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RADIO BROADCAST ADVERTISER
313
Build the best —
Socket Power Devices
— A and B Supply Devices Power Amplifiers Impedance Amplifiers
And are best —
For Filter Uses Rectifiers By Pass Blocking D. C.
American made of best of materials to full capacity. All sizes and types. ^
POTTER MFG. CO.
North Chicago, III.
f Bradte^deak ij
-i THE PERFECT GRID LEAK
Provides a noiseless range of grid leak resistance from \ }4 to 10 megohms. Assures "■ most eSective grid ? leak resistance value for all tubes. % Small grid conden ? ser (0.00025) is sep 'I arate. Metal parts % nickel plated. One ^ hole mounting.
Electric Controlling Apparatus "i 278 Greenfield Avenue Milwaukee, Wis. J
vv.v.v.v.v.v.w.v/.v.v.vv
Automatic Which do you want ?
Low Cost
Electrically identical with higher priced models. Five minutes work installing this Utility Type Switch saves you at least $1.50. Complete instructions make it easy to connect to binding posts. Only one installation is necessary. Requires no attention again.
Retails at $2.00 to $2.50
Model 13— This model, shown above is identical electrically with Model 23 but is without cord and plug or receptacles for Charger and Eliminator cords. For use with sets using from 3 to 8 Type 201-A tubes or their equivalent in amperage drain. Retails at $2.00. Model 14— Identical electrically with Model 24 except that it is without cord and plug and receptacles for ChargerandEliminator cords. For use with sets using from 5 to 10 Type 199 tubes or their equivalent. Retails at $2.50.
For the man who doesn't like to "tinker", the convenience Models have plug Connections for B Eliminator and Trickle Charger with cord and plug for light socket. Connections are as easily made as plugging in an electric light.
Retails at $3.50 to $3.75
Model 23 — This model illustrated above, is complete with cord and plug and receptacles for connection with Trickle Charger and B Eliminator Cords. This model is for receiving sets using 3 to 8 Type 201-A tubes or their equivalent in amperage drain. Retails at $3.50.
Model 24— Same construction as Model 23 but is intended for use with sets using from 5 to lOType 199 tubes or their equivalent in amperage drain. Retails at $3-75.
Either Type Switch will make the A Battery switch on your receiving set, automatically turn on and off, either or both the Trickle Charger and B Eliminator as required.
Ask the nearest radio dealer to show you these newest -^L necessities of radio, or if he cannot take care of you, ^\ order direct, giving dealer's name on the coupon below.
THE RELIABLE PARTS MANUFACTURING CO.
2831 Prospect Avenue Cleveland, Ohio
Reliable Automatic
Power Control Switch
Reliable Parts Mfg. Co. Cleveland, Ohio
I would like to have one of your Reliable Automatic Switches.
My Dealer is_ My Name
$2.00
□ No. 13
$2.50
□ No. 14
$3.50 $3.75
□ □ No. 23 No. 24
.My Address.
Fully guaranteed. Money returned if unsatisfactory for any reason. Sent C. O. D. if desired.
Examined and approved by Radio Broadcast
F I X ED™"" CONDENSERS
are Specified in
L C ^ 27 by L M. Cockaday
Diamond of the Air " Herman Bernard
So be announced sooni?) " John Rider Raytheon "B" Eliminator Raytheon Mfg. Co. Ultradyne " R. E. Lacault
3obc annownced soonC?) E* Lacault
AEROVOX fixed condensers have been approved by M. I. T. and Yale Universities.
AEROVOX WIRELESS CORP.
489-491-493 Broome Street, New York