A friend give me this radio with an external Sonora speaker. Outside is very scratch, but inside look new with all tubes. 5 Cunningham C-301-A and 1 Radiotron UV 200. All short pins tubes with a little pin on the side that click on socket. The inside is very strange, don't look like my other radios.

I would like to have informations about it. Battery radio? Do I have the good tubes for it in the right socket? Maybe someone have schematic?

Thanks a lot!
J-F

Hi J-F

Here are Amrad schematics:

http://www.nostalgiaair.org/Resources/029/T0000029.htm

http://www.nostalgiaair.org/PagesByModel/376/M0039376.pdf

If you don't find what you want try Stewart Warner 300 series. There are several on this page that cover battery radios from the 1920's.

Your UV200 is the detector tube. The detector should have 22 1/2 volts or less on the plate, pin #2. Others can use 67 1/2 or 90 volts on pin #2. Filament needs to be around 6 volts. Voltage is reduced by rheostats on your radio. All others tubes will be versions of 01A. Cunningham called them C301A, RCA UV201A. Your tubes have short pins so require sockets which use a bayonet pin.

Norm

:A friend give me this radio with an external Sonora speaker. Outside is very scratch, but inside look new with all tubes. 5 Cunningham C-301-A and 1 Radiotron UV 200. All short pins tubes with a little pin on the side that click on socket. The inside is very strange, don't look like my other radios.
:
:I would like to have informations about it. Battery radio? Do I have the good tubes for it in the right socket? Maybe someone have schematic?
:
:Thanks a lot!
:J-F