The Radiart Corp.

Cleveland, Ohio, Plants

asn

pp."i$E:ti¢'iMºvtfáér

'apFa1lil°1111Rp114HIR

C -D Fuquay Springs Division, N. C.

C -D Providence, R. I., Plant

C -D South Plaintleld, N. J., Plant

Itttit r

tN811t0 Eig39c..- C-D Worcester, Mass., PlantC -D New Bedford, Mass., Plant C -D Cambridge, Mass., Plant

C -D Indianapolis, Ind., Plant

Vol. 18 DECEMBER, 1953 No. 12CORNELL-DUBILIER ELECTRIC CORP.Hamilton Boulevard, South Plainfield, N. J.POSTMASTER: If undeliverable for any reason,notify stating reason, on Form 3547 postage for

which is guaranteed.

MR MARSHALL W COLER R 1 BOX 257FORTVILLE IND

Sec. 34.66 P.L.&R.U. S. POSTAGE

PAIDSo. Plainfield, N. J.

Permit No. 1

Sealed against heaf,humidifyl

NOW AVAILABLE ESPECIALLY FOR SERVICEMENNow you can get the identical C -Dcompact size metal -cased tubularelectrolytic capacitors that havebeen used by the millions for thepast three years by the originalequipment manufacturers. Dual -Triple and Quadruple section units.

Direct -to -terminal internal lead construc-tion reduces possibility of shorts. (Purealuminum wires crimped securely togetherwith outer leads within aluminum studterminals.)

New high -insulation vinylite coveredleads.

Sections sealed in aluminum tube for pro-tection against moisture getting in, orelectrolyte drying out.

Wax impregnated cardboard outer insu-lation sleeve.

Rubber diaphragm -type vent insuresideal vent action under all conditions.

Ideal for operation at temperatures upto 85°C.

Examine and compare them todayat your Cornell-Dubilier Distributor.He's listed in Yellow Pages of your'Phone Book. Cornell-Dubilier Elec-tric Corporation, So. Plainfield, N. J.

CORNCORNELL-DUBILIERWorld's Largest Manufacturer of Capacitors.

PLANTS IN SO. PLAINFIELD, N. J.. SANFORD AND FUQUA? SPRINGS. N. C. PROVIDENCE. R. I., INDIANAPOLIS.

IND. NEW BEDFORD. WORCESTER AND CAMBRIDGE. MASS.. SUBSIDIARY: RADIANT CORP., CLEVELAND. OHIO J

SIMPLE SIGNAL INJECTORSThe signal - injection method of

troubleshooting is rapid and simple.It may be applied to receivers andsound systems with equal facility.While somewhat similar to signaltracing, it has an important point ofdifference: In signal injection, the testsignal is introduced at various pointsinto the system under test, starting atthe output and working back pro-gressively to the input. The stationaryoutput device (loudspeaker or outputmeter) indicates transmission or lossof the signal, and thus alerts the oper-ator to the position of dead stages.A defective stage thus can be isolatedquickly and static tests then under-taken to find the defective componentsresponsible for the trouble.

A signal source usually is the onlyaccessory required for signal -injectiontroubleshooting. Audio and r. f. oscil-lators often are used. This raises thenatural question why build a specialinjector when oscillators are standardequipment? The answer is that oscil-lators and signal generators often arenot conveniently transportable to out-side jobs. Since signal injection gener-ally requires only a single spot fre-quency, accurate variable - frequencyoscillators may be left in the labo-ratory or shop. Simple signal injectorscan be made small enough to becarried in the pocket, and when tran-sistorized, may even be constructedcompletely in a probe.

Signal injectors have taken manyingenious forms. Some have beendesigned for special purposes and haveonly limited application in generalservicing. This article describes sev-eral simple injector circuits which canbe made the basis of inexpensive in-struments that the service techniciancan build.

Neither of the circuits is critical.They have been made as foolproof aspossible and have been thoroughlytested in the author's laboratory. Be-cause they are not critical, the readeris free to satisfy his own preferencesregarding layout and packaging.

Audio InjectorsFigures 1, 2, and 3 show injector

circuits for use in checking audioamplifiers and the audio channels ofreceivers and transmitters.Low -Voltage Battery -Tube Type. Fig-ure 1 (A) is a tickler -feedback -typeoscillator arranged for economical low -voltage battery operation. The Bbattery is a 41/2 -volt unit and canbe one of the small, flat-type unitsmarketed as C batteries. This oscil-lator lends itself readily to small -sized construction.

The feedback transformer can beany available interstage unit havinga turns ratio of 2:1 or 3:1. The low -impedance winding is connected tothe plate of the 1LE3 tube, and thehigh -impedance winding to the grid.The oscillation frequency is determinedby the capacitance of C and the in-ductance of the grid winding of thetransformer. Various values of Cmay be tried experimentally to obtaina satisfactory tone frequency. Thelower the capacitance, the higher willbe the frequency.

The transformer windings must bephased properly for positive feedback.If oscillation is not obtained when theON -OFF switch is closed, reverse theleads of the plate winding.

Only the filament battery needs tobe switched, since no current is drawnfrom the B battery when die filamentis cold.

The output attenuator is a 2000ohm wirewound potentiometer. A0.01-ufd. mica capacitor in series withthe upper output terminal isolates thetest circuit from the 1LE3 plate volt-age, and also prevents short-circuit ofthe test circuit by the output poten-tiometer.AC -Operated Tube Type. Figure 1

(B) shows an a. c. - operated single -frequency audio oscillator and iso-lating output amplifier. The left halfof the 12AT7 tube operates as a phase -shift oscillator; the right half as anadjustable -gain voltage amplifier withunbypassed cathode for degeneration.

DECEMBER, 1953 Page 3

INTERSTAGE AUDIOTRANSFORMER

( 2:1 or 3:1 Ratio

9

Low-impedance

winding

.-

b Fo High-

mpedance Twindrng +II

-r11/2v.

1LE32000

OHMS,Wire -wound

ON -OFF

(A) LOW -VOLTAGE BATTERY TYPE

C1

0.001 MFD.

0.001MFD.

R1

90K R

90K

0.001M F0.

R290K

50K

8 MFD.25 V.

y

OUTPUTCONTROL

0.01MFD.

A.F.OUTPUT

o 0 +

ON -OFF 200300 V. O.C.

T:a

500 OHMS

(B) A.C.- OPERATED TYPE

6.3 V.1200OHMS

0.1MEO.400 V.

O

A.F.

OUTPUT

OUTPUTCONTROL

500 K

All resistors /2 wait.C1,C2,C3iR1,R2 and R3 select-ed for 1000 -cycle operation

Figure 1.

The phase -shift feedback networkhas three cascaded sections (CIRI,CGR2, and CaRa). Each section provides60 degrees of phase shift. The valuesof capacitances and resistances in thisnetwork have been chosen for a fre-quency of 1000 cycles. Other fre-quencies may be obtained by changingthe values, taking care to keep thethree resistances equal and the threecapacitances equal. A practical dis-cussion of phase -shift networks and

calculations of their R and C valuesappears in "Practical R -C Circuits" inthe November 1951 issue of the C -D.CAPACITOR.

The OUTPUT control operates byvarying the signal voltage at the gridof the output amplifier. The outputcircuit is high impedance and accord-ingly operates most efficiently intohigh -impedance devices. Ample output -signal voltage is present, however, sothat good injection -signal amplitude

Page 4 THE C -D CAPACITOR

is obtained even under the unfavorablemismatch conditions of operating intoa low impedance.

A 200- to 300 -volt d. c. supply isspecified, although the circuit willoperate well at 100 volts on the platesof the 12AT7. This must be a trans-former -type supply, not the line -oper-ated (AC -DC) variety. The powersection may be built on the samechassis as the injection unit. A small -sized power transformer and miniaturecircuit components may be used forcompact, lightweight construction. Thepower supply is entirely conventional,and the reader can use any suitablecomponents he has available..

Midget Transistorized Type. Transis-torized injection circuits provide bothsmall size and economical single -battery operation. This insures theacme of portability and complete iso-lation from the power line. Presenttransistors are entirely practical inthis application and their expectedlong life more than offsets present cost.

Figure 2(A) is the circuit of asmall -sized, single -frequency transistoraudio oscillator. A CK722 junctiontransistor operates in a grounded -emitter circuit. Tickler feedback isemployed between collector and basethrough the transformer. This lattercomponent is a microphone trans -

P

B o

U.T.C.ic-Type S-7 1.0 MFD.

CK 722B

M

OUTPUTCONTROL

Rx

0.01/MFD.\

500,000 OHMS

(A) SMALL -SIZED MODEL

3V.

ON -OFF

oA.F. OUTPUT

0.01 MFD.

C

CK 722r--Low-impedonce

e . -- winding

High- _.impedance

winding100

OHMS A.F.OUTPUT

1 /p V. OU.T.C.

Type S 503-ier 0ON -OFF

(B) SUBMINIATURE MODEL

Figure 2,

DECEMBER, 1953 Page 5

former (U. T. C. Type S7) havingthree windings. The third windingconveniently is available for inductiveoutput coupling.

No warmup time is required withthe transistor oscillator. Operationstarts with the closing of the ON -OFF switch. Transformer windingsP -B and M -M must be phased cor-rectly for positive feedback or oscil-lation will not be obtained. If thecircuit does not oscillate when theswitch is closed, reverse the connec-tions to the P -B winding. The oscil-lation frequency is determined by thevalues of capacitance Ca and the in-ductance of the M -M winding of thetransformer. The frequency will de-crease as C: is increased. No value isspecified for Cx, since we do not knowwhat tolerance will be encounteredin inductance of the transformerwinding. The reader can experimentwith various capacitances until adesirable tone frequency is obtained.

The value of the base resistance, R.,varies with individual transistors andits correct final value must be de-termined by experiment with the par-ticular transistor used It should bein the vicinity of 100,000 ohms butcan be higher or lower. Its value iscorrect when the d. c. collector currentis between 1/10 and 1/2 milliampere.

The sole voltage supply is the 3 -

volt battery, which for compactnessand portability can be two penlightcells connected in series. It is inter-esting to note that the circuits inFigures 2(A) and 2(B) will oscil-late, but with reduced output, withd. c. supply voltages as low as a fewmillivolts.

Adjustable output at high impedanceis obtained from the 500,000 -ohmOUTPUT control. The 0.01-ufd.coupling capacitor provides d. c. iso-lation for protection of both the in-jector and the circuit under test.Subminiature Transistorized Type. InFigure 2(B), the transistor oscillatorcircuit is similar to the one shown inFigure 2(A), except that a submini-ature hearing aid transformer (U. T.C. Type SS03) is used. This lattercomponent and the 11/2 -volt source

(a single penlight cell) permit drasticreduction of instrument size. Becausethe SSO3 transformer has only twowindings, audio output is taken ca-pacitively from the collector circuitof the CK722 transistor.

D. C. isolation in the output circuitis provided by the 0.01-ufd. couplingcapacitor. If the reader desires, a100 - ohm subminiature wirewoundpotentiometer can be used in placeof the fixed resistor shown, for adjust-able output. The ends of the poten-tiometer winding would be connectedas shown for the 100 -ohm resistor, andthe slider would be connected to the0.01-ufd. output capacitor.

The circuit oscillates readily whenthe ON -OFF switch is closed, nowarmup time being required, providedthe transformer windings are poledcorrectly for positive feedback. Ifoscillation is not obtained immediatelywhen the switch is closed, reverse theleads to the high -impedance (collector)winding of the transformer.

By using small -sized circuit com-ponents, the audio injector shown inFigure 2(B) can be built completelyinto a test -probe handle. It also maybe built into a flashlight case, usingthe regular flashlight switch as theON -OFF.

An important virtue of the transis-tor is its low d. c. drain. This meansthat little if any grief will attendforgetfulness in turning the instru-ment off, provided the inadvertent ontime is not too long. In battery -operated tube circuits, on the contrary,such forgetfulness is reflected quicklyin A and B battery expense.Extractor -Type Audio Injectors. Someservice technicians, especially thosewho do no outside work, favor useof a regular signal generator for signalinjection. Many shops do not havean audio oscillator, but all havesome form of r. f. generator. Whenthe audio voltage from the internalmodulator is available at outputterminals, the r. f. generator canserve as an audio injector as well.Often, however, this signal voltageis not available and it is not advisable

Page 6 THE C -D CAPACITOR

DECEMBER, 1953 Page 7

to tamper with the wiring of theinstrument.

Figure 3 shows two extractor -typecircuits which will deliver an audiosignal from the amplitude -modulatedr. f. output of the signal generator.They are simple diode detectors ordemodulators. The extractor in con-junction with the modulated signalgenerator provides a suitable audioinjection signal in a simple and in-expensive manner.

Neither circuit can be consideredbetter than the other. They simplyuse different components and inputarrangements. The circuit in Figure 3(A) is a resistance -capacitance -coupledversion, while the one in Figure 3(B)is transformer coupled. They operateequally well and choice undoubtedlywill be dictated by which componentsare available to the builder.

In Figure 3(A), a shunt diode de-modulator circuit is employed. Thisarrangement does not require a d. c.return path for the germanium diodethrough the signal generator. The25 -millihenry r. f. choke and the0.0001-ufd. mica capacitor form aradio -frequency filter. The audio out-put is delivered at high impedance andis proportional to the modulated r. f.input amplitude. The output audioamplitude may be varied by adjust-ment of the signal generator outputattenuator.

In Figure 3(B), 'a series diode de-modulator circuit is employed. Oper-ation of this circuit assumes that thesignal generator provides a conductivepath between the two extractor inputterminals. This path will be providedthrough the attenuator resistors inthe signal generator unless there isa blocking capacitor in the output.If the latter is true, a small resistor(100 ohms of so) must be connectedbetween the input terminals of theextractor.

The detected audio component istransmitted through transformer T.This latter component may be anysmall audio transformer of the plate -to -line type. The low -impedance("line") winding is the one connected

to the 1N34 diode. The 0.001-ufd.capacitor serves as an r. f. bypass.

Some precautions should be observedin the use of the extractor -type injectorshown in Figure 3(B), in order toprevent hum pickup by the trans-former. If the transformer is not awell -shielded type, care must be takento keep it clear of magnetic fields,particularly those arising from thepower line or from line -operatedcomponents.

R. F. InjectorsLike audio injectors, the radio -

frequency signal injector should oper-ate at a fixed frequency. A reasonablechoice for general receiver servicingis the 455-kc. intermediate frequency.This will provide a signal which, onfundamental, will check the i. f. chan-nel of the average receiver, and willfurnish harmonics for the front endsof both broadcast and short-wavereceivers. The r. f. signal injectormust be amplitude -modulated, in orderthat the receiver loudspeaker may beused as an output indicator.Crystal Type. Figure 4(A) shows thecircuit of a modulated 455-kc. crystaloscillator. The i. f. crystal is con-nected between the plate and gridof a 6C4 triode in an untuned, Pierceoscillator circuit. Adjustment of the100-uufd. air trimmer capacitor acrossthe 50,000 -ohm grid resistor sets theoscillator for quick operation eachtime the ON -OFF switch is closed.

An ingenious scheme is employedfor amplitude modulating the oscil-lator with a minimum 'of components.An 0C3 regulator tube with a 0.1-ufd. shunting capacitor and 1500 -to -3500 -ohm variable series resistor forma relaxation audio oscillator circuitwhich modulates the d. c. plate inputof the 6C4 r. f. oscillator. The audiofrequency is varied by means of the2000 -ohm rheostat which may be setpermanently at any desired tone withinits range. The 1500 -ohm resistor inseries with the rheostat limits the0C3 current to a safe value when therheostat is at its zero -resistance setting.

Any small power supply delivering200 to 250 volts d. c. at 60 to 75 ma.

Page 8 THE GD CAPACITOR

0.05 MFD.400 V.

0.1MFD.

400 V.

OUTPUT CONTROL'10000 OHMS

l0.05 R.F.MFD. OUTPUT

400 V.

A.F. CONTROL2000 OHMS

0C3 WirewourdMODULATOR

- 200- +250 V. O

D.G.

(A) I.F. CRYSTAL TYPE

100 MMFD.Air trimmer

Tapbetween

1st. and 2nd.Pi's

4

63V AC

(B) SELF-EXCITED I.F. TYPE

ON -OFF

OUTPUT,CONTROL

(710,00MFD.

R.F.

OUTPUT

O

100-200 V.

Figure 4.

may be used. However, it must beof the transformer type and not aline -operated (transformerless) voltagedoubler. The power supply can bebuilt on the same chassis as theinjector. Since it requires no specialdesign or treatment, the power supplyis not shown in either of the schema-tics, Figure 4(A) or Figure 4(B).

High -impedance output is provided.However, ample output signal is

available so that satisfactory amplitudecan be obtained even when injectinga signal into a low impedance.Self -Excited Type. The r. f. injectorcircuit in Figure 4(B) employs a self-excited 455-kc. oscillator instead of acrystal type. A 6AU6 is used in anelectron -coupled circuit. Amplitudemodulation is supplied by a 6C4Hartley audio oscillator transformer -coupled to the suppressor of the 6AU6.

DECEMBER, 1953 Page 9

Transformer T may be any con-venient unit of the type intended tocouple pushpull plates to a low -impedance (200 or 500 ohm) line.The audio frequency is determined bythe values of capacitance Cr and theinductance of the entire center -tappedprimary winding. The larger the ca-pacitance, the lower the frequency.With an available transformer, thereader may experiment with a numberof capacitances in order to obtain thedesired tone frequency. If the audioamplitude is so strong as to block ther. f. oscillator, the 4700 -ohm 6C4 plateresistor may be increased with a giventransformer.

The radio frequency is determinedby the parallel resonant circuit formedby the 21/2 -millihenry r. f. choke andthe setting of the 75-uufd. air trimmercapacitor. The circuit is tuned to 455kc. with the trimmer about one-halfmeshed. The cathode tap for the6AU6 is taken between the 1st and2nd pi's at the ground end of thechoke.

Capacitor - isolated high - impedanceoutput is provided, but sufficient out-put signal is present for good ampli-tude when injecting signals into low -impedance circuits.

The d. c. power supply may be anyconvenient transformer -type unit sup -

455 K_C.I CRYSTAL

Iol

Ro

5000OHMS

Wirewound

CK 716

E C

CK 716 2000 OHMS

o+ 1111ON -OFF 30 V.

( A ) MULTIVIBRATOR TYPE

OUTPUT

B OSCILLATOR

Low-imp.

1

0.002 MFD.

2000OHMS

10K CK716

oR.F.

OUTPUT

Rm E 1B

0o High MODULATOR

á imp.

p0.1 MFD.

10 K 10 K

+1111111145 V.

U.T.C.502

2200OHMS

0/'ON -OFF

(B) I.F. CRYSTAL TYPE

Figure 5.

THE C -D CAPACITORPage 10

plying 100 to 200 volts at 50 ma.There is nothing critical about itsdesign, therefore no particular layoutis shown here. The power supplycomponents can be mounted on thesame chassis as the injector.Transistorized Multivibrator Figure5(A) gives the circuit of a simpletransistorized multivibrator which canbe used as an r. f. signal injector.When operated between 5 and 10 kc.,a multivibrator gives harmonics soclosely spaced as to produce somewhatof a broad interfering signal from thelow end of the standard broadcastband up into the short-wave spectrum.Such a signal can be used for quicklytesting a set, without tuning. If themultivibrator frequency is low enough,the i. f. and audio channels also maybe checked with its output.

A CK716 point -contact transistor isemployed. A junction transistor willnot operate in this circuit. A single30 -volt battery is used and can be thesmall -sized type designed for hearingaids. Output is taken across the 500 -ohm base resistor.

Oscillation results from positivefeedback voltage developed across thebase resistor, since there is no phasereversal in the grounded -base transis-tor circuit. The frequency is determinedlargely by the value of capacitance CSand the setting of the 1000 -ohmemitter rheostat. , Since the internalemitter - to - base resistance of thetransistor shunts the R -C circuit andvaries with transistors, a definite speci-fication of C. is difficult. With a0.002-ufd. mica capacitor at C:, adjust-ment of the 1000 -ohm rheostat, R:,should allow an individual transistorto oscillate at about 10 kc. Reductionof C. will increase the frequency.C. should be a good -grade micacomponent.Transistorized Crystal -Type. The cir-cuit of the modulated i. f. crystaloscillator in Figure 5(B) may beregarded as a transistorized versionof the tube -type 455-kc. unit (Figure4A). This circuit is intended for usewith point -contact transistors (CK716or equivalent) and will not work withjunction transistors.

The i. f. crystal is connected be-tween collector and emitter of theleft transistor in a manner analogousto the vacuum -tube Pierce oscillator.Emitter and collector voltages for thistransistor are derived from a voltagedivider comprising two 10,000 -ohmresistors in series. A single 45 -voltbattery is the d. c. source.

The right transistor is a base -tunedaudio oscillator which supplies thea. f. modulation to the crystal oscil-lator. Audio energy is coupled intothe r. f. stage through the miniaturetransformer (U. T. C. Type SO2).The audio frequency is determined bythe inductance of the high -impedancewinding of this transformer and anycapacitance in parallel with it. Thedistributed capacitance of this windingplus circuit capacitances produce afrequency of about 5000 cycles. Thisfrequency may be lowered by meansof an external capacitor connectedfrom base to ground at the modulatortransistor, to satisfy individual pre-ferences.

Strength of the audio modulationamplitude is adjusted by means ofthe rheostat Rm. Audio waveformis affected somewhat also by thisadjustment. R. F. amplitude, andreadiness of the oscillator to startwhen the d. c. is applied, is controlledby adjustment of the rheostat R0.

The injector operates most efficient-ly into high impedances. Ample signalamplitude is provided. In many in-stances, direct physical connection isnot required, sufficient signal beinginjected into the circuit under test bypointing the "high" output test prodclosely to the test point in the circuit.

Electromechanical InjectorA small "watchcase" high -frequency

buzzer makes an extremely simplegeneral-purpose signal injector. Elec-tromechanical in operation, it requiresneither tubes nor transistors. It setsup a broad interfering signal whichis effective i:n the injection testingof audio and r. f. circuits. Its effectscan be noted even at television front-end frequencies.

DECEMBER, 1953 Page 11

Figure 6.

Most small buzzers operate withbattery potentials between 3 and 6volts. On direct connection, theoutput -signal amplitude is rather high,and the output control shown inFigure 6 is necessary.

The output is d. c. - isolated by the0.005-ufd. coupling capacitor. The0.01-ufd. capacitor prevents short-circuit of the buzzer contacts by theOUTPUT CONTROL potentiometer.

A disadvantage of the buzzer as asignal injector is its acoustic noisiness.But there is some possibility of en-closing the device in a soundproofingjacket of some kind, such as heavysponge rubber or tlick felt.

Diode Noise ProbeA silicon diode operated with d. c.

reverse current generates steady r. f.noise which is effective up to several

Page 12 THE C -D CAPACITOR

hundred megacycles. Easilyobtaineddiodes, such as the 1N21 and 1N21B,can be used for this purpose butgermanium diodes are unsatisfactory.This noise signal, being broad andrequiring no tuning either of thereceiver or noise generator, is veryconvenient for injection testing ofreceivers.

Figure 7 gives the circuit of asimple silicon -diode noise generatorwhich can be built as a small probe.The 50,000 -ohm rheostat is the noise

level control, maximum noise outputcorresponding to minimum -resistancesetting of this control.

The noise probe feeds into theantenna input terminals of the receiverunder test. When the receiver doesnot provide a d. c. return path forthe diode (as might be the case whenan input blocking capacitor is present),a resistance RL equal to the receiverinput impedance must be temporarilyconnected across the probe outputterminals as shown.

ON -OFF 50 K

a 6 V.

1N21

Cathode

0.001MFD.

SilveredMica

Single Burgess 5540 or4 penlite cells in series

Figure 7.

DECEMBER, 1953 Page 13

HE RADIO-TRÁD!NC -POST.

This CORNELL-DUBILIER AdvertisingService is FREE to "Capacitor" readers.If there is anything of general interestor appeal in the line of electronic equip-ment or service that you want to BUY- SELL - or SWAP . . . if you wanta job or need help, these columns are atyour service.

Please PRINT or TYPE your Ad clearlyand limit it to 40 words including yourname and address. Because of spacelimitations - only one Ad at a time --please.

If you have a "CHANGE OF AD-DRESS" - give both your OLD and NEW

and mark your request "For C -D Capac-itor Mailing List."

Ads are published in the order re-ceived and as space permits. If your Addoes not appear in one of the two issuesfollowing the month in which you submityour Ad - please RESUBMIT it.

CORNELL-DUBILIER ELECTRIC CORP.reserves the right to edit your Ad to con-form to its policies and is the final judgeof its suitability for publication. We donot assume any liability or responsibilityfor any transaction that results. Makeyour deal direct with the advertiser listedin the Ad.

WANTED - General Industries or Rek-O-Kut disc cutting basic assembly. Also,good tube and set tester. Cash, or

recorder, amps, etc. JohnT. Moore, Box 63, Seneca, S. C.

SELL OR SWAP - Heath TS -2 TV align-ment gen., A-1 $30; 2 like new seleniumrectifiers rated 275 v. DC at 2 amp. $25or swap for A-1 Simpson 260. VirgilFranceschini, 708 Bigler Ave., Barnes -boro, Pa.

TRADE - Eico sweep gen., Mallory UHFconverter, both in A-1 cond., Riders TVmanuals 1 thru 5, 17CP4, 17WP4, 17BP4,need tape recorder or ?? E. A. De-Cobert, 609 Henrietta St., Gillespie, Ill.

FOR SALE - Mallory model 6RS10, 6 v.power supply. Guaranteed perf., $25.Matko Radio and TV, 960 Graham Ave.,Monessen, Pa.

WANTED - Buyer for 110 v., 60 cycle,all -wave European radio, Blaupunktmodel 4W76. Beautiful cabinet, flywheeldial, working cond., $10 FOB. W.Greenbaum, 17 Poplar St., Elmsford,N. Y.

FOR SALE - Precision model ES -500-A,5" scope, A-1 cond. Prefer local sale.John J. Oskay, 70 Senior St., NewBrunswick, N. J.

WANTED - Hallicrafters S-51 rcvr., newor used, with or without 6V vibropack.State price and cond., FOB Milwaukee.Robert 1. Schaack, 8628 W. Melvina,Milwaukee 16, Wis.

FOR SALE - Astatic VHF TV booster,channels 2 to 13, $15; Electro VoiceTune-O-Matic, model 3000 VHF booster$15. Both exc. cond., FOB. R. Slinkman,204 Dauphin Bldg., Harrisburg, Pa.

RADIO DESIGNING - Radios, amps.,scopes, etc., $1 per tube. Questionsanswered - 2 for $1. B. Hall, 150 East5th St., Jacksonville 6, Fla.

SELL - 2500 v. DC power supply, 300 MAconservative rating, built on 19" greypanel $40. Also 41" grey deluxe cabinet$35. B. R. Spells, 1410 Grandhaven,Salinas, Calif.

WANTED - Any cond. - cash or swap:Grid dip meter; Q meter; MeasurementsCorp. and microwave test equip. L.DeZube, 1128 Wagner Ave., Philadelphia41, Pa.

FOR SALE - Back issues Radio TV News1950, 1951; Radio Electronics 1951 thru1953; Service 1950 thru 1953. 25c percopy, postpaid. Write for list. CherieRadio -TV Service, 1865 15th St., Wyan-dotte, Mich.

Page 14 THE C -D CAPACITOR

WANTED - 40 and 80 meter coils, circuit 1WANTED - Mint or used U. S. anddiagram and operating manual for Meck foreign stamp collections for radio partsT60-1 Transmitter. George W. Moran, and ham gear. Send stamps or lists.8059 88th Ave., Woodhaven, 21, L. I., Robert N. Boulle, 236 Sixth Avenue,N. Y. Long Branch, N. J.

SWAP - Series 844 Precision VOM, 24ranges; Model 535 Supreme scope 3",for good 35 mm. camera, or cash.Louis Siegel, 563 East 94th St., Brooklyn36, N. Y.

FOR SALE - Riders 1-5 abridged, 8, 11

to 16, like new, $65; BC -455B, exc. cond.,$10, postage extra. Robert Franke,R D 1, Oley, Pa.

FOR SALE - Altec Lansing 604C spkr.,FOR SALE - Two large 115 v. AC, 60 A-1 cond., make offer. C. B. Parkinson,

4 431 N. Encinitas, Monrovia, Calif.cycle Selsyns, one mounted in cabinetwith pointer and compass dial, $20.C. Shoreys, Winkle Point Drive, RFD 2, WANTED - Hallicrafters model S-72 port -Northport, N. Y. able radio, 4 band, 540 kc to 30 mc.,

must be in A-1 cond. - cash for same.Charles S. Brotzman, 173 Main St.,

WANTED - Model E-400 Precision TV -FM Mexico, Me.sweep gen. Will pay cash. John A.Kimm, 934 Judson St., Evansville 13, Ind. SELL OR TRADE - Riders TV manuals

1, 2, 6, 7, 8, $50; used 12 AP4, $10.WANTED - 304TL's or electrical meas- R. and M. Television, 284 Morris Ave.,

uring equip. Have Willard ER -6-2B Elizabeth 3, N. J.storage batteries. W. Slack, 3038 Addi-son St., Chicago 18, Ill. FOR SALE - Solotone coin operated radio

system, 12 individual boxes, and fourFOR SALE - T-22 ARC 5 (7-9.1 mc.) channel tuner; Heath tube tester and

Xmitter $15; matching modulator $7; Vac. Voltmeter, complete instructions.BC -451 control unit. A. T. Smith, 2653 Reasonable offer acepted. E. H. Huber,Dearborn St., Salt Lake City, 6, Utah 31 N. Stenton, Atlantic City, N. J.

FOR SALE - Motorola table radio $3; WANTED - Multimeter. Have SamsZenith portable radio $6. J. Willis, Photofacts, radio, TV, phonograph and271 S. Washington St., Wilkes Barre, Pa. radar books, tubes, permanent needles,

40' TV mast. William Bashta, 19447Keswick St., Reseda, Calif.WANTED - 16 mm. box -shape movie

camera with lens for ham TV cameraexperiments. Shutter mechanism doesn t TRADE - National Schools radio and TVmatter. Will swap in excess of home study course, for U.S. and foreignvalue or buy for cash. David Gnessin, stamps, or typewriter. Joseph Palmer,64 Mt. Joy Place, New Rochelle, N. Y. 786 East 94th St., Brooklyn 36, N. Y.

WANTED - New or used in perf. shape SWAP - Hallicrafter S-72 portable unitWE 262A or B tubes. Have tubes to just returned from Hallicrafter fieldtrade: WE300B, 350B, 310A, 274A, 274B, service lab, mechanically perf., cabinetWE261A, 284D, 211E. H. H. Harrison, fair. Will trade for Hallicrafter S-40 or300 37th Way, Sacramento, Calif. similar rcvr. Thomas T. Smith, 1510 6th

St. South, Fargo, N. D.

SWAP OR SELL - RF Ammeters, fieldtelephone sets in leather cases, UTCpower XFMR 422. Want good taperecorder. D. Pomers, 401 SchenectadyAve., Brooklyn 13, N. Y.

SELL OR SWAP - Channel 217 UHF con-verter and VEE DX Antenna $15. EstesO. Terry, Starkey, Va.

SELL OR TRADE - Blond Brush BK 411tape recorder, perf., $100; portable wirerecorders with Webster and St. Georgedrive and home built amps , $45 and$35. All in good working cond. F.Schwarz, 17 Woodbridge Dr.,, Stamford,Conn.

TRADE OR SELL - Tubes, I.F. Trans-formers, condensers, output transformers,

WANTED - Riders manuals to begin set. chassis, testers, replacement guides,State price, cond., and numbers. Elec- 8 vols. of Sams Photofacts, Trouble-trical Service Appliance Co., Box 528, shooters handbooks, etc. EarnestMechanicville, N. Y. Couch, 1805 College St., Decatur, Ala.

DECEMBER, 1953 Page 15

WANTED - Viking II XTR; two meterXTR and rcvr. 522; two meter gearrunning high power. W2HNG, Box 131,Jamaica, L. I., N. Y.

FOR SALE - Superior AM sig. gen. model1230; National Electronics VOM; Dayradtube tester, good for older tubes orparts. Lloyd Ereckson, 416 4th Ave.,NW, Jamestown, N. D.

WANTED - Meissner model 9-1065 radio-phono-recorder-PA system chassis, with-out carrying case, panel board. Notparticular about cond., if it can berepaired. Alexander's Radio Service,3511 Church St., Greensboro, N. C.

FOR SALE - BC -348, power supply, spkr.,instruction bk. $55; HRO M (needs align-ing), $45; Hallicrafters Hi -Fidelity radio,25 w. Hi -Fi amp. Hi -Fi spkr., cabinet,changer $80; AVR 7H heavy-duty, three -band aircraft rcvr., $10. Vladimir Algin,107 Abbott St., Staten Island 5, N. Y.

FOR SALE - Pentron two -speed taperecorder, Magic Eye amp., spkr., tancase, mike, 3 7" tapes, $89. T. Fortoan,9010 N. Laramie Ave., Skokie, Ill.

FOR SALE - Eico VTVM, never beenused, $39. James Romine, 717 W. SantaBarbara, Los Angeles 37, Calif.

SELL OR SWAP - Model D GeneralIndustries phonograph motor, 331/3 and78 RPM, governor control, gear drive,all necessary accessories, 10" turntable.Make offer or what have you? H. W.Gould, 422 North 6th Ave., Portsmouth,Va.

WANTED - "Electrolytic Capacitors" byPaul McK. Deeley. Kenneth G. Alley,311 ,S. Oakland Ave., Carbondale, fii.

FOR SALE - Disc recorder $45; hamtransmitter 360 w. $75; miscellaneousradio tubes and parts. Jerry Oddo,67 - 29 Kissena Blvd., Flushing, N. Y.

FOR SALE - Feiler Electroscope modelTS -8, tests all electrical appliances,accessories, motors, receptables for ap-pliances and built-in continuity tester.A-1 cond., complete instructions $17.Arnold M. Herman, 540 N. LdwndaleAve., Chicago 24, Ill.

FOR SALE - Emerson FM rcvr., $8; 8 w.audio amp. in cabinet, $8; 3 WestonSensitrol relays, $20; Weston Photroniccell, $2; test equip. and tubes. O.Hergenhan, 503 S. 15 St., Newark, N. J.

FOR SALE - Hammerlund HQ -129-Xcomm. rcvr with matching spkr., perf.cond., $125. Dick Naney, 1235 WoodSt., Dubuque, Iowa.

TRADE - Pair "Handi-Talkies" BC -61I -C,5500 kc., exc. cond.; or 10x70 binocularsin good cond. Want 2 -speed, 2 -tracktape recorder with playback, in A-1cond. W. G. Young, Jr., 1846 - 17th St.,SW, Allentown, Pa.

SWAP - Want 12" (minimum) TV. Have15 w. audio mod., TVI proof Hammar-lund 4-20 XMTR., homemade comm. rcvr.Prefer local. C. F. McHenry, 2460Davidson Ave., Bronx 68, N. Y.

SWAP - ARC 5 rcvr., 1.5 to 3 mg., exc.cond., with dynamotor, for set of 20meter coils for National FBX rcvr.Hudson Radio Service, 523 State St.,Hudson, N. Y.

WANTED Copies of Scott News.,especially ones containing details onScott Philamonic rcvr.; also Scott cata-logs. L. Marks, 14 Avenue Road,Kingston, Surrey, England.

SELL OR TRADE - 8x10 Eastman D-2view camera, fiber carrying case, 6 filmholders, heavy duty tripod; 8x10 crownprinter; 4 1 -gal. dev. tanks, porcelain;12 film hangers. Want tape recorderor Omega enlarger. Tronson and Run -yard, Sound, Lake Villa, Ill.

FOR SALE - Millen type 90651 grid -dipmeter, like new, coils in rack for 1.7to 300 mc., $30, postpaid. Rufus P.Turner, 919 E. 116th Place, Los Angeles59, Calif.

FOR SALE - Feiler sig. tracer TS -1 withinstructions $5. Paul J. Wesner, Box 231,Green Ridge, Pa.

WANTED - Crater Lamps, for Jenkinsmodel R-400 60 line Radiovisor, will paycash. J. Carroll, 33 Concord St.,Jersey City, N. J.

FOR SALE - Precision E-400 sweep gen.,perf. cond., all leads and instructions,original carton, best offer over $85,shipped express collect. Stephen Plau-ski, 425 - 3rd St., Brooklyn 15, N. Y.

SWAP - Approx. 8500 ceramic condensers,values from 1000 to 5000 mmfd. forstandard brand TV and radio tubes.Joseph Rothbart, Expert TV Inc., 955Ogden Ave., New York 52, N. Y.

Page 16 THE C -D CAPACITOR

FOR SALE - Model 0-8 Heathkit scope,expertly wired and thoroughly tested,$49 COD. Robert Burns, 28 N. HighlandAve., York, Pa.

WANTED - Two smoothing and twoswinging chokes, 500 ma. and 7500 v.insulation; also two 15 amp. variacs.Send price and specifications. DonaldF. Cameron, 1619 Milburn Ave., Toledo6, Ohio.

SELL OR TRADE - Electro Voice TVbooster, model 3000 $25; Astatic modelCT -1 booster, $15; NRI model 33 sig.tracer, $30. Want RCA model WV -77AVoltohmyst or other VTVM. ObernVandver, Wise, Va.

FOR SALE - Hallicratter SX-71 rcvr. andmatching spkr., used less than 20 hours.Make offer. Ole Lund, Box 383, Roseau,Minn.

WANTED - Hickok Mutual Conductancetube tester with tube life and noisetest features. Will sell or trade Weston774-5 tube tester and set analyzer. RoyE. Cauble, 114 - 44 226th St., CambriaHeights 11, N. Y.

FOR SALE - Precision E-400 sweep gen.,never used ,still in guarantee $100, 18vols. Riders Troubleshooter Guides withindexes, $70; 522 transmitter without832, $10. H. Gathercole, 45 AberdeenDrive, Huntington, N. Y.

FOR SALE - BC -1335 FM transceiver,27-39 mc., 6 or 12 v., exc. cond., tech.manual, also complete set of 120 crys-tals, $75 or best offer. R. L. Ludlum,824 San Miguel Road, Concord Calif.

FOR SALE - Precision sig. gen. E -200-C$45; Triplett TV -Marker mod. 1235 $17.50;Scope Probe, Hickok type 34 crystal, $5.All items in exc. cond. H. F. Buchanan,2729 W. Main St., Louisville 12, Ky.

FOR SALE - Webster 156, GE cartridgeand preamp., $15; Radio Craftsmen RC -10, $75; RC -2 amp., $25; HallicraftersS-38, $28. Norman W. Tetenman, 2350East 27th St., Brooklyn 29, N. Y.

FOR SALE - Triplett sig. tracer model2432, $25; Heathkit batt. eliminator BE -3assembled, $25. Both perf. cond. andFOB. DeVoe Radio Service, Box 414,Spring Green, Wis.

FOR SALE - Practically new model 0-8Heath scope, completely assembled. PatHill Co., 129 Norfolk Ave., Norfolk, Neb.

WANTED - 11/2 A-90 B Eliminators; 2 v.eliminators, 6 v. eliminators. Many itemsto offer in exchange. E. G. Bartlett,Atlanta, Mo.

TRADE - BC -453, 454, 455 rec.. and rack;BC -3571, 357E rec.; panel meters, turn-table and pickup Astrograph. Wantold guns cold rifles Tap or German.Thomas Rohland, 834 Penna. Ave.,Huntingdon, Pa.

FOR SALE - Eico scope 425 push-pulldeflection plenty of gain, hardly used,$35. Alex Siegel, 1516 ShakespeareAve., Bronx 52, N. Y.

SELL OR SWAP - BC -348 rcvr., fullyconverted for Hi -Fi eauip., Garrard 3 -speed changer, good preamp., midrangehorn and driver for 3 -way system. G. L.Ottinger, 430 Raymond Street, ChevyChase, Md.

SELL OR. SWAP - 6 - string GibsonHawaiian Electric Guitar, exc. cond.,$65, or for a good tube checker, orwhat have you? Prefer local contact.Murry Liebowitz, 360 - 95th St., Brooklyn9, N. Y.

FOR SALE - Complete low power ama-teur radio station. Receiver HallicraftersS40 -A, Hallicrafters HT6 25 w.telegraph transmitter, complete withmike, coils, and meters. External vfo oreco operation possible, $200. SH 14703Cpl. M. Makarchuk, C/0 Army SignalsStation, Shilo Manitoba, Canada.

FOR SALE - Hickok model 202 VTVM;3" RCA scope, model 1S5A, bosh invery good cond. Make offer. StathisG. Linardos, 190 Wadsworth Avenue,New York 33, N. Y.

FOR SALE - CRM-46153 Comm. rcvr.,freq. range, 240 kc., - 2000 kc, in threebands inc. broadcast, shock mountedcabinet, good cond., $40. J. A. Mac-Millan, 36 River St., Ballardvale, Mass.

FOR SALE - Pilot tuner FM rcvr. withcabinet, perf. cond., $20. J. R. Blundin,214 W. 2nd St., Mt. Carmel, Pa.

WANTED - Midwest radio rcvr. model18-36, made in 1935. Need not be niworking cond., less spkr., no cabinet.State Price and cond. Precision ServiceCo., 2 N. Quincy St., Brockton 58, Mass.

FOR SALE - Eico 5" scope like new, $30.Trade for 7" scope. John A. Kimm,934 Judson St., Evansville 13, Ind.

DECEMBER, 1953 Page 17

SELL - Never used approved A-200 sig.gen. and instruction book $25 cash orswap for clean well -cared -for S -20Rrcvr. Also interested in CCS-ratedtransformers and parts. Eddie Howell,Box 126, Lumberton, N. C.

SALE - DuKane Tape Recorder, 71/2"speed, fast forward and reverse, 50 to8500 cps., Xtal mike, uses 5" and 7"reels of tape, dual track $120. Al cond.Hal Gold, 209 S. 3rd St., Brooklyn 11,N. Y.

SELL OR TRADE - Keystone 8 mm proj.Model C8 300 w. with case. WantVTVM, Eico, or Heathkit. Sidney Gold-stein, 2129 76th St., Brooklyn 14, N. Y.

WANTED - Back issues of "PhotolactIndex and Technical Digest," 1950 toJuly, 1953. Also diagrams of audio amps.and lab. equip., such as power supplies,etc. Sheldon Shostack, 1010 HegemanAve., Brooklyn 8, N. Y.

TRADE OR SELL - Hickok 288X; ED -100VTVM; Precision 910 tube checker; RCA16GP4 pix tube; BC -412B radar scope;Emerson 602 FM set; Philco sig. tracer.Want cash, 5" scope, TV sweep gen.;209 Ammeter. John Pellock, 2271/2 W.Cook, Springfield, Ill.

WANTED - Oscilloscope for exactingaudio application, vert. amp. flat from40 to 20,000 cps. Cash or trade taperecorders, stereophonic equipment andrecords. Herb Heller, 2121 Renrock Rd.,Cleveland 18. Ohio.

WANTED - Hi -Fi equip., tuner, turntable,spkr., spkr. enclosure, Williamson amp.Will swap cameras, photo equip. MartinHerbstman, 97 - 25 64th Ave., RegoPark, Queens, N. Y.

WANTED - Rek-O-Kut 16" turntable 33& 78 rpm with Hysterisis Sync motor ormodel G-2 or B-1611. Must be in goodcond., L. J. Schnedorf, 610 Monroe Ave.,River Forest, Ill.

SELL OR SWAP - Like new BC 398Kreceiver with commercially built powersupply for good tape recorder, 20-40-80meter coils for Collins 30J - 10-20 beamand rotators, or what have you. L.Meister, 5 Highfield Lane, Nutley, N. J.

WANTED - For C -D, RCA type AVT-112A,AVR-20A, AVA-126A, or equivalent.Equipment must be good & priced right.Center TV Co., 867 Broad St., CentralFalls, R. I.

FOR SALE - RCA 156 Scope, good cond.,complete with test leads, $30. P. N.Sansosti, 2229 Kentucky Ave., Baltimore13, Md.

WANTED - FM Pilotuner, model T601 infair cond. State price. R. W. Gran-ville, Dravo A-408, Lehigh U., Bethlehem,Pa.

SELL OR TRADE - Master Mobile antennawith 80 meter loading coil & Jr. mountless spring. Best cash offer or hamequip. takes it. Theodore Fine, 3139Godwin Ter., Bronx 63, N. Y.

TRADE - Eicor model 42S scope, Eicormodel 360 sweep gen. for speed graphic21/4" x 31/4" or 4" x 5" camera. Chuck'sRadio Service, 123 S. 13th St., Clarinda,Iowa.

FOR SALE-McMurdo-Silver 904 Capacitorand Resistor Bridge $12. Paul F. Bahr,1013 Indiana St. SE, Albuquerque, N. M.

FOR SALE - Book, Modern Radio Service,1st ed., like new $3 postpaid. Herman,25 - 95 41st St., Astoria 3, N. Y.

FOR SALE - 10" Silvertone walnut plastictable model 9125-B TV set, 21 tubes, verypowerful, good cond., $36, expresscharges collect. Jones Radio Co., 1115Rambler Ave., Pottstown, Pa.

TRADE - Hallicrafters 7" TV, needs littlework, for "Carrier Call" inter-coms.,must work on line current or tubetester in oper. cond. Peer Shovel,332 Maujer St., Brooklyn 6, N. Y.

FOR SALE - Sterling Emission tube tester;also Philco AM sig. gen., $10 eachFOB. Agostino, 223 S. Winebiddle Ave.,Pittsburgh 24, Pa.

WANTED - Man thoroughly experiencedin radio and TV servicing, must fix themall. Must be honest and have bestreferences. Wyatt Appl. Co., 406 N.Pine St., Searcy, Ark.

SELL OR SWAP - Cornell-Dubilier model110RT35 converter 500 w., Electronic Ind.model 204 cony. 150 w., ElectronicDevices model A-50 cony. 50 w., slightlyused, exc. cond cost $175. Like taperecorder or what ?? David J. Weisen-feld, 420 West End Ave., New York 24.

FOR SALE - NRI model 55 scope andR -C tester $130. S. Gentile, 206 Wood,Hatboro, Pa.

Page 18 THE C -D CAPACITOR

FOR SALE - $50 for complete 10 m.portable mobile rig, Linx police xmitercomplete with control box, cable andbat. cable, Gonset 10-11 cony. withnoise limiter. All good cond. GilbertWatson, 3008 Sansom Ave., AlabamaCity, Ala.

FOR SALE - Supreme Audolyzer, model562. Misc. parts and tubes. Ideal set-up for starting small business, retailvalue of tubes and parts $350. Sacrificefor $95. Trade for R5/ARN7 or BC 433radio compass. Rudolph Fannon, 7607Kitty Hawk Ave., Los Angeles 45, Calif.

TRADE - Cornet and music course andWebster -Chicago wire recorder for TVor 16 mm. projector. He:belt Hoch,418 E. 53 St., Brooklyn 3, N. Y.

WANTED - 16 mm movie sound projector,amp. optional, 12BP4 pix tube in goodshape, or any 12" pix tube to replace10BP4 tube. Have TV items and cash.John Arnold, Box 84, Bluffs, Ill.

FOR SALE - Precision E -200-C sig. gen.,Precision 1020-P tube and set tester,Supreme 574 VTVM. Guaranteed likenew. All three $140. W4LAF, 460 N.Limestone, Lexington, Ky.

SELL OR SWAP - Heath 0-6 scope A-1factory calibrated, for Heath 0-9, shippedto me from factory; Meck 7" TV, A-1;RME Preselector model 08-20; Starrett"Ambassador" TV, table model, $50.Robert Peters, Lincoln Way, W., Ext.,Massillon, Ohio.

WANTED - Sweep gen., have Heath sig.tracer, 3 years back issues of R.N. andElect. C.R.O. tube plus other radio partsand tubes. I. P. Chipman, Rt. 9, Box368, Tuscon, Ariz.

SELL OR SWAP - 150 battery tubes -1J6, 1C7, etc. Want late model testequip., or sell to best offer. Kruse TVService, 804 Linwood Ave., Valparaiso,Ind.

REPAIR SERVICE - All makes test equip.repaired and calibrated by factory staff.Ship instr. postpaid, insured, immediateservice. Douglas Instrument Laboratory,176 Norfolk Ave., Boston 19, Mass.

SELL OR SWAP - Hallicrafter S38 comm.receiver and GE 3 -way AC -DC -batteryportable receiver. Want sig. gen. orcash. No reasonable offer refused. F. J.Mangiere, 9407 - 75 St., Ozcne Park16, N. Y.

FOR SALE - Heathkit TS2 sweep gen.Perf. working cond., $45. Ship FOB.D. Weiner, 3012 Nash Pl. SE, Washing-ton 19, D. C.

FOR SALE OR TRADE - Transformer, halfwave, 115 v. primary, 3200 v. secondary,300 ma. and camera Rolleirnrd reflex.Gene Beirne, Box 206, Roxbury, N. Y.

FOR SALE - Heathkit vacuum tube voltohm meter, fair cond., needs calibration.Asking $20, instruction book included.William A. Borras, 731 Avenue "B",Westwego, La.

SELL OR SWAP - Pair GE Selsyns model2J5A2, Ingersoll-Rand size 00 20000hand air grider, 24 1 -hr. sound recordingwire, BC474A complete with power sup-plies, for 16 mm films, 10-20 beamrotators, ham or photo gear. Meister,5 Highfield Lane, Nutley, N. J.

WANTED - Coin oper. radios. Advisemake and cond. H. D. Vorhaver, 122S. Main, Chincoteague, Va.

WANTED - Instruction book 03-10-139 foroperation and maintenance of RadioTransmitter BC375E. J. P. Hyde, Ma-nassas, Va.

WANTED - 2 station intercom, will trade10" TV in good order, also have othertest equip. NYC area. F. Hellauer,4135 De Reimer Ave., Bronx f, N. Y.

FOR SALE - Tape recorder Brush BK-414; Scope Sig. Corps. BC -412B; WEReproducer 4-A. Locals only. N. I.Wolk, 1411 Avenue N, Brooklyn 30, N. Y.

WANTED - Grunow chassis 12-B modbl1291 with spkr., must be in workingorder. D. W. Sheldon, Del -Bay Apts.Building, R.D. 1, Salem, N J.

FOR SALE - TV alignment gem., Heathkitmodel TS -2, literature, perfect cond.,completely assembled and factory tested.Freq. 10-230 mc., built in absorptionmarker., $25. John R. Garner, 320 S.22nd St., Allentown, Pa.

FOR SALE - Meissner model 8-C FMtuner, walnut cabinet, I.B.'s included,fine shape, $25 FOB Hal Magargle,4812 Cooper Lane, Hyattsville, Mo.

FOR SALE - Established radio businesswith nice small home, right in town.Wonderful chance for TV. MacArthur,120 N. 1st St., Yucaipa, Calif.

DECEMBER, 1953 Page 19

FOR SALE - Teletype printer with table FOR SALE - RCP model 424A batteryand padded dust cover. Metered cony. operated volts ohms amp tester; ATRwith polarized relay. Want used test inverter 110 DC in, 110 AC out. 325equip. W. L. Brunner, 318 W. Galer, watts cap. intermittent, 225 watts con -Seattle 99, Wash. tinuous. V. Vigliana, 70 - 80 KenmoreSt., New York 12. N. Y.

FOR SALE - EMC model 104 VOM plusHV probe, model HVT, for same. List FOR SALE - 15 pieces of test equip.price for both $35. Will sell for $24. All that is needed for AM, FM, TVFrank T. Adamo, 2730 Pitkin Ave., and auto radio servicing. VincentBrooklyn 8, N. Y. Baratta 53 - 05 69th St., Maspeth, L. I.,

N. Y.FOR SALE - Heath BE -3 battery elimina-

tor, used very little, $22.50; Heath con-denser checker $15. Postage paid orCOD with 1/2 deposit on each. Morton'sRadio, Box 83, New Ellenton, S. C.

FOR SALE - Three Precision instruments:VTVM EV-10; sig. gen. E -200-C; tubetester 612, all for $200. "Radio -Repair"neon sign free for promptness. JohnW. White, 403 Sterling Ave., Winona,Miss.

WANTED - Late model Eico or Heathscope. Have Eico 315 sig. gen., exc.cond., RCP 802N tube and set tester.S. Altmann, 65 - 20 Parsons Blvd.,Flushing, N. Y.

FOR SALE - Hammarlund HQ 129-X;Harvey - Wells TBS 50C transmitter;Harvey - Wells power supply. $225 forall. George A. Maslyar, 418 Charles St.,Plymouth, Ind.

WANTED - Plastic case model RBU-176Sonora with dial scale. Frank Madden,21 Stuyvesant Ave., Newark 6, N. J.

SELL OR SWAP - RCA ACR-136 receiver,550-18000 kc., $25; BC -348-0 convertedto 110 v. AC, and spkr., $60; Waller150 w. aircraft transmitter, with tubes,less power, $40; Mon -Key, $25. NeedJohnson "Match -Box." A. E. Kimeldorf,936 Chancellor Ave, Irvington, N. J.

FOR SALE - Harvey - Wells TBS 50-Cxmitter; home built power supply, Na-tional NC -33 rcvr., carbon hand mike.All in exc. cond. Best offer. AlbertLeBel, 50 Walnut Rd., S. Hamilton, Mass.

SELL - RCP model 805B tube and settester, good cond., $75; ProgressiveRadio Kit, 15 radios in one, $12. W. G. WANTED - Sylvania model 220 tubeBolduc, 10 Brier St., Fitchburg, Mass. tester, used but must be in good shape.

No other make wanted. George Mashek,R.R. 2, Box 45, Marissa, Ill.

FOR SALE - Standard TV Cascode tunermodel TV3109 with tubes, $16; StandardTV tuner, Admiral, part number 94C8-1,like new with tubes (6AG5, 6J6), $6.Mike Peterhans, Pond Farm, Guerneville,Calif.

SELL OR TRADE - Good radio cabinetfor Philco console, $10, or will tradefor small radio in oper. cond. Alsocabinet for Apex, model 10-B, console.Oscar Taylor, Uniontown, Ky.

FOR SALE - Triplett model 630-A; NRIsig. tracer model 33, never used; NRIsig. gen., model 88; Eico battery elimi-nator and charger, model 1040. All ingood cond. and reasonable. Walter E.Niemiec, Carrier 39, Utica P.O., Utica1, N. Y.

FOR SALE - Two -year -old tube tester,model 3413-A Triplett, A-1 cond., $50,picture tube adapter included. ErnestE. Potvin, R.D. I, Ives Road, EastGreenwich, R. I.

FOR SALE - Tape recorder, 3 -way port-able radio, 3 -speed changer-phono, sliderule, drafting set, books. Sidney Gross,17 W. 108 St., Shanks Village, Orange-burg, N. Y.

WANTED - Ohmite resistor cabinets(cabinets only). Write stating price,cond., etc. A. S. Cooke, 21 St. PoolsCourt, Brooklyn 26, N. Y.

FOR SALE - Precision sig gen., SeriesE200 -C, like new $40. Also Triplett tubetester, model 3413, portable, all metal,like new, $35. $70 for both. C. DePeri,9 Alabama Ave., Paterson 3, N. J.

FOR SALE - AC -DC phonomotor, com-plete with turntable, all speeds, $7.50,rotary type gen. from DC to AC, 300 w. SELL OR TRADE - Sig. gen., Heath SG -7,J. Kramer, 229 E. 7th St., New York like new. Want model LG-1. M. C.9, N. Y. Stutzbach, Box 567, Red Hook, N. Y.

Page 20 THE C -D CAPACITOR

TRADE OR SELL - National short-waveradio, model N.C. 33 4 bands, for CivilDefense FM radio - 30 to 50 Mc. or152 to 173 Mc. Hy. Knoller, 1590 E.22 St., Brooklyn 10, N. Y.

FOR SALE - New Philco visual alignmentgen., complete with built-in scope. Makeoffer. Chase Radio, 7 S. I6th St.,Richmond, Ind.

FOR SALE - Hickok 610A, like new, $150.Craftsman 4" screw cutting lathe, com-plete motor, chuck, gears, cutters, likenew $40. V. Iavarone, 1218 Leland Ave.,Bronx 72, N. Y.

FOR SALE - Signal Corps BC -375-E radiotransmitter, including dynamotor, con-necting cables and four tuning units.Will sell between $65 and $80., or willtrade for newer transmitter. RichardEbeling, 33 Randolph Rd., White Plains,N. Y.

FOR SALE - Super -Meter, model 670A,A-1 condition. Discontinuing my radioservice. First money order for $20 takesit. Also Challenger crystal mike, $3.Frank Bou, 4335 N. 6th St., Phila., Pa.

FOR SALE - Complete radio course byElectronic Institute, Detroit, $35; NRIService Manual $12; Home Appliancecourse by Christy $40; other books andradio parts. Travis Heard, 10260 Oak-land, Detroit 11, Mich.

FOR SALE - Due to illnes am offering mystock of radio and TV parts at anyreasonable price you care to suggest.Send for complete list. Ed Galovic, 96Egbert Rd., Bedford, Ohio.

FOR SALE - Webster - Chicago wirerecorder or will swap for what haveyou? Charles Grob, Radio -TV Eng.,214 1st Ave. East, Cullman, Ala.

FOR SALE - Precision Z. S. 500A scope,used 6 months, $120. Simpson 479 TVsweep and marker alignment gen., $195.Equip. like new, all cables and oper-ator's manuals perf. and clean Packedand insured. Prices FOB Oakland, Calif.Clifford R. Fox, 3749 Madrone Ave.,Oakland 19, Calif.

WANTED - Circuit diagram for BC-AR429,also plug-in coils above 7500 ka. Quoteprice wanted. O. B. Millar, Coalinga,Calif.

FOR SALE - Photofacts, 101 to 207, $100.Perf. cond. Aulabaugh TV & Appliances,Box 95, Cortland, Ill.

SELL OR SWAP - 16 mm, motor -driven,movie projector with 1700 ft. film, $25.Need battery eliminator, or what haveyou ?? Robert C. Gelnett, Liverpool,R.D. 2, Pa.

FOR SALE - Manuals on aircraft main-tenance such as: Airplane Propellers,Aircraft Sheet Metal Work, etc. Alsosome NRI booklets. Complete list onrequest. Louis Porsetsky, 137 - 16 169thSt., Springfield Gardens 34, N. Y.

FOR SALE - Vols. 2, 4 and 5 of OfficialRadio Service Manual by Gernsback ingood cond., no pages missing, bestoffer, FOB, Atlanta. C. Duncan, 338Candler Rd. SE, Atlanta, Ga.

WANTED - Instruction manual. for model900 Vomax, model 906 sig. gen., otherMcMurdo -Silver equip. Will pay $1 foreach if in good cond. Marvin Feuerborn,Valparaiso Tech. Inst., Valparaiso, Ind.

WANTED - Large tube TV of standardmake in trade for Remington. 12 gaugeWingmaster 870 deluxe, A-1 cond. AlsoMossberg 25A .22 Cal. special targetsights. All in fine cond. Oliver Klein,Box 824A, Rt. 11, West Allis: Wis.

FOR SALE - Heathkit tube tester modelTC-1 with instruction book, completelywired, $20. Checks large, regular,miniature, octal, loctal, Hytron, 9 -pinminiature, pilot lights. Used only a fewtimes. Donald Pope, 26 Virginia Rd.,Arlington, Mass.

SELL - Complete Mobile Rig, TBS 50C,PE -I03, RME MC -53 (2-6-1OM> Converter,Master 10m whip and mount, relay andtwo handsets. Exc. cond. Will sellseparately. Al Valunas, 91 LynwoodAve., Wilkes-Barre, Pa.

SELL OR TRADE - Supreme model 665Composite Video gen., Simpson model485 Cross Hatch generator, A-1 cond.Reasonable cash offer, or trade for usedsmall screen table model TV sets.Electronic Engineers, 4487 E. Tulare St.,Fresno, Calif.

FOR SALE - Premier AM sig. gen., model570, only $40. For N.Y.C. residents only.Theodore Popel, 1223 Elm Ave., Brooklyn30, N. Y.

FOR SALE - Simpson Crosshatch gen.,and Transvision CRT reactivator andtester, Transvision Sparker, Fieler sig.tracer, Jackson RF sig. gen. Perf. cond.,40% off list. Albert Chonka, 816 Rich -ford St., Duquesne, Pa.

DECEMBER, 1953 Page 21

WANTED - "Recording and Reproduc-tion of Sound" by Howard W. Sams.Will buy if very cheap, otherwise rent.Wayne Sines, R.R. 1, Box 362, Oakland,Md.

FOR SALE - Tube and set tester, RadioCity Products, model 805, good cond.with test leads and instruction book.First $30 takes it. Factory Price $97.L. M. Munger, DeKalb, Ill.

WANTED - Several "old band" FM rcvrs.or tuners. Must be in working cond.and reasonable in price. E. C. Stevens,De Ruyter, N. Y.

FOR SALE - RCA 621 7" TV in goodcond., $30; Philco 7" TV, $25; Teletone 7"TV, $25; Teletone 7" TV chassis less alltubes, $10. A. Ignal, 5325 205 St., Bay -side 64, L. I., N. Y.

SELL OR SWAP - Wurlitzer juke box,plays 12 single side records. Thoroughlyreconditioned, suitable for dance hallor business. Also office intercom.Would like tape recorder or Hi -Fi equip.John's Radio & TV Labs., 199 Olive Ave.,Pompton Lakes, N. J.

FOR SALE - Sams folders, Vol. 1-20, Sets1-200, with binders. Price $175 FOB.Radio Service, 236 Berkshire Ave.,Bridgeport, Conn.

SWAP - Have new 1951 Philco autoradio; L. C. Smith typewriter; radio-phono comb. Want camera, TV set.M. Gianfrocco, 1 Bell St., Providence9, R. I.

FOR SALE - Sams Nos. 67, 79, 93, 113,118, 124, 126, 133, 135, 148, 158, $1 each;Riders TF No. 40, $1.50; Riders Vol. 10,$5. All for $15. W. F. Mann, 3418Sunnyside Ave., Brookfield, Ill.

FOR SALE - Heath Scope, model 0-7(modified to an 0-8), exc. cond. $35.Joseph F. Dineen, 9 Winter Terrace,Westwood, Mass.

FOR SALE - Aerovox model 75, Cap. andRes. bridge, good cond., used, $35;Lyte LTD -5 antenna, used, with extralucite spacer bars, $20. Charles A.Kohl, 94-96 Furnace St., Kingston, N. Y.

FOR SALE - Hallicrafters S-52; Heathkitscope; TU -7-B tuning unit; BC -459-Atransmitter; Radio Altimeter, reasonablypriced. Robert G. Pecina, 839 JerseyAve., Elizabeth 2, N. J.

FOR SALE - BC -348 communications rcvr.with BC -453 Q5"er, $75, local only.Boothroyd, Box 142-G, R.D. 1, Sparta,N. J.

FOR SALE - Riders Manuals 1 thru 12.Brand new cond. George A. Rossetti,Simsbury, Conn.

FOR SALE - 45 rpm RCA record player,PA type, bronzed metal base, $4.50; FM -AM table chassis radio with FM-AM-phono switch, min. tubes, 5" speaker.J. C. Davis, 9014 N. Laramie Ave.,Skokie, Ill.

FOR SALE - Custom-built table modelmahogany cabinet, drilled for RCA 17"rectangular tube TV, 630 chassis, withmask, safety glass, mounting brackets,back board with cup, in orig. carton $25.Edwin J. Manikowski, 1472 N. PaulinaSt., Chicago 22, Ill.

SELL OR SWAP - 3 -element close spacedfolded Dipole Hylite 10 -meter beam withmast, thrust bearing, Alliance TennaRotor and control box. Used but goodcond. $40 cash and carry, or testequip. A. Hellman, 233 Rutledge St.,Brooklyn 11, N. Y.

WANTED - Good used AM -FM tablemodel radio, up to 10 tubes, in goodcond., for cash. M. M. Odil, 1005Princeton Ave., Kalamazoo, Mich.

WANTED - Used ICS correspondencecourses or miscellaneous ICS lessontexts, any subject. G. R. Crapsi, 251No. Ellicott St., Williamsville 21, N. Y.

SELL - EV-10A Precision Apparatus VTVwith RF-10A probe; United Transformercomponents S31, S32, $45, S57, S59,S61; capacitors; TJU 10040; Superior 116UAutotransformer. Make offer. R. E.Cocklin, 2202 St. Elmo NE, Canton, Ohio.

TRADE - Brush PL -20 pickup in orig.carton for good micro -groove arm andcartridge. John C. Strole, Box 417,Rutgers University, New Brunswick, N. J.

FOR SALE - Remington -Rand portabletypewriter, Vibroplex Bug, both in finecond.; 813 Transmitter with 200 w. out-put, needs minute repair. All $100 cash.M. Goldman, 1806 Church Ave., Brooklyn26, N. Y.

FOR SALE OR TRADE - Radio and elec-tronic components and magazines. O.Zetlmeier, 1123 Woodycrest Ave., NewYork 52, N. Y.

Page 22 THE C -D CAPACITOR

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Plants in South Plainfield, N- J.; New Bedford, Worcester and Cambridge, Mass.; Providenceand Hope Valley, R. I.; Indianapolis, Ind.; Sanford and Fuquay Springs, N. C.; and

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Printed in U. S. A.