HORIZONTAL OUTPUT TRANSFORMERS · important replaceable parts of a tv receiver. The series will discuss the following topics 1. use and replacement of horizontal out-put transformers

HORIZONTAL OUTPUT TRANSFORMERSTheir Use and Replacement

by Albert Friedman and Victor Markosian*

In the early days of radio, one of the firstproblems to face the industry was one ofparts replacement. Initially, the manufacturerof radio receivers was the only source forreplacement parts for his receivers and com-plete anticipatory inventories of all types ofitems were maintained. However, as the in-dustry grew and radio receiver distributionbecame nation wide, a sharply defined needfor additional sources of replacement partsmanifested itself. This need gave birth toreplacement manufacturers whose sole func-tion consisted of supplying related componentsthat could be used in all types of radio equip-ment and still satisfy individual manufac-turer's specifications.

The advent of television again brings thereplacement situation into focus. In somecases the original parts are easily available;in others, deliveries are slow or they are nolonger available. To further amplify thisproblem, there is still no manufacturer-author-ized, centralized source to designate whichmanufacturer of replacement parts makes unitscorrectly and exactly designed to fill the re-quirements of each of the various tv re-ceivers.

In allied industries, such as the automotivetrade, a factory -authorized index lists theapproved exact replacement parts for eachmanufacturer and thereby eliminates the con-fusion that exists in our industry. Until some

recognized authority in our field publishesthis type of information, the serviceman has nochoice but to use any information indiscrimi-nately made available to him. There areagencies in our industry whose basic functionqualifies them to compile and prepare thisinformation. Until exact replacement informa-tion is made available, however, the consci-entious serviceman, who wants to do a goodreplacement job and reduce costly callbacks,must know how to determine what replacementparts to use in various receiver circuits.

In this and subsequent articles we are goingto cover the replacement of some of the more

Horiz.0.rut oo

o

E H .V.

H.VRect.

Yoke

B

Dam

CI

Fig. 1. flock diagram of a typical flyback,horizontal output circuit.

*Albert Friedman is National SalesEngineer and Victor Markosian, ChiefEngineer of Ram Electronics, Inc. Allfigures for this article are throughthe courtesy of Ram Electronics.

important replaceable parts of a tv receiver.The series will discuss the following topics

1. use and replacement of horizontal out-put transformers

2. use and replacement of deflectionyokes

3. use and replacement of width andlinearity coils

4. proper use and application of conver-sion units.

In this article, we will discuss the replace-ment of horizontal output transformers usedin flyback high -voltage supplies. First, how-ever, it may be helpful to review the operationof a typical flyback circuit.

Operation of Flyback Circuit

In Fig. 1 is shown a block diagram of a con-ventional flyback circuit. This circuit sup-plies the sweep voltage to the horizontal de-flection system of the receiver cathode-raytube, as well as the high -second anode voltagefor the crt.

The output amplifier (A) receives a signalfrom the horizontal oscillator and amplifiesit. This signal is impressed across part of theprimary of the horizontal output transformer.One secondary draws high current variationsby means of step-down turns ratio. This cur-rent operates the deflection coils of the yoke

(Continued on page 7)

Successful Servicing, March, 1952

ArdrAr AOVA", ArRIDER TVTekke RELEASES OS1

forMARCH, 1952

All this data is advance infarmation which will appear in Rider's Television

Manual Volume 9 - out in April.

Get a complete listing of models available in TEK-FILE.

Ask your favorite jobber for TEK-FILE Index No. 3.

EMERSONModel Pock 50

700D, 701D (CH. 120158-B).

FREEDModel Pack 50

110, 111, 112 (CH. 700-120)121

GENERAL ELECTRICModel

17(11217(11317(11417(115, 17(117, 1702017T4, 1725, 17T617T7

Pack SO

HALL IC RA FTERSModel Pack 49

680, 681, 690 (CH. 8919120,Run 3)

715, 71SA (CH. 8919120 Run 3)811 (CH. E800D, Runs 2.8)818 (CH. K8000, Runs 2-8)820, 821 (CH. E8000, Runs 2-8)860, 861 (CH. E8000, Runs 2-8)14808 (CH. R900D, Runs 1 & 2)178040 (CH. L8000, Runs 1-3)17810C, 17810M, 17810MG (CH.

P800S, U8005, G900S, Run 1)17812, 17813, 17815-H (CH.

L8000, Runs 1.3)17819, 17824, 17825 (CH.

L800D, Runs 1.3)17838 (CH. L8000, Runs 1-3)17848, 17849, 17850 (CH.

L8000, Runs 1-3)20872 (CH. P8005, U8005,

69005, Run 1)20823 (CH. M900D, Run 1)208238 (CH. L900D, Run 1)20990, 20990S (CH. 18000)20994 (CH. 1800D)Red. Ch. Gen'I Instr. 700F

INTERSTATE STORES (PLYMOUTH)Model Pack 50

AR -21, AR -218AR -71, AR -718AR -73LARC -21, ARC -21BARC -71, ARC -718ARD-21M, ARD-228ARD-72, ARD-72B

MONTGOMERY WARD (AIRLINE)Model

Pack 51

158R -3048A15WG-3049A

MOTOROLAModel Pack 51

17F1, 17F2W, 17F3B, 17F4,

17FS (CH. TS -118A, TS -1186)V-2210-1, V-2202.3)

17F6, 17F7, 17F7B, 17F8, 17F9(CH. TS -118A, TS -1180)

17K3, 17KS, 17(6, 17K7 (CH.TS -118A, TS -1188)

17K10E (CH. TS -314)17K1OE (CH. TS -314A)17T2, 17T3, 17T3X1, 17T4 (CH.

TS -118A, TS -1186(17T5A, 17T5CA (CH. 15-214)17TSE (CH. TS -314)17TSE (CH. TS -314A(17T5F (CH. TS -315(17TSF (CH. TS -315A)17T6G (CH. TS -314A)

MUNTZModel Pack 51

2053-A, 2054-A, 2055-A, 2056-A(CH. 1781, 1782)

2055-13 (CH. 1762)2158-A, 2159-A, 2162-A (CH.

1785, 1786)2457-A, 2461-A (CH. 17B3,

1784)WG2060

PACKARD-BELLModel Pack 52

2111, 2112, 2113 (CH. 2111-2)2114 (CH. 2114)26112311, 2811, 2811 LoteRed. Ch. Webster 100, VM9S0

PHILCOModel' Pack 52

52-12100, 52-T2144 (CODE 121)52-T2145X (CODE 125)52-T2182, 52-T2182L(CODE 121)Red. Ch. Philco M-22

PILOTModel Pack 53

TV -271, TV -273, TV -274TV -293, TV -294

SCOTTModel Pack 54

AC -17, AT -17, Ravenswood (CH.720)

310, Croydon (CH. 720)510, Cressy (CH. 720)320, Croydon (CH. 920)S20 -TA, Ashly (CH. 920)910, Waverly (CH. 920)924, Wellington (CH. 924)1000-TC, Chippendale (CH. 924)Red. Ch. Milwaukee 11600,

Webster 100

SEARS, ROEBUCK (SILVERTONE)Model Pack SS

102-A (CH. 549.100-7)128-16 (CH. 478.337)153-16 (CH. 478.341)163-16 (CH. 478.319)

165-16 (CH. 100.120)166-16 (CH. 478.339)166-17 (CH. 478.339-A)168-16 (CH. 549.100-1)175.16 (CH. 549.100-5, 549.100-

8, 549.100-9)175-16A (CH. 549.100-5, 549.-

100-8, 549.100.9)176-19 (CH. 549.100-6)1132-17 (CH. 476.376)1146-20 (CH. 132.014)1150-14 (CH. 478.361, 478..

361-A)1163.17 (CH. 478.375)1166-17 (CH. 478.339-B)

SHERATONModel Pack 54

260 -DX, 260 -FM, 260-S, 260-V

SONORAModel

323, 324Pack 54

SPARTONModel Pack 56

S107, Whitney (CH. 26551700)5107X, Whitney (CH. 2655171)5108, Whitney (CH. 26551700)5110, Berkeley (CH. 26SS1700D)5125 (CH. 26551700D)5162X, 5163X, Gramercy (CH.

2655171A)5165X, 5166X, Sheffield (CH.

2650171)5175X, Rochelle (CH. 2650171)5178X, Del Mar (CH. 2650171)5191, 5192, Hanover (CH.

2550201A)

STEWART-WARNERModel Pack 56

9125-A9126-A, 9126-B9127-ARed. Ch. VM-509032

TRAD

0Model Pack 54

C-2020, C-2420, CD -2020 (SERIES

WES

T-20E)

Pack 53 1°T-1720 (SERIES T-20

TERN AUTO (TRUETOIdel201091 (CH. 12AX27(2010922D1095A (CH. 16AX27(2020434, 2020478 (CH. 12AX27)202049A (CH. 16AY210(202052A, 2020528 (CH. 16AY-

210)202052C (CH. 17AY23(2020520,202052E (CH. 17AY28)

WESTINGHOUSEModel Pack 54

H -653K24, Carlyle (CH. V-2202-2,

JOHN F. RIDER PUBLISHER, Inc. . . . 480 CANAL STREET, NEW YORK 13, N. Y.

CAUTION CN 166H VOLTS

/002Q00 OFF----1 '-

0.300 -ADJ C 60---'

A

C

V OUTPUT

CQM

!1

For service, accuracy, highest dependability, bug

Your dollar buysm oreesinstriunent"...in our Model

by R. L. TriplettPRESIDENT

Because we build every majorpart of our instruments the quality iscarefully controlled. For example, weknow we have more torque drivingour pointers because we designed andbuilt the complete instrument. Weknow we have sustained dependencein the shafts and switch contacts ofour test equipment for the same rea-son. Cycle tests for switches exceedseveral times the rigid requirementsof the armed forces.

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t%PRESIDENT

TRIPLETT ELECTRICAL INSTRUMENT CO.

Bluffton, Ohio

Model #630Volt -Ohm -Mil -Ammeter

Triplett)-w)Lé

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4Successful Servicing, March, 1952

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Juccar

SERVICI NGREG. US. PAT. OFF.

Dedicated to the financial and technicaladvancement of electronic maintenance personnel

Volume 13 Number 5 March, 1952

JOHN F. RIDER, PublisherAnnette M. Tricarico, Editor

Advertising RepresentativeH. J. Olsow & Co.

3951 Grand Central TerminalNew York 17, N. Y.Murray Hill 6-4670

MEMBER

Curtain JimeOpen Letter to Mr. Albert CoumontRTMA Service ManagerDear Al,

First of all, let me take this opportunity of wishing you the bestof success in your new assignment as Service Manager of RTMA.Having had the pleasure of spending a substantial number of hourswith you, I feel certain .that you will do a grand job for theservicing industry as a whole, and for the RTMA. Heavens knowsthat the TV servicing industry needs an individual like yourselfto carry the ball on many issues!

For example, here is something which deserves serious considera-tion by you, the RTMA, and the Better Business Bureau. Formany years past, the public has been uninformed on a very importantmatter - the differential between the list price of a radio or tvreceiver and the cost of having it serviced properly.

The public is aware of the fact that the ability to buy a tvreceiver for only $199 or $295 sterns from mass production. Ifa manufacturer produced only one set a day, or even a dozen, thelist price conceivably could be $500 or perhaps $1,000. Certainly itwould be several times the list price now being charged.

Assuming mass production at the factory, what happens when atv (or radio) receiver comes into the service shop? Now it is asingle item no longer entitled to the advantages of mass production.The service technician must treat that receiver the same way hewould a custom-made set. The parts used may be similar to partsused in thousands of other receivers, but as far as he is concerned,whatever he replaces in the defective receiver must be handled on

an individual basis. The public must realize that mass productiontechniques in receiver manufacturing cannot be applied in repairactivity. There is no production line for the diagnosis of the faultor for the accomplishment of the repair. If a service shop handlesa dozen or even two dozen receivers a day, production line techniquescannot be applied, because these receivers may be of varied modeland circuit designs.

The mass purchasing power of the factory is reflected in the costof the parts which go into the assembly of the receiver, affecting thelist price, but does not exist in the service shop. Many parts usedin tv receivers are singular, that is only one of a kind is used -but the manufacturer can buy these items in tens of thousands oreven million quantities. The service shop owner on the other handbuys singular items individually, because he does not know how manyof the same model will come into his shop for repair - and even ifa dozen come in for service, the same fault will not be present inall of them. Therefore, his cost per item is higher.

The sum and substance of the whole thing is that the cost ofparts to the service shop is substantially higher than the cost ofparts at the set manufacturing level. This is reflected in the repaircharge, and the advantages accruing to the public because of massmanufacturing should not, and cannot be expected at the servicinglevel !

There is another extremely important point which must be broughtto the attention of the public. . . . You are the man to do thisthrough the RTMA and every other possible medium. I am referringto the relation between the cost of items which are frequently re-placements in a receiver and the overall service charge.

The public and some of the investigating bodies have criticizedthe servicing industry for charging five dollars for time and laborwhen replacing an item which costs only pennies - say 15 or 20cents, as for example, a resistor. The same could be true of a tubewhich costs $2.00 or a capacitor which costs 80 cents.

What the public loses sight of is the fact that the replacementof a part, no matter how small, involves a number of operations.prior to the actual replacement - diagnosing the fault, makingmeasurements to determine the precise part gone bad, etc. Thisall consumes time, and the end result may be merely the replacementof a cheap resistor. Also, time can be spent waiting for the receiverto heat up, tuning the receiver and noting the fault; making minoradjustments here and there.

Also involved is the expenditure of traveling time to the home,examination there, pickup, and eventual delivery to the home.Even disregarding the pickup and delivery time, the fact remainsthat the effort and time required for the replacement of a cheapitem is not based on the cost of the item.

It is entirely possible that it is no more time consuming to replacea $15.00 item than a 50 cent item. But the rent paid by the serviceshop owner, or the equipment he must buy, or the insurance hemust pay is not based on the list price of an item. These factors,and many others which are related to time and overhead, areresponsible for the disproportionate charge for time and parts inmany instances, and it cannot be helped.

Now Al, what the servicing industry needs from you and RTMA,is the publication of a booklet for the public which tells the storyof mass production. A booklet of this kind has been needed formany years. It would help make the public understand why a $6.95midget used tubes which listed for $7.50, or why a $19.95 or even$29.95 receiver may cost $10.00 to service. Today, the public evalu-ates the justice of a service charge, especially the time charge, onthe basis of the cost of the part replaced. This is wrong and wehope that you will be able to correct it.... We know that it isgoing to be difficult to do so, but I trust that you, the RTMA andthe Better Business Bureau will try. Thanks !

SUCCESSFUL SERVICING is published monthly by JOHN F. RIDER PUBLISHER, INC., 480 Canal Street. New York 13.N. Y. Telephone: Worth 4-8340. No portion of this publication may be reproduced without written permission of the publisher.Copyright 1952 by John F. Rider Publisher, Inc.

Succefsful Servicing., March, 1952

_L = 3 4 57 8 to II Ix 13i. nt8tqxo

25 26 27

guaranteed

for

months from date of installatioñ

Write for complete information

on the Du Mont tube line.

Here is a warranty with salesappeal - with your customer partic-ipating in the registration of hisTeletron. A series of three cardsare supplied with each Teletron.One copy is retained by you, a sec-ond is retained by the set owner andthe third is sent to Du Mont provid-ing complete protection for the setowner for a period of six monthsfrom the date of installation againstany defects in the Teletron.

*TRADE MARK

CATHODE-RAY TUBE DIVISION, ALLEN B. DU MONT LABORATORIES, INC., CLIFTON, N. J.

Please mention Successful Servicing when answering advertising.


Horizontal Output TransformersTheir Use and Replacement

, ommued from page 1

Fig. 2. Schematic of a horizontal flyback circuitusing a Ram type X066 transformer.

(B). At the same time, the transformermatches the low impedance value of the yoketo the horizontal -output circuit.

The transformer primary also acts as anauto -transformer; the high potential devel-oped across the entire primary is half -waverectified and used to supply the second anodeof the cathode-ray tube (C).

When the horizontal -output tube stops con-ducting, due to the drop in signal voltage fedto it, a breakdown of lines of force in thetransformer induces a pulse of voltage in thetransformer secondary. This pulse tends toset up transient oscillations in the yoke sec-ondary circuit. To avoid these oscillations,the damper tube (D) is used. This tube ab-sorbs the power in these oscillations whichotherwise would appear as vertical bars onthe picture information. This extra power isrectified and filtered through a network con-sisting of a linearity coil (F) and two filtercondensers. Since this rectified voltage is inseries with the B+ of the driver tube it addsto it and, therefore, is called boost voltage.

The linearity coil as part of a tuned filtercircuit has a direct adjustable function on thelinearity of the waveform in that circuit.The width coil (G) is wired in shunt with aportion of the transformer secondary andtherefore provides some adjustment of itsoutput. This adjustment is in direct relationto the resultant width of the sweep.

For purposes of clarity we will condensea wide variety of actual flyback transformersand circuits into three basic groups. Theseare the ones which find the widest use inpresent day tv receivers.

A general description of all_flyback trans-formers will note that they are all of theceramic -core, high -efficiency type. Since theadvent of large -screen television tubes, pow-dered iron cores were found to be inadequate.As a result, to simplify production and in-crease the efficiency of older chassis, modifiedceramic -core units have been developed for

is connected to the highest tap on the trans-former while the deflection coil is connectedto the next lowest tap. Under these condi-tions, the voltage at the output of the linearitycoil will be about 500 volts with a B + volt-age of only 320 volts.

Figure 3 illustrates a somewhat differentcircuit. This is an early type of high -effi-ciency flyback unit. Its principle of operationis similar to that of the circuit :n Fig. 2. Thetransformer shown works well with hori-zontal deflection coils having incuctances from8 to 30 mh and will deflect a 21" picture tube.It produces about 14KV with a B+supply of 325 volts. The insertion of the HVfilter capacitor on the highest tap of the sec-ondary helps to produce this high voltage.Pin 4 tap on the HV flyback has a sharp nega-tive pulse of about 3KV at the same instantthat the positive pulse is delivered to the 1 B3.The addition of this voltage across the highvoltage filter boosts the HV to 14KV.

The width and linearity coils used in thiscircuit differ from those used with the previoustransformer. Whereas that circuit employsthe same type coils as used in early TS -630

6AU5-GT

3.3 Si. '

1B3-GT

470 D0

SDD MM/ 50ohmT

N.17MM

WIDTH I 5tEMT.

SOOn

6 W4-GT

.DSh.0611F I

-

Fig. 3. Early type, high -efficiency flyback circuit.(Ram X045 transformer)

Fig. 4. The Ram X054 autotransformer flyback circuit.This tlpe is useful in large -tube circuits.

use as replacement with smaller size tubes.Figure 2 shows a transformer used in con-

junction with an 8.3 mh deflection yoke. Thisdiagram shows a 6BQ6 as the driver tube,however, it is also common to ase either a6BG6 or a 6AU5 in such circuits. For pur-poses of maximum damping, the damper tube

type circuits, the width coil used with thetransfer shown in Fig. 3 has much higherinductance because of greater voltage betweentaps.

The third basic type of flyback transformeris illustrated in Fig. 4. Employing the prin-ciples of an autotransformer, it still retains

8

the function of a regular flyback transformer.Because of its autotransformer design, thehorizontal deflection yoke must be reversed.Therefore, the pulse on the "hot side" of the

yoke will be positive. In conformance with

this reversal in polarity, the damper tubemust also be inverted. B is applied to theplate of the damper and the developed boostvoltage appears on Pin 1 of the transformer.The deflection yoke used in this circuit has

a 30 mh horizontal winding.The autotransformer design reduces leak-

age reactance and distributed capacitance re-sulting in lower retrace time and ultimately,in fewer foldover problems. The resistor -capacitor combination connected between Pins

2 and 8 on the transformer is a current limit-ing device to reduce HV danger and is re-quired by Underwriters Laboratories. Thecircuit shown will sweep up to a 24" tubeand supply 14 to 15KV with a B + supply

of approximately 320 volts.There are many variations of the three

types of transformers we have discussed.Basically they all perform the same functions.Some have additional windings for keyed auto-matic gain control, feedback voltages, addi-tional filament windings and other such varia-tions including a separate winding for thewidth coil. With the latter arrangement, thewidth coil can be operated with one side con-nected to ground.

We cannot stress too strongly the fact thatone of the most important functions of theflyback transformer is deflectionyoke to the plate impedance of the driver tube.

A mismatch of these components can be evi-

denced in many ways. One very frequent re-sult of mismatch between these units is non -linearity or crowding at one side of pictureinformation. This condition can also be

caused by a mismatch between output tubeand transformer. Before a transformer re-placement is considered therefore, correct im-pedance, turns ratio and current capacity forthe transformer must be determined.

Replacement Considerations

If a flyback transformer is found to be de-fective, the following points should be con-sidered to obtain the correct replacement:

1. Check the receiver circuit diagram todetermine the type and size of wind-ings on the transformer to be replaced.In many cases, the receiver schematicfound in manufacturer -authorized ser-vice data (such as Rider Manuals orTEK-FILES) shows not only theimpedance values for the transformerwindings but also the color coding.

2. Determine the tube type, and the im-pedance of the yoke used, from thereceiver schematic or parts list.

3. Be sure to check whether the unit hasspecial windings for AGC, width con-trol or feedback purposes.

4. Consult a catalog listing horizontaloutput transformers for a transformerwith the windings required. The ter-minal arrangement may vary but if

the winding data per section is within15-20% of that required, the unit canbe used.

5. We emphasize at this point that the

driver plate winding should be heldas close as possible to required valuein order to assure proper impedance

match. Also, the taps used for thewidth coil should have the proper im-pedance to match the coil, as shouldthe windings used for the yoke. Allof these impedance values may be ob-tained from the schematic given withmanufacturer -authorized service data.

6. Examine the outline characteristics of

the transformer replacement, to besure that the new unit can be mountedin the space available, and will fit ontothe bracket already in place.

7. Do not under any circumstances selecta transformer designed to operatewith a tube having a lower currentrating' than the one used in the set.If the current drain on the transformeris too high its operating life will beshortened due to overheating.

8. Some original equipment is made witha resistance wound filament. It usuallyappears wound on the sleeving of the

filament lead. In replacement, con-nect a 3.3 to 3.9 ohm, 1 watt resistorin series with the filament circuit.

Trouble -Shooting Replacements

If all the foregoing considerations are made,the receiver should operate satisfactorily.However, due to circuit disturbances or slightmismatches, certain adjustments may have tobe made. Following are sonic of the vari-ances and the remedies for them.Insufficient Width

Use one, two, or all of the following :1. Shunt the width coil a .05 mf

capacitor.2. Adjust the drive trimmer to provide

more drive on the grid of the outputtube.

3. Increase the screen voltage of theoutput tube by replacing the screenresistor' with one of lower value. Thisis a trial and error process, try suc-ceedingly smaller values until the onegiving the best results is found.

CAUTION ! ! ! Increase voltage in steps ofno higher than 10% by change of resistancevalue.Low Second Anode Voltage

1. Remove or reduce capacitance acrosswidth coil.

2. Replace or remove width coil.3. Increase boost voltage by connecting

the vertical sweep to another B +source. Increasing the drive or screenvoltage will also increase HV.

4. Connect the cold or ground side ofthe HV capacitor to the top of theflyback secondary. This is usuallywhere the damper plate is connected.

Excessive HY1. Reduce drive on grid of output tube


by adjustment of driver trimmer.2. Reduce driver screen voltage by re-

placing the existing resistor with oneof higher value.

3. Shunt the width coil with varioussized mica capacitors, selecting theone rendering best results. Shunt thedamper tube with a 15K ohm, 10 wattresistor.

5. Reduce B + voltage to flyback witha series 500 ohm, 10 watt resistor.

HV Arcing or CoronaCheck for sharp points on soldered con-

nections. Dirt, excessive rosin flux or dustnear HV coils will also cause this condition.

1. Clean all soldered connections in HVsection with carbon tetrachloride.

2. Smooth and round all connections.3. Insulate core side from coil with high -

frequency vinyl tape. Use anti -coronadope on spots where tape cannot beapplied.

Non -Linearity1. Substitute shunt condensers on line-

arity coil. Use lower or higher valueto effect desired result.

2. Adjust drive trimmer for desired

linearity, then readjust to proper

width.3. Non -linearity is also a condition of

mismatch between flyback and yoke.Check to determine whether variationsin taps on secondary of transformercan be used to correct this condition.If this cannot be accomplished, amatching yoke replacement is neces-sary.

FoldoverBefore any component replacement is made

be sure that the horizontal oscillator coils

are properly adjusted. Special emphasis ismade regarding syncrolock or syncroguidecircuits. Tune both coils carefully to preventlock -in action. This condition can be blankedout by connecting the negative side of theyoke to the first anode of the picture tube bymeans of a voltage divider between the "hot"side of the yoke and the normal source offirst anode potential.Damping Bars

This condition appears as vertical bars onthe screen. It is usually caused by compon-ent mismatch, excessive drive, or failure inthe damper circuit.

1. Check the damper tube for efficiencyof operation.

2. Check adjustment of drive trimmer.3. The value of the capacitor in the de-

flection yoke may have changed invalue. Replacement with one of highervalue may correct this condition. Yokeand transformer matching is of coursethe basic check before any rewiring isattempted.

Careful consideration should be given toall aspects before the replacement of a fly-back transformer is made. We have purposelyavoided related effects of deflection circuitsas much as possible. This will be treated inthe next article.

Successful Servicing, March, 1952 9

TVversus

Radio Repair

How much time can a tv service technicianafford to lose? The answer is none. Thereason is simple : time is money in the servic-ing business. All of us know that it is im-possible to make every minute of the day payoff; but if we're given the job of taking thebugs out of a tv receiver it just doesn't makesense to plunge into it without looking arounda little bit.

TV receiver diagnosis and repair is vastlydifferent from radio -receiver diagnosis andrepair. Most a -m radio receivers producedduring the past six years are table modelsand contain 5 or 6 tubes; diagnosis of theseis simple in comparison to the 22-30 tubetv receivers. The same can be said about

by John F. Rider

the repair. Radio -receiver repair is replace-ment or adjustment; occasionally it entailsmodification in the circuitry as the means ofeffecting permanent cures of performancepeculiarities. These radio repairs still meanrecourse to service information of course-for, after all, differences do exist in thesereceivers; and it is to the distinct advantageof the service technician to know everythingpossible about the receiver being repaired.

On the other hand, TV receiver diagnosisand repair is much more complicated. It's notthat the video receiver contains circuitry whichis beyond understanding by the service tech-nician, but it is a case of taking advantageof every bit of known art. By "known art"

WESTINGHOUSE MODELS H440117, H -641K17CHASSIS V-2192, V-2192-1,

V.2192-2, V-2192.3Sound Bars (Elimination)

Sound bars in the picture may be eliminated when caused by adjacent channelinterference in the following manner:

I. Obtain slug -tuned reactor L-308 (adjacent channel sound trap).

2. Connect one end of L-308 to chassis ground.

3. Connect other end of L-308 through capacitor C-320 (I.Smmf) to pin no. I of the 2ndi -f amplifier (6CB6).

4. Connect capacitor C-321 (12mmf) in parallel with L-308.

5. Turn the TV receiver on and tune it accurately to the station on which the adjacentchannel interference occurs.

6. Turn L-308 to its extreme counterclockwise position; then rotate slowly clockwise untilsound bars disappear.

NOTE: The alignment of T-302 may be affected. If so, it will have to be realigned. Laterproduction chassis incorporate this change.

John F. Rider Publisher, Inr. Rider Tek-File Handy He. 7

WESTINGHOUSE MODEL H-630714CHASSIS V-2176

Circuit Changes (Deflection Yoke)

I. a. In chassis using a deflection yoke (Z-402) marked V-10045-3, the 110 ohm resistor(R-453), which is shown on the schematic shunting the width control, is omitted.This is done to obtain correct picture width.

b. In most of these chassis, the low -potential lead of the high -voltage filter capacitor(C-431, 500mmf) is connected to ground rather than to terminal 7 of the high-voltage transformer (T-402) as shown.

2. a. In chassis using a deflection yoke marked V -10045-I, resistor R-453 will be omittedin some cases for correct width.

b. In these chassis, the lead from the horizontal winding of the yoke goes to terminal 7of the high -voltage transformer (7-402), Instead of to terminal 5, as shown.

3. When it becomes necessary to replace yoke, it is recommended that an assemblybearing the same Part number is used.

m Mr F. Rider FsrNisMe I. Rider Tek-FIN IINi/ lb. N

Fig. 2. A couple of TEK-FILE HANDIES (actual size)showing two explicit type changes written up.

_ ==' vLC:.-__Li'CT.-.- ----1413'

-- ---

i - =Yaw',w-tM1.JrlLTYi.:tJ

f, w--- - ,- -

---- ..-._.-,..---- =mi- iirasr.re_-...-.._.._"rássr.a-_ _-'--: 'a:r.a.=__._._.-..-.. 1

_--._ _.__:__-_Is4R=a2cs:,. --- -------lIeaarrwerauaLaente.?r--.--...._._..-._'-ears:-rn_..-__-.- _

--._..... ------- =swam-

tl.. f------ -_ ..-----rf- =sew- lr

,.....7-.,_," .w.1_,...,_.:.--_....rsc.'-.__._-_--_ar--.__._------....1-1:..-,.,-=.,,----------- iÍLSt¢ -va2-xvaeº4r, it_rr_.r--__--.._....__

_---- .e _

--_.-._--.-iiii

--- --- It- ---m.r )-= -- r:..c.,.:r-------=yew."szr.wmesea>r__---!tLYrAiA =F -----

-SFrr-ssmy :It re_sí1i-:'F?3'a.33*+ií} I

- .--_----

Fig. 1. Layout of a typical HANDY sheetwhich is included in various

TEK-FILE packs.

we mean what the receiver manufacturerknows. Utilizing this information is the dif-ference between making every minute on thejob produce results-or wasting a lot of timeon a job and in repeat calls.

The issue at the moment is not one of profit.We take it for granted that every serceoperator does everything he can to earn aprofit. What we are talking about is a prac-tice which is followed by every engineeringoutfit which has occasion to work on electronicequipment, to develop or modify equipment tofit a need. These organizations make life easyfor themselves by first determining the knownart-and known art means information re-lating to what already has been done. Thebigger these organizations are, the more theydo this.

The tv service technician can well affordto follow the practices of electronic engineer-ing outfits. Why waste time and moneypondering and trying to locate cures for tvreceiver troubles when specific information isat hand ? It's bad enough when this has tobe done because the necessary information isnot available, but when the information isavailable-it is throwing money away not touse it.

We are referring specifically to the HAN-DIES contained in many Rider TEK-FILES,and the CHANGES in the Rider Manuals.Beginning with Volume 9, each Rider TVManual will contain the HANDIES ap-plicable to the receivers in the manual. EarlierRider TV Manuals contained these as changenotices. Rider TV Manual Volume 9 will bereleased in late April.

Several HANDIES are shown on this page.They are the equivalent of 3" x 5" cards,which can be filed in a card file. Each isidentified with a manufacturer, a receivermodel and a trouble symptom and fault-andeach card states the permanent cure asdescribed by the set manufacturer.

Examine the cards shown on this page.They are just a few of the 240 Handies which


10 Successful Servicing, March, 1952

4110A I41, 0 FOR FIXINGI

A SIMPLE THING LIKE THAT.

THERE WASAN/7

INTERMITTENTSHORT

T TOOK

3 DAYS

^ INYETOIIII'

LOCATE TI

$1099

FOR YOUR

CARTOON IDEA

Have a pet peeveabout service custom-ers and their peculi-arities? Help us keepthe above "SERVICE-MAN'S DIARY"cartoon series goingby sending in youridea. No need to drawit-just write it out.Sprague will pay$ 10.00 for every ideathat is used.

THAT'LL BE 559.2FOR MY

TIME -PLUS1259 FOR THE

PENICILLIN.WELL TRY

A COUPLE

MORE SHOTSNEXT WEEK. IF

THEY DOÑT WORKI'LL GIVE YOU

AN EXAMINATION

THE 7

Op1taNTItElEEIEts

tWEEK LATER.BUT ONESERVICEMAN CALLS ON TNE'DOC:

W+1E THE

Unequaled

DependabilityActual service records prove

that Sprague Twist-Lok dry elec-trolytic capacitors are tops for

keeping you out of trouble withservice customers-by keepingtheir TV sets working right!

And Sprague has the most com-plete listing of every type of tele-vision electrolytic. Ask yourSprague distributor for a catalog

or write to: SPRAGUE PROD-UCTS COMPANY, 55 big....-.

St., North Adams, Mass.

TWIST -LOW 'LYTICSThe easiest to use, most reliable electrolytics

for television replacement use

(A)

Fig. 1,1. Picture distortion observed whenstray -capacitance balancing capacitor across

horizontal deflection coil is too large.

(B)

Fig. 1B. Voltage across horizontal deflectioncoil displays four troughs, each corresponding

to a foldover in the picture.

Fig. 1C. Normal voltage waveform acrosshorizontal deflection cod. A certain tendencyto ring at the end of retrace appears, due to

tolerances of circuit components.* T.M. (Sprague Products Company is the Distributors' Division of the Sprague Metric Company,

Please mention Successful Scenicsng when answering advertising.


94enp2e/1.#9 Scope t/aue jo4msi TV Senuici#ir

The importance of knowing how to inter-pret waveforms seen on a service oscilloscopeis not fully appreciated by most tv service tech-nicians. There is a tieup between the pictureobserved on the screen and the oscilloscopewaveforms observed at various test pointson a chassis. Knowing how to interpret thesewaveforms will cut service time to a minimumand make for better servicing.

As an example of the relationship betweenthe picture on the tv screen and the wave-forms in the circuit, refer to Fig. 1, whichshows the picture and voltage and current

(D)Fig. 1D. Current through the horizontal de-flection coils when excessive balancing capaci-tance is used. Four troughs are displayed, asin the voltage waveform (Fig. 1B), but thewaveform details differ, due to current andvoltage association with a reactive (inductive)

circuit.

(E)

Fig. 1E. Normal sawtooth. The sawtooth issomewhat non-linear, due to nvisadjustment of

the drive and linearity controls.

by Bob Middleton

waveforms resulting from distortion intro-duced by the horizontal deflection circuit. Thevarious waveforms and the circuit conditionscausing them are described in the captions.

The shape of the sync pulse of a tv re-ceiver is closely related to picture reproduc-tion. If the picture rings, the sync pulse willalso ring. Ringing is increased as the band-width of the amplifier is narrowed and as thepicture carrier is run further down on theresponse curve. The various scope patternsreproduced in Fig. 2 show the effects of ring-ing on the picture tube as well as on thechassis waveforms.

(A)Fig. 2A. I -f amplifier bandwidth wide enoughto avoid ringing. Picture carrier is seen half-

way up curve.

(B)

Fig. 2B. Sync -pulse waveform produced byresponse curve of Fig. 2A.

11

(C)Fig. 2C. Ringing produced in test patternwhen i -f amplifier bandwidth is narrowed.

(See Fig. 2D)

(D)Fig. 2D. Narrowed i -f amplifier bandpasswhich produces ringing in test pattern, as wellas overshoot and ringing in sync pulse. Pic-ture carrier. seen very low on curve, aggra-

vates the distortion.

(E)

Fig. 2E. Distorted sync pulse produced byresponse CH M!' e of Fig. 2D. Low placement ofpicture carrier attenuates sync pulse, andcauses instability of sync action in many cases.Scope gain was advanced to obtain sufficient

height of display on screen.

I2 Successful Servicing. March. 1952

TUNG-SOL®for

Uniformityand

Dependability

REPLACEMENT:

Tung -Sol tubes keep service

standards up to set manu-facturers' specifications.

INITIAL EQUIPMENT:

Tung -Sol tubes meet thehighest performance require-

ments of set manufacturers...

TUNG-SOLRADIO, TV TUBES, DIAL LAMPS

TUNG-SOL ELECTRIC INC., NEWARK 4, N.J.Sales Offices: Atlanta Chicago Dallas Denver

Detroit los Angeles Newark

ALSO, AUTO LAMPS, ALL -GLASS SEALEDBEAM LAMPS AND SIGNAL FLASHERS

JPlease mention Successful Servicing when answering

advertising.

CIu Cad«,How does the radio and tv receiver manu-

facturer code his chassis? Some use theRTMA numbering, others use letters, num-bers, triangles, etc. This information is veryimportant to every service technician becauseit is the best means for correlating the servicedata which appears in RIDER MANUALS,TEK-FILES, and other of our literature withthe actual chassis at hand. It is especially im-portant in the association of circuit changesand trouble cures applied to different produc-tion runs of a receiver.

We are surveying the manufacturers forsuch information and shall print this data inSUCCESSFUL SERVICING. Make certainthat you keep these data on hand. File themwith your Rider Manuals or Tek-File Folders.

Alliance Mfg. Co. rubber stamps the bottomplate of their tv booster with an AB or AB -1if the booster is the original Tenna-Scope de-sign or AB -2 and AB -5 for later productionmodels.

It is the practise of the Altec Lansing Corp.to include a schematic diagram with eachtuner, and this drawing indicates the serialnumbers to which the drawing applies. Theschematic is changed every time any principalchange is made in the circuit and the identifi-caton of serial numbers is put in the lowerright-hand corner.

Any major change in circuit or mechanicaldesign which would render original drawingsobsolete, is accomplished with a change inModel No., advises the Anchor Radio Corp.Minor substitutions or changes in mechanicalparts, that still leave all components of a par-ticular unit interchangeable, are not indicatedin an original Model No. or a particular serialno. Only the individual part is so identified(A, B, C, etc.) and the replacement partsshipped will always be of the latest type.

Arvin Industries, Inc. identifies changes ofconsequence in production runs by a dash(-) number following the chassis no. Forexample, take the TE 302 chassis. On theschematics applying to the different productionruns of this chassis, changes are outlined show-ing how they differ from the preceding dashnumber. The added number (now TE 302-1)is "impressioned stamped" on the back flangeof the chassis.

Motorola, Inc. rubber stamps their chassisfor the initial runs with a plain chassis num-ber, such as TS -314. When subsequent changesare made, a letter is added behind the chassisnumber, such as TS -314A, TS -314B, etc.

The Crosley Division of the Avco Mfg.Corp. indicates major changes by a change inthe suffix number of the chassis model. Forexample, 356-1 used 17" rectangular glass pic-ture tube. When a 17" rectangular metal tubewas used, the chassis number became 356-2and when a 17" rectangular glass tube withelectrostatic focusing was used, the chassisnumber became 356-3. On minor changes, suchas changing resistor values or other changesthat affect the wiring diagram, the change is

indicated by a code letter rubber stamped onthe top of the chassis at the right-hand corneras viewed from the rear of the set.

The Fada Radio and Electric Co., Inc. iden-tifies their radio receiver models by a whitelicensee label or tube layout label. Theselabels are glued on either the bottom or insidewall of the cabinet and have the Model No.printed on them. Circuit changes are indicatedby a large alphabetical letter stamped on eitherthe Rear Chassis Apron or Loop Backing.Their tv receiver models are identified by awhite model and licensee label glued on theRear Apron of the tv chassis. Circuit changesare indicated by a large alphabetical letter(or double lettering if more than one circuitchange has been made) on the Rear Apron ofthe tv chassis. Serial numbers on both radioand tv chassis only serve to individualize thechassis.

As of January 1, 1951, the Tele -Tone RadioCarp. has been using a new system for codingtheir receiver chassis. The 7000 series of chas-sis numbers indicate tv receiver chassis with nopower transformer and the 8000 series indicatetv receivers with power transformers. Priorto this date, a letter system (TAO, TAH-UL,TAP -2 -UL, etc.) was used. The new, rubber-stamped series can be found on the rear apron

or to powerformer.

In order to indicate a major change, suchas substitution of a tube and associated cir-cuits, the Zenith Radio Corp. adds a Z, ZI,Z2 or even double Z's to their model numbers.A corresponding service note is printed andsent out to the field. These numbers woulddefinitely allow the service man to be able 'toidentify a chassis for its original design andsubsequent modifications.

Western Auto Supply's principal method ofcoding is by the use of letters following theTruetone Model No., that is, original produc-tion runs will be identified by the Model No.followed by either no letter designation or theletter "A." Any changes in design or cir-cuitory which would make service literatureas originally published no longer correct, willresult in the changing of the Model No. byadding the letter "B." An example of thiswould be as follows : 2D2052A would be theoriginal production run. 2D2052B would bea suppliance production run in which majorchanges have been incorporated. Each of thesewould have its own set of serial numbers.Minor changes in any given Model are handledby issuing a supplement to the original manual.

The method of coding used by Gamble-Skogsno, Inc., is to have the Stock No. at-tached to the base on the back of the chassis.

The initial run of a given set carries theirregular Stock No. such as 43-1000. Any sub-sequent changes in circuits or parts are desig-nated with alphabetical suffixes such as "A"for the first change, "B" for the secondchange, etc.

Successful Servicing, March, 19,52 13

The

PROFILE

Of a

Succeió/u,

Service

TJechnician

V%%7%/%/./%

RIDERTELEVISION VOLUME 8

Equivalent of 2688 pages (81,'x11) 24.00TELEVISION VOLUME 7

Equivalent of 2352 pages (8''/2x11) 24.00TELEVISION VOLUME 6

E'c .iivalent of 2320 pages (81/2x11) 24.00TELEVISION VOLUME '5

Equivalent of 2320 pages (81 x11) - 24.00TELEVISION VOLUME 4

Equivalent of 2296 pages (8 lA x11) 24.00TELEVISION VOLUME 3

Equivalent of 2032 pages '(8%x11) 24.00TELEVISION VOLUME 2

Equivalent of 1896 pages (8'/2x11) 24.00TELEVISION VOLUME 1 -

Equivalent of 2000 pages (8x11) 19.80PA EQUIPMENT VOLUME 1

2024 pages - 18.00VOLUME XXII, 1520 pages 1a.o0

VOLUME XXI, 1648 pages 21,00VOLUME XX. 1776 pages 21.00

VOLUME XIX, 2122 pages 22.50VOLUME :XVIII, 2036 pages 22.50VOLUME XVII, 1648 pages 19.80

VOLUME XVI, 768 pages 9.90VOLUME. XV, 2000 pages 22.50VOLUME XIV, 1376 pages 19.80VOLUME XIII, 1672 pages 19.80VOLUME XII, 1648 pages 19.80

VOLUME XI, 1652 pages 19.80V DLU?IE X, 1664 pages 19.80

VOLUME IX, 1672 pages 19.80VOLUME VIII, 1650 pages 19.80VOLUME VII, 1600 pages ' 19.80 -

VOLUME VI, 1240 pages 15.00

Your face is your fortunet. 4,Is your profile complete?

You should own all of these RIDER MANUALS- so vital to profitable and successful tv -radio -paservicing! If you own only a few, you're cuttingdown on your daily income. Each volume is com-plete in its entirety and does not duplicate servic-ing data published in companion volumes. Alldata is direct from the receiver manufacturers -and it's complete data, not abridged or preparedby an independent laboratory. It contains themanufacturer's knowledge about his receiver,his research in troubleshooting the set and in

finding the permanent cures for perculiarities inthe operation of his receiver ... all of this meanssuccessful servicing. It is the difference betweena temporary repair, which is troublesome - ora permanent one ar d a prestige builder. Sche-matics, chassis views, tube layouts, parts listsand values, voltages, circuit changes ... it's allin RIDER TV -AM -FM -PA MANUALS. Buy them atyour favorite parts jobber and prove to yourselfthat you can service easier, faster, and moreprofitably.

JOHN F. RIDER PUBLISHER, Inc. 480 CANAL STREET, NEW YORK 13, N. Y.

14 Successful Servicing, March, 1952

I.R.E. SHOW AT PALACE HUGE SUCCESS

The John F. Rider Booth at the I.R.E. convention,showing Rider Manuals and TEK-FILE in background.

A TTENTION! RADIO SER VICEMENTHERE ARE THOUSANDS OF OUT-MODEDRADIOS IN YOUR "BACK YARD" JUST WAITINGTO BE REPLACED ... AT YOUR SUGGESTION

Here is the custom-built AM -FM chassisthat means BIGGER PROFITS for you!

SPECIFICATIONSSupplied ready to operate, complete with tubes,antennas, speaker and all necessary hardware formounting in a table cabinet or console, includingescutcheon. Power consumption -105 watts.

Chassis Dimensions: 131/2" wide x IPA" high x 10"deep.

Carton Dimensions: (2 units) 20 x 141/2 x 1034inches.

Net Weight: 17 pounds each.Sold through your favorite parts distributor.

WRITE FOR CATALOG KD12AND NAME OF NEAREST DISTRIBUTOR.

The NEW ESPEY model 511-CFEATURES

1. AC Superheterodyne AM -FM Receiver.2. Improved Frequency Modulation Circuit, Drift

Compensated.3. 12 tubes plus rectifier and Pre -Amp rubes4. 4 dual purpose tubes.5. Treble Tone control.6. 6 -gang tuning cond7. Full -range bass tone control.8. High Fidelity AM -FM Reception.9. Automatic volume control.

10. 10 watts (max.) Push -Pull Beam Power AudioOutput.

11. 12 -inch PM speaker with Alnico V Magnet.12. Indirectly illuminated Slide Rule Dial.13. Smooth, flywheel tuning.14. Antenna for AM and folded dipole antenna

for FM Reception.15. Provision for external antennas.16. Wired for phonograph operation with switch

for crystal or reluctance pick-up.17. Multi -tap output trans., 4.8-500 ohms.18. Licensed by RCA and Hazeltine.19. Subject to RMA warranty, registered cede

symbol #174.

Makers of fine radios since 1928.

11= TEL TRalolgar 9.7000

MANUFACTURING COMPANY, INC.529 EAST 72nd STREET. NEW CORK 11 N Y

Over 27,500 members of the Institute ofRadio Engineers, including scientists, engi-neers and executives from nearly every coun-try of the world, attended the I.R.E. annualconvention from March 3-6. The forty yearold I.R.E. is the world's most influential andfastest growing organization devoted to radio,television and allied sciences.

The convention enabled over 350 companiesto exhibit and demonstrate more than tenmillion dollars worth of radio and electronicsapparatus on four floors at Grand CentralPalace. The Radio Engineers' show featuredexhibitions of special military radio equip-ment, including atomic radiation detection de-vices and guided missile trajectory plotters.Demonstrations from the countries leadingelectronics manufacturers and research lab-oratories included items ranging from small"transitory," which someday may replacevacuum tubes, to full sized television trans-mitters.

Another major feature of the I.R.E. con-vention was the extensive series of technicalsessions and forums on research, productionand design in the radio and technical fields.Over two hundred papers, covering nearlyevery phase of the radio electronics field,were presented in meetings at the Waldorf-Astoria. Color television was discussed andan emphasis given to UHF transmitters andreceivers with the description of a new, com-pact UHF receiver tuner to be assembled innew sets at the factory and a forum on newUHF antennas and experimental amplifiers.Other meetings included discussions on in-strumentation, information theory, circuitsand microwave -guides.

All in all, the convention was pretty terrific,and if an editorial note may be added, thestaff at the John F. Rider booth certainly en-joyed "meeting you at the show."

íC uI Te#fife guced TO'

.Complete alignment data

Attention TV Service Technicians!

Please bear with us a littlelonger. The publication of the TVTROUBLESHOOTING ANDREPAIR GUIDEBOOK is beingdelayed because we are making itthe most complete possible. It isa broad subject and filled withvariations. We'll be off the pressvery shortly.

Please mention Successful Servicing when answering advertising

Successful Servicing, March, 195' 15

RARE GEMS BY TRABERT & -1OEFFER. INC. - M4UBzUSSI N

Please mention Successful Servicing when answeting advertising.

lbSuccessful Servicing, March. 1952

IMPORTANT ANNOUNCEMENT TO SERVICE DEALERS!

Your used

Ham TUBES are

now worth125 to J5.25

Sylvania Tube Distributors offer trade-in allowance

on more than 40 picture tube types ... of any make.

Here's the best picture tubenews you ever heard. It's theSylvania GLASS ALLOW-ANCE PROGRAM. You canmake $2.25 to $5.25 more onevery picture tube you sell.

1.

2.

3.

4.

You also protect your reputa-tion by installing only new,fully guaranteed Sylvania Pic-ture Tubes in your customers'sets. The process is simple! Nostrings attached!

Here's all you do!Return old picture tubes to your Sylvania tube distributor.Sylvania has made it possible for him to give you a GLASS

ALLOWANCE CREDIT of from $2.25 to $5.25 per used tube

on the purchase of any new Sylvania picture tube.

Return tubes may be of ANY MAKE but must be types shown

on the suggested Sylvania Glass Allowance Price List. (See

list below.)Returned tubes must be under vacuum and free from chips,

scratches, etc.New tubes purchased need not be the same as those re-

turned. You may choose any type Sylvania has for sale.

Sylvania reserves the right tochange cash values or tubesshown on the suggested GlassAllowance Price List. SO ACTNOW. Take your used picturetubes to your Sylvania Dis-

tributor ... TODAY! For fur-ther details call your SylvaniaRepresentative or SylvaniaElectric Products Inc., GlassDepartment, Seneca Falls,New York.

LVANIA.. ..

R 4g7ES; TELEVISION PICTURE 11NES: aECiNOIdc PRODUCTS; ELECTRONICTEST MIME: FLUORESCENT TLRIES, FIXTURES. SIDN 11flD& MC OaflCE3;

üCNT PISS; MTPAMR?S; TEtEYRRIN SETS

Here's your Suggested Glass AllowancePRICE LIST

(Clip this list and keep it handy)

12KP4A $2.25 17AP4 $2.25 20CP4 $4.25

12LP4A 2.25 17BP4 2.25 20CP4A 4.25

12VP4A 2.25 17BP4A 2.25 20DP4 4.25

17BP4B 2.2520DP4A 4.25

161P4A

16KP4

16KP4A

3.253.253.25

17FP4

17FP4A

2.252.25

20FP420GP420HP4

4.254.254.25

16LP4A 3.2517HP4 2.25 20HP4A 4.25

16QP4 3.25 17JP4 2.25 20JP4 4.25

16RP4 3.25 17KP4 2.2521EP4 5.25

I6TP4 3.25 17LP4 2.25 21EP4A 5.2516UP4 3.25 17QP4 2.25 21FP4 5.2516XP4 3.25 17RP4 2.25 21FP4A 5.25

16ZP4 3.25 17SP4 2.25 21KP4 5.2521KP4A 5.25


Successful Servicing, March, 1952 l7

1. BROADCAST OPERATOR'SHANDBOOK Second Edition, by EnnesKeep up with the industry . so many newbroadcasting techniques, together with newequipment, have been developed in the pastfew years that the author of the original "bestseller" has revised and enlarged it for thisSecond Edition. H. E. Ennes, staff engineerat WIRE, Indianapolis, covers all practicaloperations in and out of the studio. Typicalchapters: You're Often a Producer Too; Studioand Control Room; Where Split Seconds Count;Remote Versus Studio Pickups; EmergencyShutdowns. Ideal for newcomers and veter-ans alike. Cloth bound with 440 pp., 226 ill.

$5.40

2. RADIO OPERATOR'S LICENSE Q AND

A MANUAL, Third Edition, by Kaufman.Revised and enlarged edition includes newElements 2, 5, 7 and revised Elements 3 and 6

plus Element 8: Ship Radar Techniques.Contains questions and answers to FCC exams,plus a thorough discussion of the subjectscovered. 734 pp. (51/2 x 81/2") 243 ill $6.60

2a. ELEMENT 8: SHIP RADAR TECH-NIQUES, available separately bound. 32 pp.(51/2 x 81/2") ill $.78

3. UNDERSTANDING VECTORS ANDPHASE IN RADIO, by Rider & Uslan.Covers scalars, vectors, vector analysis andtheir application to radio. " . an excellentbook for any engineer who has allowed hisvectors to grow rusty through lack of use!--Tele-Tech. 160 pp. (51/2 x 81/2") ill $1.89

4. FM TRANSMISSION AND RECEP-TION, Second Edition, by Rider & Uslan.Covers operating principles of wide and narrowband FM -PM transmitters. Typical chapters:Transmitters of Today; The Transmission of FMSignals; The FM Receiver. 460 pp. (51 x 81/2")

$4.95

Buy these books now atleading bookstores...or

- MAIL THIS COUPON --TODAY -=

JOHN F. RIDER Publisher, Inc.480 Canal Street, New York 13, N. Y.

Please send me hook(s) circled. I under-stand, if not satisfied, I may return them with-in 10 days for full refund.

1 2 2a 3 4

NAME

ADDRESS

CITY

ZONE STATEPlease Print

Could we dao, ow/Le?

SIMS ELECTRONIC SERVICE

Radio & Television Repairs

12A Belleview Ave. Oceanside, N. Y.

John F. Rider Publisher, Inc.480 Canal Street, Dept. SSNew York 13, New York

Gentlemen:

1 would like to take this opportunity tothank you for making SUCCESSFUL SER-VICING available to us independent servicemen. The articles are of the utmost interestto me, and the world of help.

I'd like also to congratulate you on thewonderful job you are doing for service menthrough the use of TEK-FILES. I used TEK-FILE #1 on an Admiral. It contained sucha wealth of information that I completed therepairs in one fourth the usual time. Theowner of the Admiral was so pleased thatthrough his recommendation I received sev-eral more Admirals for factory-recom-mended changes listed in TEK-FILE. NowI use TEK-FILE on every set I repair if themodel is available. I anxiously watch for thenew releases each month.

Thank you sincerely.

Respectfully,HENRY E. SIMS

Please Pardon Us . . .

Our apologies to Mr. RichardBlitzer. Through no fault of hisown, a technical error occurred inhis article, "Troubleshooting TVAFC Circuits," which ran in theMarch issue of SUCCESSFULSERVICING. Two paragraphsdealing with Fig. 1 and beginningwith "If f the horizontal oscillatorfrequency changes . . ." shouldhave read as follows:

If the horizontal oscillator frequencychanges, say it attempts to decrease,then the phase relationship between thesine waves and the stable sync pulsesalso changes. The sync pulses are nowhigher in frequency than the sine waves.This results in VI conducting moreheavily than V2. As a result, the volt-age across 121 is larger than that acrossR2. The discriminator's output is nowthe -2 volts added to the net voltagedeveloped across RI and R2. This re-sults in a smaller negative voltage be-ing applied to the grid of the controltube. Consequently, the plate currentof V4 rises. This causes a change in theamount of injected reactance so thatthe oscillator's frequency is increased.

Under opposite conditions, when theoscillator frequency tends to increase,V2 conducts more heavily than does V1.The net output voltage of the discrimi-nator is then negative. This increasesthe negative bias on the reactance tubewhich causes the oscillator frequencyto decrease.

The newest Rider TV Manual cov-ering the very latest complete, fac-tory -issued TV receivers servicingdata for all prominent manufac-turers. Make sure you get yourcopy. Order from your jobber -today!

TV8 and VoI. 2 2h Y. The largest 'I\ m,inu:.ii ''' r pub-lished by Rider. Covers the products of52 TV manufacturers. Contents includechassis views, voltages, resistance

readings, trouble-shooting test pat-terns, waveforms.complete parts listsand values pluscoverage of allmodels and circuitchanges andmuch, much more.Equivalent of 2694pp. 81/x11"...$21.

Vol. 22. Covers all AM -FM productionruns of 62 manufacturers. Contents in-clude all factory -issued servicing dataon AM -FM receivers, auto radios, re-cord changers, tuners and recorders ...plus a cumulative index for vols. 16

through 22. 1520 pp. 81/x1l" ... 818.

Make all your servicing easier-besure your Rider Manual library iscomplete. Now available. Rider TVManuals 1 through 8..01.l-' 1

Manuals up to 22.

Get them from your jobber-today!

F /OEA

(4pE PUBLISHER, INC.''`` 480 Canal St., N. Y. 13, N.Y.

I s Successful Servicing, March, 1952

by servicemen andelectronics experts . e e

as the GREATEST Improvement in Vibrators in 17 Years

to prevent formationof an insulating filmon the contacts whilethe vibrator is on theshelf.

to allow the vibratorto "breathe" when inuse. Sealed Vent -Holeautomatically openswhen the wax meltsfrom the heat gen-erated inside thevibrator.

Experts everywhere agree that this is the greatest advancement in

vibrator design in the last 17 years! That's because NOW ... withthe RADIART SEAL VENT . .. the vibrator is sealed BEFORE it is used

. and VENTED after it is put into use! The RED SEAL rubber -faced

bakelite plug prevents insulating film formation on contacts. Heat

generated when the vibrator is put into service melts the wax outof the sealed vent -hole and permits air circulation ... FOR LONGER

LIFE AND EVEN GREATER PERFORMANCE! Give your customers the

best . .. give them RADIART ... the STANDARD OF COMPARISON.

THE RADIART CORPORATION CLEVELAND 13, OHIO

VIBRATORS AUTO AERIALS TV ANTENNAS ROTATORS POWER SUPPLIESPlease mention Sucrrsshil Srs,ici'ig when answering advertising.

Successful Servicing, March, 19521'l

I/ow cvWgelisso

5pic9/77

ture

"I'm using the CBS-Hytron Easy Budget Plan, Joe. MyCBS-Hytron distributor gave it to me."

"Tell me more."al"Well, CBS-Hytron's Plan helps me sell TV picture tubesand service to many a customer who just doesn't have $50cash. Now I make sales I'd lose otherwise. My customerpays for the job painlessly a few dollars a month. Yet I getmy cash right away - and can discount my bills with mydistributor."

"Fine! How does it work, Sam?"

1111

"Simple. I introduce my customer to the finance companyauthorized by CBS-Hytron. The finance company doesthe rest. Acts as my credit department to secure meagainst losses. Takes care of all the details ... paperwork, collections, etc. My customer gets his tube and I getmy cash - at once."

"That's swell, Sam. Now I can see why you always haveplenty of working capital."

"That's right. And talk about service! This CBS-HytronEasy Budget Plan has even brought me immediate cashfrom old accounts I'd written off as bad debts. CBS-Hytron is perfectly willing, too, that my regular budgetloans include my service work and other componentsbesides CBS-Hytron tubes. I owe my CBS-Hytron distrib-utor a vote of thanks for letting me in on this wonderfulPlan."

"Fair enough! I've sure been losing sales I shouldn't,Sam. I need the CBS-Hytron Easy Budget Plan. CBS-Hytron tubes are tops, too. Thanks for the tip. I'll seemy CBS-Hytron distributor today."

ANOTHERSERVICE FOR

YOU

NEFu SER S.Z.ZveES

\V0.E0.S°F 0.EGE\v\ O

SAVE THE SALE No need for you to miss a singleprofitable picture -tube sale ... just because your cus-tomer does not have the cash. Get the details on thisoriginal CBS-Hytron service for you. See your CBS-Hytron jobber ... or write us ... today!

FROM ' Focaomòs `.

ppV EÈ óPpGPSt\N° sQAO\a oF o`Me

p\V\S YTRORADIO TVYIi

MAIN OFFICE: SALEM, MASSACHUSETTS


20Successful Servicing, March, 1952

HOW TO FIX YOUR OWN TELEVISION SET

We know of no better way of indicating the status of home TV service by the set owner than this cartoon by Dowling ofthe N. Y. Herald Tribune. It appeared in the aforementioned newspaper. We think it's terrific !

I BOUGHT ONE OF THOSE 8.00KscN HOW TO FIX OUR OWN TELEVISIONAND SAVE COSTLY REPAIRS;

ITS SIMPLE ELECTRONICSJUST FOLLOW THE TABLE. OF

TROUBLES AND REMEDIES!

1-. -

, _,

.

4-0, Z./

y WILL YoU GET, AN ELECTRICAL_ , SHOCK?7 T

i V;;;\>----. 's ..40

LETS TRY ADJUSTMENT 10 IT SAID NOT TO REST THECHAPTER 4 - - -THE VERTICAL OSCILLATOR; You HAVE

-ro TAKE THE \ METAL PART OF THE SCREW\, \ , DRIVER AGAINST THE

BOX ouT !-- V\,, TUBE CAPS, ';

.- ca -a- as-

__1\_. - -VI

NO, YOUIT PROBABLYN6ED5 WITH THE

CLEANING ; NOT

BLOW THE DUSTVACUUM CLEANER-

SUCK IT OUT !-

IM LOOKING FORTHE SPRING SCREW

OF THE SOUND C-IIr

( I

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j

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1111Illk i<9 NI ,

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OUP ON THE\ROOF I, g //IT MAY ll-_ -THE ANTENNA ;/ /I® i REP

(7'

opyright, I95Z, .New York l7erata i rtbtne nc.


FRANK 1. MOCH,president of theNational Alliance of Television andElectronics Service Associations.

like the'NEW

new and completely advanced type of oscillo-scope-Model 476 MIRROSCOPE-is designed to eliminate certain inherentdisadvantages found in the conventional type of oscilloscope by use of the"Microscope principle." In this kind of construction the 5 -inch cathode ray

tube is mounted in a vertical position, thus reducing bench space require-

ments to an area of only 9" x 8" thereby permitting better concentration ofassociated equipment for any type of test procedure. The cathode ray image

is reflected from an optical type front surfaced mirror mounted in the ad-justable cover at the top of the cabinet bringing the viewing surface ofinstrument near eye level when instrument is used on benches of normalheight. The mirror angle is quickly and easily adjusted to any position ofthe operator. The cover with integral side wings forms an effective shieldagainst external light sources or may be closed down for protection of thetube and mirror when the instrument is not in use. The upright constructionpermits location of controls and connections for maximum convenience and

allows for internal cathode ray tube connections at the front of the panelinstead of the rear.

SENSITIVITY: INPUT IMPEDANCE:

Vertical direct 12 volts rms per in. Vertical direct 10 megohms, 15 mmf.

Vertical amplifier.20 millivolts rms per in. Horizontal direct 10 megohms, 15 mmf.

Horizontal direct 14 volts rms per in. Vertical amplifier.300,000 ohms, 30 mmf.

Horizontal Horizontalamplifier 38 millivolts rms per in. amplifier 500,000 ohms, 15 mmf.

Horizontal trace expansion is over 4 times tube diameter. This makes itpossible to examine minute portions of a response pattern for finer detail.

Linear Sweep frequency is continuously adjustable in five overlappingranges from 15 cycles to 60,000 cycles. Internal, external or line frequencysynchronization with variable amplitude is available.

Means for intensity or "Z axis" modulation is provided. Approximately14 volts peak will blank a trace of normal intensity.

The vertical amplifier frequency response is within 3 DB from 20 cyclesto over 300,000 cycles and is usable to well over three megacycles. Square

wave slant and over -shoot is held to less than 5 per cent of amplitude. Thisresponse will be found adequate for all phases of television receiver serviceincluding observation and diagnosis of Sync. signals.

TUBE COMPLEMENT:

5UP4 Cathode Ray Tube.

1-12AU7 Vertical pre -amplifier.

1-6.16 Linear Sweep oscillator andSync. injector.

2-6X4 High voltage rectifiers.

LINE VOLTAGE: 105-125 volts, 50-60cycles.

SIZE: Height 161/4"; Width 91/s"; Depth8" over all

WEIGHT, 25 lbs.; Shipping weight 30lbs.

Hight Frequency Crystal Probe...$7.50

DEALERS NET PRICE includingoperators manual $179.50

BURTON BROWNE ADVERTISING

MODEL 476

athTmirrrt>`sc:ope

CATXODL RAYOSCILLOSCOPt

>roMx.SYNC. MOW

a

MOM #76

MNDi IN USA It iWYSu+e . BttG1RtC Er2 <_

SIMPSON ELECTRIC COMPANY5200 W. Kinzie St., Chicago 44, Ill.Phone: Columbus 1-1221In Canada:Bach -Simpson ltd., London, Ontario


22 Successful Servicing, 111 arch, 1952

ENCYCLOPEDIA on CATHODE-

RAY OSCILLOSCOPES and

THEIR USES

by Rider and Uslan1. The most complete source of practical, usableknowledge concerning the oscilloscope everpublished. Covers practically every kind of'scope manufactured during the past ten years.Hundreds of pages alone are devoted to actualapplication plus complete, detailed treatmentsof auxiliary equipment, measurements, wave-forms, visual alignment of AM -FM -TV receiversand more, much more. A "must" for anyoneusing an oscilloscope. Completely indexed, with992 pages (81/2 x 11") 3,000 illustrations $9.00

2. VACUUMTUBE VOLTMETERS, by Rider & Barber.Completely revised. Covers theory, functions, opera-tion and applications of the VTVM in detail. Typicalchapters: Triode Vacuum -Tube Voltmeters; Probesfor DC & RF; Calibration and Testing. 432 pp. (51/2 x8th") III $4.50

3..TV AND OTHER RECEIVING ANTENNAS, by Bailey,Is a source book on antennas of all types. Typicalchapters: The Center Fed Zero DB Half -Wave Antenna;Parasitic Erement Antennas; The TV Signal and ItsBandwidth; Vertically Polarized Antennas. 606 pp.(51/2 x Ph") III $6.00

4. TV INSTALLATION TECHNIQUES, by Marshall. Apractical timely "how -to -do -it" book on antennainstallation and receiver adjustment. Typical chap-ters: Materials and Methods Used in Installations,High Mast and Tower Installations; Municipal Regu-lations Governing TV installations. 336 pp. (51/2 x81/2") 270 ill $3.60

5. TV MASTER ANTENNA SYSTEMS, by Kamen & Dorf,covers all popular distribution systems now in manu-facture, with schematics, performance figures anddesign data. Typical chapters: Installing MasterAntenna Systems; Basic TV Antenna Systems; TheNeed for Master Systems. 356 pp. (51/2 x 81h") III.

$5.00

6. RECEIVING TUBE SUBSTITUTION GUIDE BOOK,by Middleton. Lists 2,500 radio, TV and electronictube- substitutions in numerical sequence for quickreference. Gives performance ratings and any neces-sary wiring changes. Also RTMA color codes, trans-former and condenser substitutions. 225 pp. (81 x11") $2.40

6o. FIRST SUPPLEMENT TO ORIGINAL GUIDE BOOKlists 650 completely new and different tube substitu-tions. Includes wiring instructions and illustrationsof original and substitute tube sockets. 48 pp (81/2x 11") $.99

Buy these books now at your jobbers...leading bookstores...or -

JOHN F. RIDER, Publisher, Inc.480 Canal Street, New York 13, N. Y.

Please send me books) circled. I understand,if not satisfied, I may return them within 10days for full refund.

1 2 3 4 5 6 6a

NAME

ADDRESS

THIS COUPON-TODAY.

CITY_ ZONE-_STATE_(Please Print) SS-

ASS®CIATI®N\ Ih; W S

The recent huge success of the first twomeetings of the Elmira Television DealersAssociation has prompted a local group ofservicemen to start a similar and parallelorganization devoted to television and radioservicing. It has been over ten years sincesuch an organization existed in this city.' Inthe not too distant past, The Relay tried tosimulate interest in such a club but was un-successful. It appears, however, that the ser-vicemen are now becoming aware of the im-portance and even the necessity of such anorganization.

The first meeting will be limited to service-men and service shop operators of Elmira,Elmira Heights, Horseheads and the imme-diate area around these three cities. This isonly temporary and it is expected that as soonas an operating policy and meeting nights,etc. are agreed upon, all servicemen in thearea served by The Relay will be invited tomembership. It is to be emphasized that thisgroup is meeting to decide on the future ofsuch an organization, its policies, and itspossible advantages. If this meeting is suc-cessful and an organization is decided upon,it is probable that meetings will be held atleast once a month.

In his new job as RTMA service manager,Albert Coumont will coordinate the associ-ation's activities "aimed at improving industrypractices and policies on TV servicing." Cou-mont brings twenty years experience in theradio and tv field to his new duties : he's ownedhis own home radio repair company and par-ticipated in home radio service divisions of setmanufacturers. Coumont comes to RTMAfrom a sales manager position at G.E.; hisfirst project for RTMA will be to promotetraining courses for service technicians in thenation's trade schools.

In the South, the Radio and TV Techni-cians Guild of Central Texas has elected newofficers. Marvin F. Hoffman is President,Leslie Fields, V.P. and "Doc" Oliver, secre-tary -treasurer. This guild assists the servicetechnician in his business management and inexchanging information. It has also voted tomaintain a credit similar to that of merchantsassociations. All dealers and servicemen inCentral Texas are invited.

From the West Coast comes word that theSociety of Radio and Television TechniciansInc. has formed a new technicians group inthe Fernando Valley. Twice -monthly meet-ings are aimed directly at the active techni-cian, with discussions on both his business andtechnical practices. However, jobbers, sales-men and apprentices are welcome as associatemembers.

In the mid -Nest. the Chicago City Councilis discussing the writing of a licensing law forservice men and companies. TISA of Illinoishas offered its knowledge on the matter andwill take whatever action necessary to servethe interests of the service industry best.

At Elkhart, Indiana, Floyd J. Hutchison,of the Chamber of Commerce, saved the citythe expense and trouble of monitoring tvantenna installations by taking action to theorganized local dealers and service men underthe "Certified TV installation and ServiceProgram" initiated by NARDA. Hutchisonsecured the city's agreement to hold the pro-posed licensing measure in abeyance until thedealer organization could present a counterplan to have the dealers themselves policeinstallations.

The Associated Radio and Television Ser-vice Dealers of Columbus, Ohio report thatappliance dealers in that area are turning all


SO IMPORTANT- it wasFeatured in Special Articlein

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I1l'Vt1 CR TUBE

TESTER - REACTIVATORperforms 2 vital functions:

Tests Picture Tubes Renews Brightness of Many

Dim Picture Tubes

It's a TESTER:Without removing picture tube front set, you applythis precise instrument to:-

Measure Cathode emission Locate shorts between elements Locate high resistance shorts or leakage

as high as 3 megohnu

It's a REACTIVATORfor dim CR Picture Tubes

Revives dim TV Picture Tubes, without removal oftubes from sets. Works on a great many tubes withlow light output, if there's no mechanical defect intube. 110 V-60 cycles. Portable, weighs only 3lbs One or two applications pays for instrument.

SATISFACTION GUARANTEEDor money refunded if you return 95the instrument in 10 days in good NETcondition.

------RUSH THIS COUPON -----fTRANSVISION, INC.

DEPT. SS3 NEW ROCHELLE, N. Y.( ) Send me-CR Tube Tester-Reactivator(s).( ) Enclosed find $_ deposit. Balance C.O.D.( ) Enclosed find $ in full. Send prepaid.

Name

Address-

) Cify - - - State_

Pleasemention Successful Servicing when answeringadvertising.


N

M''REPORTS

'A monthly summary of product de-velopments and price changes ofradio, electronic, and television partsand equipment, supplied by UnitedCatalog Publishers, Inc., New YorkCity, publishers of RADIO'S MAS-TER.These REPORTS will help you tobuy and sell to best advantage. Theywill also help you to keep your in-ventory up to date. A complete de-scription of most products will befound in the Official Buying Guide,RADIO'S MASTER, availablethrough local parts distributors.

New ItemsASTATIC CORP.-Introduced Carbon Hand Micro-

phone Model 10M5 at $17.70 net.CHANNEL MASTER-Added 14 new models to their

line of Television Antennas and Accessories.DUOTONE CO. --36 new Diamond Replacement

Needles added.EDITORS & ENGINEERS-"World's Radio Tubes,"

9th Edition now available.ELECTRONIC MEASUREMENTS CORP.-Models

205 and 205P Tube Testers and HVP, High VoltageProbe added.

ELECTRONIC TRANSFORMER CO.-Added 4

new items to their line of Step -Down Auto Trans-formers.

JENSEN INDUSTRIES-Added 6 new "Jensen"Replacement Needles (Shure Bros.) for Standard,All Purpose and Micro -Groove. Also added Jensencutting needles No. WG-65, Wilcox Gay (Stellite)cutter playback combination for 78 RPM records. . . and WG-652, Wilcox Gay (Stellite) cutterplayback combination for 33-1/3, 45, and 78 RPMrecords.

J F D-Added 2 Indoor Antennas ... 7 ZoomupMasts . . . 3 Screw Eye Standoffs #NUT 350-550.750 . . . Screw Eye Standoff Insulators#DNUT 350.550-750 . . . Pre -Amplifying CouplerEC4 and Open Line Wire Lead In OL-100 andOL-250.

OXFORD ELECTRIC-Added 16 new items to theirline of Loudspeakers.

PERMOFLUX-Added 3 new Speakers, #4CM and45CM to their "Champion" line and 15WP-8.1 totheir "Royal" line.

PRESTO RECORDING-Added #CS -10 at $52.00

net to their line of Recording Equipment.RADIART CORP.-Lightning Arrestors TA -5 -DP

and TA-5WS added at $.75 and $.81 net ... addedYagi 4YG45 for Channels 4 and 5.

R. C. A.-21 Electron Tubes and 4 Kinescopes added.RECOTON CORP.-Recoton Replacement Phoneedle

Kits #150 and 550 added . . . also 11 "Recoton"Replacement Needles.

RIDER, JOHN F.-TEK-FILE Packs 49 thru 56available at jobbers this month ($2.00 per pack).

SHELDON ELECTRIC-Added TV Tubes 16AP4Aand 21KP4A to their Blue Label and White Labelseries.

TELREX INC.-Added t4 wave and t/_. wave Trans-mission Line Coupler and E -Z Rig "Clover -V -Beam." Also TVB-1 and TVB-2, Telrex "V -Beam"w/Hi-V Reflector, and "Hi-VReflector" Adapteradded to their line of "ConicalV-Beams."

THORDAR'SON-MEISSNER-23 TV ReplacementCoils added.

TRIPLETT-Introduced Model 650 at $69.50 net totheir series of Test Equipment.

VACO PRODUCTS-Added Lynn Lightning Solder -

less Terminals #2600 at $1.00 net per pack of 50and #3300 at $1.00 net per pack of 50.

VAN CLEEF-Added line of Dutch Brand Rubber

Bonding Cement . . . Dutch Brand Rub'r Shimand Dutch Brand .010 Plastic Electrical Tape.

Discontinued ItemsAMPHENOI. -Withdrew 4 Steatite "CP" Type

Plugs 49-245, 255, 265, and 285 . . . also packaged300 Ohm Twin Lead #184-803 and 184-804.

CHANNEL MASTER-Withdrew 7 models fromtheir line of Television Antennas and Accessories.

E. F. JOHNSON CO.-Temporarily discontinued 97

items on their line of Radio -Electronics Products.OXFORD ELECTRIC-Withdrew 15 items from

their line of Loudspeakers.PERMOFLUX-Withdrew 17 Permoflux Speakers.RAM ELECTRONICS-Withdrew X052 and X055

Horizontal Output Transformers.T -V PRODUCTS CO.-Withdrew MJ-1, Mast Joiner

Mount and RM-5, Roof Mount.UTICA DROP FORGE-Tools #43.5", Wire Strip-

ping Diagonal Cutting Pliers . . . 49-5", PlasticCutting End Nippers . . . 52-7", Side CuttingPliers ... 26-7", End Cutting Nippers withdrawn.

Price IncreasesifEAM INSTRUMENT CO.-Increased prices on

Loading Casettes and Receiving Casettes in theirseries of Cossor Oscillographs and Accessories.

ELECTRO-VOICE-Increased prices on 24 items ontheir line of Mikes, Phonograph Pickups andCartridges.

GARRARD SALES CORP.-5 items on their lineof Record Playing Equipment increased.

KENYON TRANSFORMER-Revised their entireprice line up in accordance with CPR 22 Sup. Reg.17.

KESTER SOLDER CO.-Increased prices on 1 lb.,

5 lb., and 20 lb., spools of Rosin Core, Acid Core

and "Resin -Five" core Solder Spools.PERMOFLUX-Increased prices on Monaural head-

sets #DHS-1B, DHS-15B, DHS-17B and DHS-28B.R. C. A.-52 Electron Tubes and 191 Receiving

Tubes increased.RAYTHEON -15 Special Purpose tubes increased

"due to higher material and manufacturing costs."RIDER, JOHN F.-Increased price on "FM Trans-

mission and Reception" to $4.95, March 1st.April 1st increases:"'1'V Installation Techniques" to be $4.50;"TV and Other Receiving Antennas" to be $6.60;"Receiving Tube Substitution Guide Hook" to he$3.00.

SHELDON ELECTRIC-Increased prices on TVTubes 19AP4A, 19A1'4B and 19AP4D in their BlueLabel and White Label series.

SYLVANIA-51 Receiving tubes increased in price.WINCHARGER CORP.-Ltcreased price of Roof

Mount Towers 15805 to $8.95 net and 15810 to $17.90net.

Price DecreasesELECTRONICS, INC.-Decreased prices on 26 items

on their line of Rectifier Tubes and Grid ControlRectifiers (Thyratrons).

ELECTRO -VOICE -22 items on their line of Mikes,Phonograph Pickups and Cartridges have beendecreased in price.

GARRARD SALES CORP.-Decreased prices on#RC80-C and RC80DC on their line of RecordPlaying Equipment.

G. E.-Two 10" TV Tubes, two 12" TV Tubes andtwo 16" TV Tubes decreased in price.

PERMOFLUX-14 Speakers on their line decreasedin price.

PHILSON MFG. CO.-Decreased prices on #101,102 and TWM 4 in their line of antennas.

PRECISE DEVELOPMENT CORP. - Reduced#999-R to $2.80 net on their line of ElectronicTest Equipment.

R. C. A.-19 Receiving Tubes, 8 Electron Tubes and13 Kinescopes reduced in price.

RECOTON CORP.-Decreased prices on 4 "Recoton"Replacement Needles #305, 6, 7, and 10.

SARKES TARZIAN-Reduced prices approximately20% on Universal Replacement Tuners TT5R21 andTT5R41.

SHELDON ELECTRIC-Decreased prices on 4 TVPicture Tubes in their Blue Label series, and 5TV Picture Tubes in their White Label series.

. . also price of Microphone Replacement Cart -Cartridge (carbon) #101C and 102C to $16.50 net

. . also price of Microphone Replacement cart-ridge (carbon) #R10 to $4.80 net.

SOl.:\ ELECTR1C-Added quantity discount for 5and up on 31 items on their line of Constant Volt-age Transformers.

SYLVANIA-Decreased prices on 7 SubminiatureTubes, 7 Radio Receiving Tubes and Special Pur-pose Tubes OW and 6X5WGT.

TRIO MFG. CO.-Towers 101 -A -B and 101-CUC re-duced to $7.50 net.

UTICA DROP FORGE -91 Series of AdjustableWrenches (7 Wrenches) reduced approximately5% list.

VIBRALOC CORP.-Decreased prices on 8 itemson their line of Loudspeaker Baffles.

Miscellaneous Changes

SYLVANIA--Announced that 41 TV Tubes are nowsubject to Dealer Glass Allowance on purchases ofnew Sylvania TV Tubes.

Coming. in_ Ciphil . . .

RIDER TV MANUAL

VOLUME 9

63,500There are 63,500 references to pertinentelectronic and allied engineering articlespublished from 1925 through 1949 in thefive editions of the

ELECTRONIC ENGINEERING

MASTER INDEX

1925-1945 edition-(15,000 entries)


1946 edition-(7,500 entries)


1949 edition-(12,500 entries) __ $17.50

$17.50

$10.00

$14.50

$19.50

Electronics ResearchPublishin g Company,lnc.

Dept. 55 480 Canal St., New York 1 3, N. Y.

24

-the ceramic with themillion dollar body!

Never before such uniformity, such dependability inceramic capacitors! TINY MIKE is C -D through andthrough. Even the ceramic body is made by C -D, in itsbrand new ceramic body plant, electronically controlledat every stage!

yp00>.,.--------`

4101

1910.1952 SUBSiOi"Y

O N S I S T E N T L Y E P E N D A B L E

CORNELL- DO BILlERCAPACITORS

Plants in South Plainfield, N. J., New Bedford, Worcester and Cambridge, Mass.; Providence, R. I.; Indianapolis,Indiana; fuquay Springs, North Carolina, and subsidiary, The Radiart Corporation, Cleveland, Ohio.Please mention Successful Servicing when answering advertising.

RIDER TV TEK-FILE PACKS 1-48

Now Available At Your Jobber!(If Not - Call or Write to Us Directly)


TV versus Radio Repair(Continued from page 9)

have been released in Rider TEK-FILEPACKS 1-48. Thousands more are coming.Wouldn't it be a horrible waste of time, moneyand effort to ponder and experiment in anattempt to cure these faults when you run intothem in these receivers? All you have todo is to get the proper TEK-FILE or RiderManual, and these examples of known artare ready to serve you. They'll make yourwhole servicing job easier-they'll make yourwhole day better.

TEK-FILE HAN.DIES reflect what thereceiver manufacturer has learned abouttroubles in his receiver. It is the kind ofknown art which helps the man who is notthoroughly familiar with tv receiver design.It is the kind of known art which saves hoursof effort and aggravation. It is the differencebetween making a TV receiver repair jobtemporary and troublesome-or making therepair permanent, and a prestige builder.

Make Rider Manuals and TEK-FILESyour background, your technical know-how.They'll serve you day after day, month aftermonth, and year after year-and with exactlythe same information as the receiver manu-facturer uses in his own plant and in the shopsof his distributors.

Association News(Continued from page 22)

their "retail" service calls over to ARTSDmembers with good results.

On its second anniversary, the Radio and7'V Technicians Guild of Florida was unani-mously accepted into the NETDSA thismonth.

NETSDA itself, at its regular monthlymeeting in Harrisburg, acted upon the matterof its own incorporation, moving to make anapplication as a non-profit corporation withthe State of N. Y. National Headquarters ofthe association have been moved from Wash-ington to New York City. At the annualelection of officers, Max Liebowitz was re-elected president and Roger Haines V.P. Atan earlier meeting, in Philadelphia, a reportwas made on the progress of Radio -TVLicensing in New York City and the Stateof Pennsylvania.

Have you written your Congressmen ex-pressing your opposition to House Bill# HR 6219? This bill would require all elec-trical appliance manufacturers to include arepair booklet with each sale of a radio or tvset. Such a bill would license all set ownersto attempt to repair their own receivers; itwould endanger set value by causing thegeneral public to attempt repair withoutqualification; it would cause untold loss todealers selling sets on time to tamperingcustomers. For the set owner, radio andTV receivers are conveniences to be en-joyed, not jig -saw puzzles to be played with.

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Documents

HORIZONTAL OUTPUT TRANSFORMERS · important replaceable parts of a tv receiver. The series will discuss the following topics 1. use and replacement of horizontal out-put transformers