll get work done faster with Tung -SolTechnical Data Books. Ask your tube supplier aboutthem.

TUNG-SOL makes All -Glass Sealed Beam Lamps.Miniature Lamps, Signal Flashers, Picture Tubes,Radio, TV and Special Purpose Electron Tubes andSemiconductor Products.

TUNG-SOL® TECHNICAL DATA


More Antennas & AccessoriesVHF, Auto Types; Mounts, Towers, Lightning Arrester

JFD VHF YAGI-CONICALSThe use of half -wave stacking is

said to improve gain by more than2 db in this yagi-conical SuperPower Jet, model Jet213S-5. List

price, $39.95. Conversion kit forhalf -wave stacking of existing yagi-conicals, $4.00 list. JFD Mfg. Co.,6101 16 Avenue, Brooklyn 4, N.Y.-TECHNICIAN

Radelco ANTENNASThe Topper broad -band yagi,

model RM-213, is intended for areaswhere stations are not located in thesame direction. This separately ori-enting yagi performs on all VHFchannels. Pre -assembled for easy in-stallation. Also available as separatearrays: Model RS -206, low bandyagi array; model RS -713 high bandyagi array.

Model US -152, a UHF dual cor-ner reflector with all -metal insula-tors, is said to work equally well inboth wet or dry weather. Discrimi-nates against unwanted, verticallypolarized signal. Radelco Mfg. Co.,Cleveland 25, Ohio.-TECHNICIAN

Amphenol L'TN'G ARRESTERFor use on UHF as well as VHF,

arrester 114-328 gives protection onboth frequency bands with lowmeasurable loss in signal strength.It is universal in that it handles flat,tubular or open -wire transmissionlines with equal facility. Installationis quick and simple, as all lead-insare inserted in a vertical position.American Phenolic Corp., Chicago50, Ill.-TECHNICIAN

Alpar EXTENSION TOWERSLightweight Crank -up towers are

triangular in base shape. Aluminumtubing is used for upright, cross anddiagonal members. New Alpar de-sign automatically locks individualsections into position as they reach

correct level. A cord -actuated re-lease trips the lock on a key sectionafter which entire tower may belowered. This system avoids thepossibility of uncontrolled telescop-ing during raising or lowering. Tow-ers consist of four 24 -ft. telescopingsections, may be raised to a heightof 95 ft. Weight is less than 100 lbs.Other sizes available. Alpar Mfg.Corp., 2910 Spring St., RedwoodCity, Calif.-TECHNICIAN

C -P ANTENNA MOUNTSDesigned for masts up to 13A -in.

in diameter, 3 wall brackets willhold masts 21/2, 4 and 7 -in. awayfrom the wall, respectively. A ventpipe mount fits any size vent pipeand holds masts up to 11/2 -in. indiameter. All units are zinc -plated,heavy -gauge steel. CommercialProducts, 417 Main St., Toledo,Ohio.-TECHNICIAN

Snyder DUAL AUTO ANTENNADual mounting on the rear deck

of the car permits unobstructeddriving vision, better reception be-cause antennas are away from theignition system, and mounting on

accessible locations. The Dual RearDeck auto antenna kits come in 2types, a Swivel type and a Ball -and -Socket type. The former in-cludes models RD -8 and RD -8B,with matched impedance Hi -Qtransformer (booster); the Ball -and -Socket type includes the RD -9and the RD -9B (with booster). Allkits include 2 antenna staffs, cableand mounting hardware. Dick Mor-ris, Snyder Mfg. Co., Philadelphia40, Pa.-TECHNICIAN

Clear Beam VHF ANTENNAThe Tri-King is available in 2

models, the TK1500 and the TK1800,with half -wave spacing, for fringearea reception. The antenna corn-

bines the Tri-King dipole assemblywith a quick -rig reflector screen.Clear Beam Antenna Corp., 100Prospect Ave., Burbank, Calif.-TECHNICIAN


Parts Show New Prods. (cont.)

NEW WALL FEED -THROUGH TUBE forbringing antenna lead-in inside housefeatures, in addition to wall socket forconnecting wire to set, a built-in light-ning arrestor on the end of the tube thatis outside the house. Made by TelevisionHardware Mfg. Co., Rockford, Ill., Div.of General Cement Co. . . . A SOLDER

DISPENSER accommodates all standardspools, works something like a scotch -tape dispenser. Desired length of solderis reeled off and severed by the unit'scutting edge. Replaceable steel filebrush is built in to keep solder tipsclean. 2 compartments permit storage ofextra tips for guns and irons. RytelElectronics Mfg. Co., 9820 Irwin Ave.,Inglewood, Calif.

HI-FI MAGNETIC CARTRIDGE, RECOTON500, uses 2 styli, for standard and fine -groove records, in a turnover arrange-ment similar to that employed on ordi-nary crystal pickups. Response is saidto extend from 20 to 16,000 cps. Made tofit standard tone arms, the unit is fea-tured by Recoton Corp., 147 W. 22 St.,New York 11, N. Y. . . . HUDSON LINE

OF SMALL SPEAKERS, intended for limited -space applications, features units from 2to 5 in. in diameter, plus one ovalspeaker. Oxford Electric Corp., 3911South Michigan Ave., Chicago 15, Ill., isputting out the low-priced line.

UNIVERSITY COMPANION, a novel item,incorporates a compact 2 -speaker sys-tem (8 -in. Diffusicone woofer, 4401horn tweeter) plus a pre-set clock, in-tegrated in the center of the unit, forturning sound system (or other ap-pliances) on and off. Entire system is 2ft. wide, 10 in. high, may be placed onshelf, on other furniture or mounted onwrought iron legs. Balance control fortweeter is included. The maker, Uni-versity Loudspeakers, Inc., 80 So.Kensico Ave., White Plains, N. Y., alsointroduced a line of 8-, 12-, and 15 -in.Hi-Fi triaxial reproducers.

10 -SET ANTENNA DISTRIBUTION SYSTEMselling for $89.50 list, the Ten-Tenna, isnew item of Waldom Electronics, Inc.,4625 W. 53 St., Chicago 32, Ill. The dis-tribution amplifier makes available allVHF channels, can also accommodateone UHF program. From a single an-tenna, it provides 300 -ohm output for 1to 10 sets . . . JERROLD ELECTRONICS

CORP., 26th & Dickinson Sts., Philadel-phia 46, Penna., maker of master an-tenna systems, enters the home -installa-tion field with an individual -consumerline of De-Snower antenna preampli-fiers. The units operate from remote 24 -volt source, are antenna mounted, haveflat response for use with color receiversand provide gain of 25 db.

CALIBRATED TUNABLE INDOOR ANTENNApermits individual optimum impedancematch to each channel. Adjustmentpoints of tuning knob may be easily re-set by referring to calibration numbers.The Spico Super 6, incorporating thisfeature, is made by Spirling ProductsCo., Inc., P. 0. Box 411, Hicksville, N. Y.

"ONE

Nal 1.11-11 IS

LIKEUSEFUL

Of

OTHER CARTRIDGES"

Astatic Universal ModelL -I2 -U Crystal Cartridge -

output is low (1.2 volts) withremovable condenser harness ON;

it's high (4.0 volts) with harness OFF.

THE ASIATIC MODEL L -12-UCRYSTAL CARTRIDGE

Astatic's dual -output, universal type crystalcartridge-the Model L-12-U-is a truly superiorreplacement in the great majority of 78 RPMinstallations encountered by servicemen today.No other cartridge is capable of broader applica-tion . . . yet, the Astatic L -12-U is guaranteed toprovide performance equal to, or exceeding, thequality of the originals. It isn't a cure-all. But itis the closest thing to it that has so far been de-vised by electronic engineers. It is your bestanswer for simplification of inventory, for avoid-ing lost time and many problems of servicing.You'll be glad you got acquainted with the "hand-iest of all crystal cartridges," Astatic's L -12-U.

EXPORT REPRESENTATIVE401 Broadway, New York, N.Y.

Cable: Astatic, New York. CORPORATIONCONNEAUT, OHIO

IN CANADA: CANADIAN ASTATICLIMITED, TORONTO, ONT.


Shop EquipmentTest Instruments, Other Aids to Servicing

Sylvania TV CARRIERThe Classy Chassis TV carrier is

said to take the pain out of trans-ferring TV sets from home to truckon service calls. Made of light-weight aluminum with ball -bearing

rubber wheels. Reported to be eas-ier to grip, carry or wheel up anddown steps; to wheel through doorsand entrances and on sidewalks.Available to Sylvania distributorsand dealers as part of order or salesdeals. Sylvania Electric Products,Inc., 1740 Broadway, New York 19,N.Y.-TECHNICIAN

Winston COLOR GENERATORModel 150 Rainbow Generator, a

color TV pattern generator, pro-duces from one to eight rainbows onthe face of a color TV crt. Individualcolors making up the rainbow maybe identified for use in testing andalignment. This instrument can serveboth as a color demonstrator for thesales department and a servicingtool for color TV alignment andtroubleshooting. Provides modulatedr -f output on channels 2 to 6, orchroma signal output at the sameoutput terminals. Controls includechannel tuning and rainbow colorselector. Winston Electronics, Inc.,4312 Main St., Philadelphia, Penna.-TECHNICIAN

Superex CONTACT CLEANERTuneraser contains a chemically

treated material formed as an eraserfor easy handling, is designed forremoving tarnish and corrosion fromturret contacts or other electricalcontacts. It is applied by rubbing ina rotary motion on the contact orsurface to be cleaned, without dan-ger of abrasion. Net price, 98e. Su-perex Electronics Corp., 23 AthertonSt., Yonkers, N.Y.-TECHNICIAN

RCP COMBINATION TESTERModel 657 Do -Ail combines a ca-

pacitance meter, low- and hi -rangeohmmeter, vtvm, peak -to -peak volt-meter, and may also be used as aninductance meter by reference to ameasurement chart. Capacitancemeasurement range is from 1 mmfdto 1,000 mfd. Low ohmmeter rangehas 10 ohms at center scale, withhighest range going to 10,000 meg.Voltages (ac and dc-rms) are di-rect -reading to 6,000 v. Zero centervoltage setting. Handle serves as in-clined rest. Pilot bulbs on selectorswitches illuminate switch position.Radio City Products Co., Inc.,Easton, Penna.-TECHNICIAN

EMC OSCILLOSCOPESome features of model 600 oscil-

loscope are: 5UP1 5 -in. scope tubefor sharp focusing and good inten-sity; retrace blanking amplifier; 2 -step compensated attenuator inputand 2 -stage push-pull vertical am-plifier with sensitivity of 0.02 v perin. Synchronization is also availableon either positive or negative phaseof input voltage. Price, $99.50. Elec-tronics Measurements Corp., 280Lafayette St., New York 12, N. Y.-TECHNICIAN

Scranton SECTIONAL LADDERDesigned for the TV service tech-

nician, this 40 -ft. aluminum sec-tional ladder may be raised or low-ered by one man, according to the

manufacturer. Ladder breaks downinto 5 8 -ft. sections, is 151/2 in.wide, and stores in small space 11in. high. Scranton Aluminum Mfg.Co., 419 S. Wyoming Ave., Scranton,Penna.-TECHNICIAN

Miller CHASSIS CRADLELight aluminum construction,

friction "L" clamps, adjustabilityto accommodate different chassisshapes and sizes and an integral

turntable are features of this tech-nician's chassis service turntable.Sold on 10 -day money -back guar-antee. $19.95. Ken Miller Sales, 627E. Maumee St., Adrian, Mich.-TECHNICIAN

ASD TV TUBE TESTERThe TV tube tester is an im-

proved version of the TV -20 (Feb-ruary TECHNICIAN). The new unithas listings of all recently announcedcolor TV tubes, increased sensitivityto internal leakage and gas, and arugged leatherette case. Can test anentire set of tubes in a few minutes.Has no roll chart, practically no set-up. Includes a positive gas detec-tion circuit, dynamic conductancecheck, and automatic line compen-sation. American Scientific Develop-ment Co., P. 0. Box 104, Fort At-kinson, Wisc.-TECHNICIAN

Hickok NOISE GENERATORThe manufacturer states that

model 755 is the first noise genera-tor completely self-contained withno additional equipment required. Itindicates the amount of noise in-herent in receivers to permit cor-rection of this defect. Unit contains2 indicating meters, is divided intoa vtvm section and a generatornoise section. Meter readings to 5vin 4 scales, zero center feature,vtvm is regulated. Frequency re-sponse is flat from 10 mc to 250 mc.Hickok Electrical Instr. Co., 10514Dupont Ave., Cleveland 8, Ohio.-TECHNICIAN


1M

Make Most of Test Equip.

(Continued from page 19)

ings checked correct resistance, andthe output from each half of the sec-ondary was the same. Quite sometime elapsed before I realized thatthe polarity of each half of the wind-ing was the SAME instead of op-posite. Somebody at the factory hadcrossed over the leads, and insteadof being in opposing phase, the twowindings were in series. And the sethad left the factory and passed in-spection this way!

When separate"windings are pres-ent for feeding the grids of push-pull output stages in hi-fi amplifiers,this trick can be used for quicklychecking for proper phasing, ifmarkings present are poor or miss-ing. Many other applications of thetest could be cited.

Fig. 2 shows the schematic for aprobe and cable used for low -fre-quency work around the shop. Atlow, frequencies, the attenuation isrelatively low, being determinedmainly by the size of the couplingcapacitor, which is 0.05 or 0.1 mfd.At higher frequencies, the combina-tion of the 10k resistor and the scopeprobe wiring and cable capacitanceeffectively form a filter that causesa rapid attenuation, the attenuationbecoming progressively greater asthe frequency rises.

Fig. 3 indicates the response of thescope with and without the probeadded to it. The lightly -shadedcurve shows the response of a scopewith an inadequate high -frequencycharacteristic, when a sweep genera-tor is connected directly to it. Themore heavily shaded curve showsthe response of the same scope withthe probe and cable of Fig. 2 at-tached between the sweep generatorand the scope input. The rapid fall-ing off of the output at the higherfrequencies is due to, the cable's ca-pacitance. Note how rapidly the re-sponse drops off at about 0.15 mc.

This probe should not be used forchecking in r -f or i-f circuits, unlessthe attenuation it introduces is al-ways kept in mind, and results areinterpreted accordingly. The re-sponse curves show the importanceof using a scope cable with as low acapacitance as possible; it might bewell for each technician to feed theoutput of a good sweep generatorinto his scope with and without thecable and probe attached, so thatthe relative response between 30cycles and 4 mc can be determined,to be kept in mind subsequently.

In this day and age with almost everyone

shouting that his product is best, we would

like to say . . . quietly and confidently . . .

just try

AEROVON

CAPIKIT0115

THE NEW MODEL TV -11

Uses the new self-cleaning Lever ActionSwitches for individual element testing. Becauseall elements are numbered according to pin numberin the RMA base numbering system, the user caninstantly identify which element is under test.

Tubes having tapped filaments and tubes withfilaments terminating in more than one pin aretruly tested with the Model TV -11 as any of thepins may be placed in the neutral position whennecessary. Uses no combination type sockets.Instead individual sockets are used for each typeof tube. Thus it is impossible to damage a tube by

inserting it in the wrong socket. Free -moving,built-in roll chart provides complete data for alltubes. Phono jack on front panel for pluggingin either phones or external amplifier detectsmicrophonic tubes or noise due to faulty elementsand loose external connections.EXTRA SERVICE-The Model TV -11 may be used as

an extremely sensitive Condenser Leakage Checker. A

plete with portable sever L50 will detect leakages even when the frequency Is oneOperates on 105-130 Volt 60 relaxation type oscillator incorporated in this model

A.G. Hand rubbed oak cabinet eow-effper minute.

SHIPPED ON APPROVALNO MONEY WITH ORDER -NO C O. D.

Try it for 10 days before you buy.If completely satisfied send $11.50and pay balance at rate of $6.00 permonth for 6 months.-No Interest

or Carrying Charges Added. If not

completely satisfied, return to us.

no explanation necessary.

1

rMOSS ELECTRONIC DISTRIBUTING CO., INC.Dept. D-47, 3849 Tenth Ave., New York 34, N. Y. IPlease rush one Model TV -11. I wee to pay $11.50 within 10 dap Iafter receipt and $6.00 per month thereafter.NAME

ADDRESS

CITY ZONE STATE


TV -Electronic TechnicianReplacement Parts; Items for Sales and Service

Master COIN -TIMER DEVICEThe "Entiser" is an automatic

coin -meter mechanism with a built-in timer. Designed for coin opera-tion of TV sets, it is said to be easi-ly adaptable to other devices suchas juke boxes, radios, air condition-ers, etc. The Entiser attracts atten-tion to itself by automatically turn-ing on the TV set or other devicefor 4 free minutes every half hour,and by lighting up a sign. Insertionof a coin operates it for half an hour.Operation cycle may be presetduring installation. Further detailsfrom Felleisen Associates, 5839 W.Montrose Ave., Chicago 34, Ill., rep-resenting Master Electronics, Lib-ertyville, Ill.-TECHNICIAN

C -D MIDGET CAPACITORSThe Super-Micadon encapsulated

capacitors occupy about '3 the spaceformerly required for the same ca-pacitance, but life expectancy hasbeen increased. Moisture resistanceis said to be nearly 20 times that of

conventional types. Super Micadonsare designed with flat, clinched -wireleads for improved voltage break-down safety and reduction of overallinductance. Available in values from5 mmfd to 0.02 mfd. Cornell-Dubi-lier Electric Corp., South Plainfield,N.J.-TECHNICIAN

B -T UHF CONVERTERModel 99 provides the following

features: 300 -ohm match at inputand output, reduction of spuriousresponses, radiation suppression,single -knob tuning, converted out-put on Channel 4, 5 or 6, and drift-compensation of the oscillator. Listprice, $19.95; dealer net, $14.97.Blonder -Tongue Labs., Inc., 526North Ave., Westfield, N.J.-TECH-NICIAN

GI UHF -VHF TUNERThe Model 80 combination VHF-

UHF tuner is composed of a 13-position turret -type VHF tuner(Model 78) and a compact, continu-ously -tuned UHF unit (Model 79).The VHF section can be purchasedand installed separately; the UHFsection can be added in the field atlow cost. Features include a tri-concentric shaft arrangement. In the13th VHF position, the mechanismis switched internally to UHF. The70 UHF stations are evenly spaced,eliminating "bunching." General In-strument Corp., 829 Newark Ave.,Elizabeth 3, N. J.-TECHNICIAN

Scotch ELECTRICAL TAPEScotch brand 33 "Three -Eighths,"

wide, combines convenientsize with good insulation and hold-ing properties. Thin 7 -mil backingand narrow width provide conform-ability permitting tight, neat -ap-pearing splice wraps. Recommendedfor protecting connections frommoisture, corrosion and abrasion.High dielectric strength (10,000 v)and resistance to water, oils, acids,alkalies, sunlight and weather. Min-nesota Mining & Mfg. Co., 900 Fau-quier St., St. Paul 6, Minn.-TECHNICIAN

Alpha SOLDERS, WIRESSeven fluxes and 6 types of bar

solder especially designed for useon printed circuits and chassis ofvarious types are available. Thefluxes include activated and non-activated types, also quick -dryingand minimum evaporation types.The bar solders include 2 tin -leadalloys and 3 silver -bearing alloys.The manufacturer will advise onspecific applications for the varioustypes.

The Service Spool wire assort-ment is a standardized small -quan-tity selection of wires used in gen-eral electronic work, designed toprovide a complete inventory in asingle package. The assortmentconsists of 5 basic types-hook-up,test -lead, dial -cable, phono andtinned copper (bus bar) wires-with variety within each type. Al-pha Wire Corp., 430 Broadway, NewYork, N.Y.-TECHNICIAN

IE STANDOFFSLine-Lok standoffs feature cam -

type separator which keeps the in-sert firm against the stem; inter-locking side -lips to prevent splittingand maintain constant pressure; andopen-end drains that act as an outletfor dust and moisture. Of the hinge -type design, the Line-Lok clicksopen, snaps shut, is adaptable forholding most UHF and VHF lines.Polyethylene insert results in low -loss performance. iE Mfg., 325 N.Hoyne Ave., Chicago 12, Ill.-TECHNICIAN

Corson CAPACITORSGlass tubular plastic dielectric ca-

pacitors, type G-6 Glascaps, featurelight weight and compactness, andare particularly useful in high -volt-

age dc, and low frequency -low volt-age ac applications. Glascaps areavailable in a range of ratings from0.01 mfd at 600 v through 0.0015 mfdat 60,000 v. Corson Electric Mfg.Corp., 540 39 St., Union City, N.J.-TECHNICIAN

Illinois ELECTROLYTICSMiniature and sub -miniature elec-

trolytic capacitors, designated astypes MT and SMT, are low cur-rent drain capacitors especially de-signed for use with transistors,printed circuits and other applica-tions where small size and lightweight are required. Features in-clude all aluminum construction withconnecting leads of tinned brass forextra strength. They are hermetic-ally sealed and range in value from1/2 to 100 mfd, 3 to 75 wvdc. Lengthsrange from 1/2 to 11/4 in. Illinois Con-denser Co., 1616 N. Throop St., Chi-cago 22, Ill.-TECHNICIAN


Techadwif40tetti4

with Sol Heller

TUNING IN THE TOOTH. Lady whohad just had some dental work donedropped in to see her radio serviceman.It turned out that two fillings made ofdissimilar metals were functioning asa detector, causing the woman to re-ceive radio stations through her teeth.

The radio man was sympathetic."Gee, that's tough," he said. "But

why come to me? I can't help you. Whydon't you go back to your dentist andhave him do something about the fill-ings?"

"You don't understand," replied thewoman. "I wasn't asking you how toeliminate the condition; I merelywanted to find out if you had a smallbuilt-in aerial I could put in my hair,to improve reception."

HOW TO AVOID A SERVICE CALL.It'll take this department a long time toforget the gentleman from Rochester,N. Y., who visited his favorite broadcaststation and requested that the actorsspeak louder, because his set's volumewas kinda low.

TRADE SCHOOL STORY. Lady whoshould have known better put her soninto a radio trade school. The boy washopelessly out of his element, did nohomework, misbehaved, and acquiredless knowledge of Ohm's law than anelectron. One day the boy's mothercame to visit his teacher. She heard theunfavorable report on his progress insilence. When it was finished, she saidwith a wan smile:

"Tell me, can't you say one good thingabout Johnnie?"

The teacher thought a long time."Well," he said at last, "Johnny doesn'tset off fire crackers in class."

FAMOUS LAST WORDS. A scientistcalled on a TV serviceman one Sundaymorning for emergency service on a2,000 -tube electronic brain he was usingin his lab. "I don't think there's muchwrong with it," the scientist remarked."Only a loose wire, probably."

DEPARTMENT OF VECTOR ANAL-YSIS. Technician whose wife gave birthto a boy and a girl conveyed the infoto a friend as follows:

"It was twins, 180 degrees out ofphase."

HEAR, HEAR. A nervous technicianwho was asked to address an associa-tion meeting took courage from thefriendly faces of the men and womenlooking up at him and said (beforebiting his tongue an instant later), "Myfriends-I will not address you as la-dies and gentlemen, because I knowyou all too well."

KESTER

KESTER SOLDER COMPANY4264 Wrightwood Avenue Chicago 39, Illinois

Newark 5, New Jersey Brantford, Canada

Since the most importantsingle step in Radio -Television Servicing issoldering ... it's just plaingood sense to use the best-KESTER SOLDER ...Key Name in Solderfor More Than 50 Years.

"'DERERIE SWITCHES

are sold exclusivelythrough distributors

RuggedConstruction

Sealed inPlastic Bag

Silver PlatedContacts

MinimumSize

All ERIE Switches have heavily silver plated contactsand high grade phenolic insulators. They meet ex-isting RETMA requirements. The ERIE line consistsof 25 items, including shorting and non -shortingtypes for a wide field of applications in radio, TV,intercommunication, and other electronic equipment.

ERIE Switches are protected in sealed poly-ethylene bags and individual boxes for preservationand convenient stocking. Each package containsknob and mounting accessories.

IndividuallyPackaged

Four Ty es

General Purpose

Single Section Multi -Section Lever Action

ERIE components are stocked by leading electronic distributors everywhere.

ELECTRONICS DISTRIBUTOR DIVISION

ERIE RESISTOR CORPORATIONMorn Offices ERIE, PA.

Factories ERIE, PA. LONDON, ENGLAND TRENTON, ONTARIO


Looking for More Help?


unexplained lengthy lapses in em-ployment. If a man has jumpedaround a great deal, it's more likelythan not that there's somethingwrong with his personality, temper-ament or ability. Keep in mind thatfrequent switches are sometimes duesolely to a man's justified attemptsto find a job that's "just right."

3. Do your best to "size up" theapplicant as a man. Ask yourselfthese questions: (A) Do I think hewill turn out to be a hard, efficientworker? (B) Do I consider him tobe an honest, sincere person? (Besure to check this latter point withprevious employers.) (C) Does itseem likely that this man won't"mix" well with any other em-ployees? For instance, does he haveany obviously obnoxious or unpleas-ant mannerisms which wouldn't sitwell with associates, and equallyimportant, with customers in thehome?

If the man is to make outside calls,consider his appearance. It's mostimportant that an employer feels en-tirely satisfied that his outside menare neat, personable, and acceptablerepresentatives of the firm.

Now, another thing regarding thehiring of experienced men. Manyshop owners feel that a trial employ-ment period-say three weeks-isdesirable; a clear understanding ex-ists that if either side isn't one hun-

Don't assume that any experienced man is theone for you. Check on him first to be sure.

Don't turn thumbs down automatically on theambitious youngster with meager experience,who's trying to get his foot in the door.

dred percent satisfied at the end ofthis time, the deal can be called off.In fairness to the new man, makesure that you review his situationat the end of the agreed -upon time,and give him a report.

It goes without saying that in hir-ing "green" men, a similar check-upshould be made, to determinewhether the man is an apt candidatefor the job.

Now and then dealers have madesome real "finds" in youngsterswho've been pounding on numerousand divers shop doors, for a chanceto break into the "magical" TV -radiofield.

In looking over likely "green"candidates, it's wise to cast asideprejudices regarding acceptable ex-perience.

Too many shop owners, for in-stance, scoff at electronic work inthe armed forces, etc. Now, such ex-perience may not equip the individ-ual for immediate bench work; it is,however, an asset.

Enthusiasm Is an Asset

"I'm not running a school, Bub,"is what a great many young hope-fuls hear every day, as doors slamin their faces. Many of these young-sters are ambitious, though, and de-termined to get their foot in thedoor; their very enthusiasm makesthem valuable timber.

A good many dealers have morework than they can handle thesedays. As a result, they are late inanswering calls, and frequently losecustomers (and good -will) over de-lays in servicing sets. Many shopscould probably increase their servicevolume, if they had enough help.

To sum up: A thorough examina-tion of the personnel situation is in

order. Experienced men are avail-able to a greater extent nowadays.Some of the inexperienced ones canbe trained quickly if given a breakin the shop-meaning if they aregiven the opportunity to get theirhands on equipment, as well as onbrooms and dust rags.

Consider the possibility of expand-ing your force through adding goodmen, and getting after more busi-ness. Running a few "help wanted"ads will get results in most localities.And here's a tip: If you want tobreak in some learners, make surethat your ad for a TV or radio serv-iceman clearly specifies that only aminimum of experience is required.

In the service end of our business,there is entirely too much hiringbeing done on a sketchy basis. Thisis why the turnover of techniciansis so great, and this is also one ofthe reasons why shop owners andservice department managers con-sume large quantities of aspirin.

So take time to select your men,and try to weigh the potential valueof those who are light on experience,but heavy in the direction of futurecan -do.

Improper Tinting


supplied to the blue gun, while -Qsignal is used nowhere else, thetrouble is most likely to lie in the-Q channel.

The foregoing analysis is intendedto illustrate how a thorough knowl-edge of the components making upeach color can be very helpful inpin -pointing trouble. It is possible,particularly when there is reason tobelieve that the various adjustmentshave not been tampered with andare correct, to find the defective sec-tion simply by a careful analysis ofthe incorrect colors seen on the crtscreen.


SERVICE ASS'N REPORTS

ETSC: Report & By -LawsThe Eastern Television Service

Conference, 211 Market St., Pater-son, N.J. has recently issued a fullreport on the proceedings of its 2ndannual meetings in Philadelphiaduring April. In addition to minutes

ETSC officers (left to right): John G. Rader(Treas.), Reading, Penna.; Harold B. Rhodes(Chairman), Paterson, N. J.; Bert A. Bregenzer(Vice Chairman), Pittsburgh, Penna.; andFerdinand J. Lynn (Secretary), Buffalo, N. Y.

of the sessions, the 26 -page reportincludes copies of the constitutionand by-laws, reports by special com-mittees on public relations, manu-facturers, factory service and dis-tributors, and a directory of ETSCofficers.

IRTSA Elects OfficersThe Indianhead Radio -TV Serv-

icemen's Association reports throughits secretary, C. W. Stiemke, 602 Wa-ter St., Eau Claire, Wisc., that itelected new officers at its recent an-nual election and banquet. Newline-up consists of Vernon Town-send, president (Menomonee), EarlKratch, vice-president (Bloomer),Upton St. Clair, treasurer (Bloomer)and C. W. Stiemke, secretary. Themeeting was held in Chippewa Falls.

IRTSA likes its blow-up copy ofSo Much for So Little, is alsopleased with TECHNICIAN.

PRSMA on Unpaid BillsAn article in the monthly organ of

the Philadelphia Radio ServiceMen's Association, 1307 W. Rockland

St., tackles the problem of customerrefusal to pay bills when sets aredelivered. According to Pennsyl-vania law, an artisan (the techni-cian, in this case) may retain pos-session of personal property onwhich he has performed repairs un-til he has been paid.

In most parts of the country, theserviceman may not legally do this;the law leaves him pretty much outin the cold in dealing with welchers.Getting equitable legal protectionfor technicians is a matter that re-quires organized pressure. Haveother associations attempted to ap-proach this and other legal prob-lems? TECHNICIAN would like tohear from those that have.

CRTSA Public Rel. ProgramA 13 -week TV series now in

preparation will be co -sponsored bythe Council of Radio and TelevisionService Associations, 1300 N. ThirdSt., Philadelphia, Penna. CRTSA isworking with co -sponsoring partsmanufacturers in preparing and fi-nancing these 15 -minute shows.Dave Krantz, chairman of the Coun-cil's Public Relations Committee,says the TV series is being designedto promote "public acceptance of theservice industry as a profession andit will also answer the many . . .

problems and questions that theset owner is . . . confronted with,due to misunderstanding concerningthe product he purchased."

TSE Purchase PlanParts jobbers, admitted as "asso-

ciated members" to the TelevisionService Engineers, 307 ShukertBldg., Kansas City, Mo., will be get-ting all the business of TSE mem-bers, if this organization's officershave any say in the matter. The planis to establish cooperation and mu-tuality of interest between purchas-ing technicians and dealers, on theone hand, and distributors, on theother.

WILL YOU HELP US?

. . . By giving us thename of the technicalassociation to which

you belong? We'd likethis information as partof an editorial surveywhich we're conducting.

Service Association:

Address

Manager or RecordingSecretary's Name:

Phone:

Your Name:

You Address:

Mail to: Associations Editor, TECHNICIAN,480 Lexington Avenue, N.Y.C. 17, N.Y.

Make servicing easier!-with the

K.M.S. RADIO, PHONOand TV CRADLE

NOW

only

$19.95

10 day money back guarantee

Introducing the new K.M.S. RADIO, PHONOAND TV CRADLE, never before equalled withits rigid, adjustable aluminum construction. Itsfeatures:

adjustable to any size chassis turntable permits turning chassis without

lifting friction "L" clamps adjustable for over

and under servicing portable aluminum construction small enough to fit on service bench

where instrument leads will reach25% deposit with order-balance C.O.D.Shipped f.o.b. Adrian, Michigan

KEN MILLER SALES627 E. Maumee Street

Adrian, MichiganPhone 1475

Coming . . . in September

TV and ANTENNA

"SPECS"Do YOU know

prices of latest model antennas?

the high voltages on different picturetubes?

the frequency coverage of antennas?

the sound and video I -F's in the newsets?

v other details about latest model TVreceivers and antennas?

The answers to these and many other ques-tions will be given in the exclusive SPECI-FICATION CHART in the outstanding Sep-tember issue of TECHNICIAN and CircuitDigests.

RESERVE ADVERTISING SPACE NOW!

Caldwell -Clements, Inc.480 Lexington Ave., New York 17, N.Y.

Telephone: Plaza 9-7880

TECHNICIANz. Circuit Digests


MFRS' Catalogs &

Bulletins

IRC DIODE DATA: Comprehensive data ontype 1N series germanium diodes, in-cluding construction, dimensions, andinterchangeability with standard types,is contained in Bulletin N-1. Interna-tional Resistance Co., 401 N. Broad St.,Philadelphia 8, Penna.

UTC TRANSFORMER GUIDE: Catalog A cov-ers transformers, reactors and filters;contains engineering specs and designdata. United Transformer Co., 150 Var-ick St., New York 13, N. Y.

TRIAD HI -Fl BROCHURE: Four new ampli-fier kits for high -quality sound systems,ranging from 10 to 40 watts, are de-scribed in Catalog TR-54, availablefrom Triad Transformer Corp., 4055Redwood Ave., Venice, Calif.

TACO ANTENNA MANUAL: Arranged toinclude only those antennas and acces-sories designed for the area served bythe distributor and his dealers. Sheetsare in binder -type cover. Availablethrough local Taco distributors.

ATR VIBRATOR CATALOG: 67 -page manualcontains interchangeability chart forcomplete line of vibrators, in additionto servicing procedure on auto -radio vi-brators and specifications. AmericanTelevision & Radio Co., 300 E. 4th St.,St. Paul 1, Minn.

RRCO TRANSISTOR MANUAL: An 8 -pagecatalog, fully illustrated with charts,voltage curves and diagrams, describesapplications for germanium diodes andPNP junction transistors. Radio Recep-tor Co., Inc., Sales Dept., 251 W. 19thSt., N. Y. 11.

RMS ANTENNA SUPPLEMENT: Supplemen-tary issue to the annual RMS catalog,Catalog 55-S describes the latest an-tennas and accessories with list prices,weights and packaging information.Write to Mr. Clifford Shearer, Directorof Advertising, RMS, 2016 BronxdaleRd., New York 62, N. Y.

PERMO CARTRIDGE REFERENCE: A cross-reference guide, based on the cartridgemanufacturer's needle part number, isa feature of Catalog 104, released byPermo Inc., 6415 N. Ravenswood Ave.,Chicago 26, Ill.

RECOTON GUIDE: The new 1954-55 Simpli-fied Reference Guide, for the servicedealer, contains information on replace-ment needles, and a manufacturer's crossindex. Write Recoton Corp., 147 W. 22ndSt., New York 11, N.Y.

LAFAYETTE CATALOG SUPPLEMENT: Re-placement parts, test instruments andHi-Fi equipment are described in a 67-page catalog, No. 5-54, from LafayetteRadio, 100F Sixth Ave., New York 13,N. Y.

TRU-OHM RESISTOR CATALOG: 1954 versionof annual release contains 20 pages ofphotos, charts and technical data on themanufacturer's full line of resistors andpower rheostats. Available from Tru-Ohm Products, 2800 N. MilwaukeeAve., Chicago 18, Ill.

TELEX HEADPHONE BROCHURE: The Dyna-set, an under -the -chin dynamic head-phone, is described in a catalog sheetavailable upon request from Dept. KP,Telex, Inc., Telex Park, St. Paul 1,Minn.

EFCON CAPACITOR DATA: Specifications,dimensions, test data and other infor-mation on the new Type MH herme-tically -sealed, tubular capacitors is con-tained in Technical Bulletin 154. WriteDept. F. Electronic Fabricators Inc., 682Broadway, New York 12, N. Y.

IRC HF RESISTOR BULLETIN: Type HFRhigh -frequency miniature resistors, de-signed for use in circuits requiring flatfrequency response over a wide band,are described in Catalog Data BulletinF-3 released by International Resist-ance Co., 401 N. Broad St., Philadelphia8, Pa.

THOMAS CRT GUIDE: Picture tubes from10 -in. to 27 -in, in size are arranged ingroups of similar types. Number codereadily identifies directly interchange-able types. Electrical and physical char-acteristics are tabulated in the pocket-size Thomas Phototron Picture Tube Re-Placement Guide. Thomas ElectronicsInc., 118 Ninth St., Passaic, N. J.

CHANNEL MASTER ANTENNA MANUAL:More than 125 items, including VHFand UHF antennas, masting, towers,mounts, inter -action filters and generalaccessories, are covered in an illustrated18 -page, large -sheet brochure, punchedfor loose-leaf mounting. Channel Mas-ter Corp., Ellenville, N. Y.

MALLORY COMPONENTS HANDBOOK: Allof the manufacturer's electrical andelectronic components, including bat-teries, capacitors, controls, resistors,rectifiers stacks, switches, vibrators,power supplies, TV components and testequipment, are listed, described and in-dexed in 61 pp. Catalog 554, P. R. Mal-lory & Co., Inc., Indianapolis 6, Ind.

Industry Keyhole

COOPERATIVE BUYING is beingseriously considered by the NationalElectronic Distributors Ass'n. A com-mittee is now evaluating a buying pro-gram. Parts manufacturers have alreadybegun to attack the proposal, claimingthat such a plan will destroy the sys-tem of brand -name reliability and in-centive to manufacturers to improvequality . . . RIDER TV MANUALSnow run to 13 volumes. 13th manual,covering receivers from Sept. '53 to May'54, should be off press now . . . L. M.

BRAUN has been appointed sales mgr.,Parts & Service Dept. of the New Jer-sey Div., Zenith Radio Corp.

IMPROVED RADIO -TV SELENIUMRECTIFIERS are being offered by Int'lRectifier Corp. Bellows -type springcontactors between cells, affordinglonger life and lower forward voltagedrop, are now being used. This type ofconstruction was formerly found onlyin high -quality industrial stacks . . .

PETER BUTTACAVOLI, formerlytechnical supervisor of the TelesetService Dept., Du Mont Receiver Div.,has been promoted. New post is that ofmgr. of Field Technical Services . . .

CALDWELL-CLEMENTS, INC., pub-lishers of MART, TELE-TECH andTECHNICIAN, have taken more spacein Grand Central Palace, now occupyquarters on 5th, 6th, 8th and 9th floors.Expansion is result of 17% increase inbiz for 1st 1/2 of '54.

SPECIALLY BUILT TEST CHAM-BER is being used by Setchell-Carlsonto check receivers taken off the produc-tion line. After 727 hours of continuousoperation, one set was still going . . .

WARREN L. HASEMEIER, old-timerin the field and formerly with Wilcox -Gay, is now operating as a manufac-turers' rep. He's located at 128 GulfDrive, Sarasota, Fla. . . . EXPLODED -VIEW PARTS DISPLAY, using actualcomponents with guide ribbons showingtheir location in the equipment, wasfeatured at the Parts Show for all Web-cor phonographs and recorders.

RADIO'S OLD TIMERS' annualcocktail party saw the newly electedslate of officers taking over. CharlesGolenpaul of Aerovox is the new prexy. . . APPLICATIONS CONTEST forselenium diodes is being sponsored byInt'l Rectifier Corp., 1521 E. Grand Ave.,El Segundo, Calif. First prize is a FordV-8 Tudor Sedan. 50 other prizes total$1500. Last date for entries is Jan. 1,'55. Details and entry blanks availableon request . . . STROMBERG-CARL-SON is back in the radio field with aline of newly styled battery and 3 -wayportables.

NEW FINANCE PLAN to cover thedull months is being offered by Nat'lUnion Radio Corp. Plan requires nocash payment until 2nd mo. after orderand extends discount period over 5 mos.. . . AMPHENOL (American PhenolicCorp.) of Chicago, U. S. A., will alsooperate in Canada. It returns to ournorthern neighbor as Amphenol Can-ada Ltd. . . . CHANNEL MASTER'STV Engineers' Award has been set upto acknowledge "outstanding contribu-tions resulting in the betterment of TVtransmission and reception." First re-cipient was Ray Rodgers, chief engi-neer of Pittsburgh's WDTV . . . SAULKOTCHOVER has joined the sales staffof Parkside Wire Co., Francisco andIrving Park Rd., Chicago. Parksidemakes all types of electrical and TVwire . . . OXFORD ELECTRIC CORP.appoints a new sales rep: Lowry -Die-trich Co. of Pittsburgh.


TeleVolt AUTOMATICALLY

Provides Constant Voltage

For Proper

TV PERFORMANCE and

SET PROTECTION

Bad voltage from overloaded linesshifts TV tube operating points andoften causes distortion, fuzzy picturesand .-jitters; high voltages damagecomponents. The SOLA "TeleVolt"Constant Voltage Transformer auto-matically stabilizes voltage within-±3%. It automatically protectscostly components against high volt-age surges while it enables any TVset to deliver peak performance. Itis an automatic voltage stabilizer ...not a voltage booster.

Actual line volt-age may varyat 15% or moreover nominal

value

The Sola leleVoltautomarically

stabilizes voltagewithin ±3%

Write today for Bulletin 8G -CV -175or see your electronic distributor

SOLA TeteVogtAutomatic Constant Voltage

TRANSFORMERS

SOLA ELECTRIC CO.4633 W. 16th St. Chicago 50, III.

ADVERTISERS INDEX

JULY, 1954

Aerovox Corp 41Astatic Corp. 39

CBS-Hytron Div., ColumbiaBroadcasting System, Inc 31

Caldwell -Clements, Inc. 45Channel Master Corp. 12

Clear Beam Antenna Corp. 2Crosley Div., Avco Mfg. Corp. 8

Delco Radio Div., GeneralMotors Corp. 3

Erie Resistor Corp. 43

Federal Telephone & Radio Co. 11

Fretco, Inc. 35

General Cement Manufacturing Co. 9

International Resistance Co. .. Cover 2

Jensen Manufacturing Co. 4

Karyall Body, Inc. 47Kester Solder Co. 43

Mallory & Co., Inc., P. R. 10Miller Sales, Ken 45Moss Electronic Distributing Co., Inc. 41

Radio Corp. of America Cover 4Raytheon Manufacturing Co. 7

Shure Brothers, Inc. 6Sole Electric Co. 47Sprague Products Co. Cover 3Sylvania Electric Products, Inc. .... 27

Teltron Electric Co. 47Triplett Electrical Instrument Co. 29Tung -Sol Electric, Inc. 36, 37

Winegard Co. 5

While every precaution is taken to insureaccuracy, we cannot guarantee againstthe possibility of an occasional change oromission in the preparation of this index.

RICHARD McQUEEN has been ap-pointed Adv. & Promotion Mgr. for theNational Company, Malden, Mass. An-nouncement was made by Lynn Eaton,vice-prexy in charge of sales . . .

COUNTER DISPLAY of the completeline of alignment and specialty toolsmade by Walsco Electronics Corp., LosAngeles, occupies only 2 sq. ft. of val-uable counter space. The double-deckerdisplay is free with purchase of thetools . . . VOLUME PRODUCTION OFPOWER TRANSISTORS is getting un-der way at the plant of Minneapolis -Honeywell Regulator Co. Just to provethat the transistor age is catching upwith us, RCA has announced price re-ductions on 2 transistor types.

ALLERGY SUFFERERS may findwelcome relief from room -sized aircleaners. Raytheon Mfg. Co., Waltham,Mass., says the cleaners use static elec-tricity to filter microscopic particles ofdust and pollen out of the air . . . 5_

TELTRON TUBESGUARANTEED

LOWEST PRICE EVER!All tubes Individually boxed . . . unconditionallyguaranteed for one year.

OZ4 .45 6AH4GT .65 6F6 .42 I2AX7 .61

1A7GT .53 6AJ5 .96 6F5GT .44 12AZ7 .65

1H5GT .51 6AK5 .96 6H6 .50 12B4 .72

1L4 .51 6AQ5 48 6A F4 1.02 12BA7 58

1L6 .51 6AR5 .48 6.15GT .49 12BH7 .61

1LC6 49 6AT6 .37 6K6GT .39 12BZ7 .63

I N5GT .51 6AU5GT 60 6L6 .78 12K7 .40

1R5 .51 6AV5GT .60 6S4 .41 125N7GT 56

1S5 .43 6AX4GT .60 6S8GT .65 19BG6G 1.48

1T4 .51 6AX5GT .60 6SA7GT .45 1978 .71

1114 .51 6BA7 .58 6SK7GT .45 2513Q6GT .82

1U5 .43 6BC5 .48 6SL7GT .60 25W4GT .431X2 .65 68E6 .46 6SQ7GT .38 25Z5 .55

2A3 .35 6BF5 .48 6U8 .76 25Z6GT .36

2A7 .35 68F6 8 6V3 .80 35B5 .48

3Q4 .53 6BG6G 1.18 6V6GT .48 35C5 .48

3Q5GT3S43V4

.61

.48

.48

6BH66BJ66BK5

.51

.51

.75

6W6GT6X46X5GT

.53

.37

.38

35L6GT .4135W4 .3335Y4 .42

5V4G .49 6BL7GT .78 6X8 .80 35Z5GT .33

5Y3GT .30 6BN6 .90 7F8 .49 50A5 .49

5Y4G .40 6I3Q6GT .83 7N7 .49 50B5 .48

5Z3 .42 613Q7 .85 12AL5 .43 5005 .486A86K76Q7

.40

.40

.40

6BY5G6C46CB6

.60

.41

.51

12AT612AU612AV6

.37

.43

.42

Type 80 .40

117Z3 .33

6A846AC7

.43

.656CD6G6CU6

1.63.95

1122AAVx74GT ..6703 111177zL76GGT

.65T1.20

SPECIAL! . . . till Sept. 1

.55 613Q6GT .75 128E640 6.656827 .80 12807

6J6 .486SN7GT .48

12SA7.44 12SK7

1B3GT5U4G6AC76AG5

.40

.62

.43

.43

6AL56AU66AV66BA6

.28

.35.34.3825L6GT

6786W4GT12AT712AU7

.57

.35

.53

.47

12SL7GT .4512SQ7 .35

.3550L6GT .49

66K7 .78 I2BA6 .36

FREE! $7.20 list value Bonus Box of three 6SN7tubes and 25 assorted resistors with each order of$25. or more. GIFT OFFER! One 6BG6G tube will beshioped FREE with any order accompanying this ad.SHIPPING TERMS: All orders shipped same day re-ceived! Minimum order $10. 25% deposit on CODorders -save parcel post charges. Orders accompaniedwith full remittance shipped prepaid anywhere incontinental USA. All orders sublect to prior sale.

TELTRON ELECTRIC CO.428 Harrison Ave., Dept. 1-7, Harrison, N.J.

Phone HUmboldt 4-9848

You'll earn more profits with

KARYALL COMPARTMENTS

KEEP YOUR TOOLS ORGANIZED ANDSAVE TIME ON YOUR SERVICE CALLS

Made in sizes to fit full length of truckbed: 78"-88"-96"--108"

Complete with brackets for easy installa-tion.Karyall Compartments convert any TA, 1/4

or 1 ton pick-up truck into a handy mo-bile service unit.

Immediate delivery from our completestock.

- Mail this coupon today -vv.--for specifications and prices

Name

Company

Address

City State

KARYALL BODY, INC.8221 Clinton Road Cleveland 9, Ohio

Department T


Audio and Hi-Fi ProductsRecording Accessories, Speaker Housings, FM Units

Alonge TAPE SPLICERThis non-magnetic recording tape

splicer is designed to make a preci-sion splice in a few seconds. Cuttingarm uses 3 knives: the center knifecan be set to cut tape at 90, 67% or45 degrees. Pressure pads made ofnon-magnetic bronze hold tape inplace while 2 side knives cut thesplicing tape to width. Alonge Prod-ucts, Inc., 163 West 23rd Street, NewYork 11, N.Y.-TECHNICIAN

Carter CUSTOM CONVERTERHi-Fi ac installations in areas

where only dc power is availableare facilitated by custom converterno. DR1025C5PK. This 500 -watt unitis designed to avoid wide fluctua-tions in output voltage common toordinary dc -ac converters. It alsoprovides means for holding outputfrequency to 60 cps, so that accuratespeed may be maintained for taperecorders and phonograph turnta-bles. Carter Motor Co., 2644 N. Ma-plewood Ave., Chicago 47, Ill.-Technician

Pentron AM -FM TUNERModel AFM incorporates a selec-

tor which includes a positionmarked "tape." This position permitstape recordings to be modified bythe tuner's tone control system. TheAFM permits simultaneous listeningand tape recording during broadcast.Tape output is built-in. Other fea-tures: 5 microvolt sensitivity, Foster -Seeley discriminator, push-buttonafc, tone controls, magnetic cartridgepreamp with 3 -position equalization,cathode -follower output. $85.95 net.Pentron Corp., 221 E. Cullerton St.,Chicago 16, Ill.-TECHNICIAN

Yale TAPE SPLICERThe TS -4 splicer for recording

tape cuts two rounded indentationsin the tape, giving the splice a Gib-son -Girl shape. This leaves tapeedges free of adhesive, and elimi-nates a frequent cause of wow andflutter. May be mounted directly onany tape recorder. Toggle -type fin-gers hold tape in position for splic-ing. Yale Industries Corp., 82-09251 St., Bellerose, N.Y.-TECHNI-CIAN

Lowell SPEAKER BOXESNew enclosures for sound -system

installation have been added to themanufacturer's line of speaker en-closures, baffles and accessories. Inthe larger units, resonance is mini-mized by heavy undercoatings.Many models are available with ad-justable plaster flanges. 3/4 in.knockouts provide for PA and inter-com wall and ceiling installation.Speaker boxes are constructed of 18gauge steel. Depth range: 4 in.9 in.Lowell Mfg. Co., 3030 jo a clade Sta-tion Rd., St. Louis 17, Mo.-TECH-NICIAN

Cousino TAPE REPEATERThe Universal 300 Audio -Vendor,

automatic repeating device, embod-ies an integrated reel and magazineof magnetic tape. Output of a radioor TV can be plugged into any taperecorder for continuous recordingwhich preserves 10 -minute seg-ments before they are automaticallywiped off. When it is desired to re-tain a passage, the recorder is

stopped after the number has beenrecorded, but before it is wiped off.The tape, which need never be re-wound, may be re -used indefinitely.Cousino, Inc., 3212 Madison Ave.,Toledo 2, Ohio.-TECHNICIAN

H -R REMOTE VOL. CONTROLSoundoff, a chairside remote

speaker control unit, permits con-tinuous adjustment of sound -outputlevel from the TV set or radio towhich it is connected. Range is fromwhisper level to full speaker out-put. Unit comes complete with cableand illustrated instructions for con-necting to speaker. Hollywood Rivi-era Co., P. 0. Box 11635, WagnerStation, Los Angeles 47, Calif.-TECHNICIAN

Stephens SPEAKER CABINETThe Cavalcade enclosure permits

direct radiation from the loud-speaker and also employs a fullyexpanding dual exponential horn forrear loading. It has been created tohouse such Stephens Tru-Sonicspeakers as the 15 -inch coaxial206AX, the 101FR or the 102FR.Blonde or mahogany finish. Netprice, $131.25. Stephens Mfg. Corp.,8538 Warner Dr., Culver City, Calif.-TECHNICIAN

Masco INTERCOMSThe Multifone intermixed inter-

com systems include a five stationmaster, model MF-5, which can beconnected to a combination of up to5 other masters and/or remotes, andmodel MF-10, which is similarlyused with up to 10 other units. ModelJS -6 remote station with 6 -positionmaster station selector switch andtalk -listen switch can originate callsto one master only. Features includeac -dc operation, low power con-sumption, pilot light, and U/L ap-proved construction. Mark SimpsonMfg. Co., Inc., 32-28 49th Street,Long Island City 3, N. Y.-TECH-NICIAN

E -V FM BOOSTERTune-O-Matic model 3005 -FM

booster is designed to make a goodsignal impervious to noise and makea weak signal usable. The boosterincreases signal strength over 10times (20 db). Broad -band circuitamplifies the signal uniformlythroughout the FM spectrum. Noadditional controls or manual tun-ing. Thermal relay is provided sothat booster can be turned on or offby receiver. Can be concealed. Listprice, $45.00; net, $27.00. Electro-Voice, Inc., Buchanan, Michigan.-TECHNICIAN

Rek-O-Kut STROBE DISCAlternating pattern bands on this

turntable test card are printed in redand black to prevent confusion dur-ing use. Instructions for use in check-ing turntable speeds at 33%, 45 and 78rpm are printed on the Rek-O-KutStroboscopic Card. Available free.Avery Yudin, Rek-O-Kut Co., 38-01Queens Blvd., Long Island City 1,N. Y.-TECHNICIAN

48 168 pages this issue, including Circuit Digests section)TECHNICIAN July, 1954

capacitorreplacements

FOR SETS OF THE MONTHADMIRAL CHASSIS 20 L 2

Symbol Rating Admiral SpragueNo. MF @ WVDC Part No. Replacement

C205 4 @ 50 67A4-9 TVA -1303 SymbolC207 60 4- 40 @ 350/60 @ 200/

20 @ 150 67D15-23 TVL-4609No.

C48C216 80 @ 350 67D1 5-64 TVL-1 630C409 80 @ 350/100 @ 50 67D15-22 TVL-3722 C63C410 20 @ 475 67A25-1 TVA -1 804 C91C423 .10 @ 300/10 @ 25 67D1 5-33 TVL-2565 C95

GENERAL ELECTRIC "G" LINEC130

Symbol Rating G.E. SpragueNo. MF @ WVDC Part No. Replacement C151

C235 20 @ 300 RCE-175 TVA -1608 C103

C236 20 @ 300 RCE-175 TVA -1 608C308 5 @ 50 RCE-174 TVA -1303

C400 80 60+40+20 @ 350 TVL-3640RCE-173 TVA -1716

MAGNAVOX 300 SERIES CHASSISSymbol Rating Magnavox

No. MF @ WVDC Part No.C106 4 @ 50 270027-10C110 20@ 350 270027-20C215 2 @ 50 270027-22C413 10 @ 350SP 270027-23C501 70---40---1O@ 350/50 @ 50 270021-52

C502 20 -10+5 @ 350/60 @ 200 270021-51PC301 INTEGRATOR PLATE 250186-1

SpragueReplacement

TVA -1303TVA -1 608TVA -1 301R-1468TVL-4659

/ TVA -1308TVL-4620TVA -1613V-1

TRAV-LER CHASSIS 46A3, 46113Symbol

No.EC -6

EC -16

EC -17

EC -20

EC -25

EC -27C87(R79

RatingMFD @ WVDC

Trav-LerPart No.

SpragueReplacement

70 @ 1040 +40 @ 450

40 @ 450/50 @ 50

10 @ 50

30 @ 450/50 @ 200

100 @ 25

INTEGRATOR NETWORK'

TV -EC -6TV -EC -16

TV -EC -17

TV -EC -20

TV -EC -25

tV-tC-27

TV-rC-26

TVA -1130TVL-2764

C TVA -1713TVA -1308TVA -1 304TVA -1711

/ TVA -1713TVA -1 207

V-1

Sprague makes more capacitors ... inmore types . . . in more ratings . . .

than any other capacitor manufac-turer. Send 10c for 48 -page TVReplacement Capacitor Manual toSprague Products Co., 65 MarshallSt., North Adams, Mass., or get itFREE from your Sprague distributor.

DON'T VE VAGUE...INSIS'

SPARTON CHASSIS 23V214

RatingMF @ WVDC

SpartanPart No.

SpragueReplacement

2 @ 50 PA4303-14 TVA -130160+40 @ 350/20 @ 200 PA4307-34 TVL-3640

5 @ 50 PA4308-2 TVA -1 303

20 @ 450/20 @ 400/100 +20 @ 50 PA4307-36 TVL-4740

40+20+10 @ 450 PA4307-33 *TVL-484040 40 @ 450/10 @ 350 PA4307-35 TVL-3785

.002-1-.005-1-.005 PA4339-4 34C 1 7

* OMIT ONE 1 OMFD SECTION

FIND THE RIGHT

TV Yoke CapacitorIN A JIFFY!

OKE CAPAO TOR

!ilGUE TVREYPEACEMENT KIT

Just try the different ceramics inthis Sprague TV Yoke CapacitorReplacement Kit until you get agood picture. That's all there is toit! 36 famous Sprague Cera-Mite®Capacitors, in eight different valuesselected and proportioned on thebasis of actual need, providing com-plete coverage of fractional valuesbetween 33 mmf and 82 mmf. Thetiny ceramic discs fit any yoke assem-bly . . . stand up under the toughestservice . . . are excellent replace.ments for any 2000 volt capacitorwhich may appear in original equip-ment. Complete instructions are onthe face of the tough, paper -boardcard, conveniently punched for hang-ing over the service bench. Getyours now! Ask your distributor forSprague Kit CK-1. Only $12.60 List!

RCA researchis constantly at workINSIDE EVERY

RCA TUBE

Same basic type number...better tube! RCA Receiving Tubes

undergo continual improvement, to help you do a better job

Take an RCA Receiving Tubeout of its famous red, white andblack carton. Examine it ! You'relooking at a product of constantdevelopment by RCA Engineers-to give you superior tube per-formance and top tube value.

RCA is constantly improvingtube design and making theseadvances without changing thebasic type number. Yet RCAasks no premium for improve-ments ! You get increased valuewith RCA Receiving Tubes !

Tubes shown here are typicalexamples of RCA's program ofconstant product improliement.

RCA-1B3-GT. This rectifier tubehas been improved to handle thehigher voltages required by "big -picture" TV sets. Tube safety fac-tors have been increased throughuse of a special glass envelope andhydrogen firing of this envelope.Result: Longer Life.RCA-6BQ6-GT. This horizontal de-flection amplifier tube has been im-proved to minimize grid emission,stray emission, and TV picture"jitters." Result: Superior Per-formance.RCA -613Q7 -A. Here's a miniaturetype twin triode with improvedstructure that does away withheater cathode trouble. Built tostand up in rf amplifier systemsoperating 24 hours a day. Replacestype 6BZ7 in practically everysocket...offers equal performanceat a lower price! Result: Plusfeatures, at no extra cost.

When you sell a replacement tube, your profit and reputation are atstake. That's why it pays to use the best in Receiving Tubes-RCA.

RADIO CORPORATION of AMERICAELECTRON TUBES HARRISON, N.J.

IELECTRON TUBE EMIR Mt

-WARRANTS-0

AGAINST INFECTS

IN WOIKMANSINP,

MATERIALS

AND CONSTRUCTION

Documents

IRC GUARANTEES SATISFACTORY MECHANICAL FIT AND ELECTRICAL OPERATION OR DOUBLE -YOUR -MONEY -BACK The typical manufacturer's specifications shown here are exactly duplicated b