I finally was able to get the direct drive motor to work perfectly, the phono has what appears to be an amp, driven by one tube, a 12A7. What is confusing, is there is a braided wire that would seem to be an RCA jack to plug into a radio, but usually those are not with a phono that has an amplifier. There is no speaker or model#,but the cartridge is webster, 1938. If it is wireless, then why is there the wires? I am confused with this unit. Any suggestions are appreciated.

Is there a model # for the unit?

Thanks
Lou

:I finally was able to get the direct drive motor to work perfectly, the phono has what appears to be an amp, driven by one tube, a 12A7. What is confusing, is there is a braided wire that would seem to be an RCA jack to plug into a radio, but usually those are not with a phono that has an amplifier. There is no speaker or model#,but the cartridge is webster, 1938. If it is wireless, then why is there the wires? I am confused with this unit. Any suggestions are appreciated.
:

:Is there a model # for the unit?
:
:Thanks
:Lou
:
::I finally was able to get the direct drive motor to work perfectly, the phono has what appears to be an amp, driven by one tube, a 12A7. What is confusing, is there is a braided wire that would seem to be an RCA jack to plug into a radio, but usually those are not with a phono that has an amplifier. There is no speaker or model#,but the cartridge is webster, 1938. If it is wireless, then why is there the wires? I am confused with this unit. Any suggestions are appreciated.
::
:
:
No, I believe that what someone did is take a popular science kit from 1939 for a one tube oscillator (12A7) and somehow connect it to a webster phonograph. I located this oscillator "kit" on line the other day and it resembles my unit. It has a flip switch, a volume control, the tube, a few resistors, capacitors and the line cord along with this cloth braided wire which is enclosing two wires. The "kit' seems to show the two wires going to an earphone headset. Does this claify?

:OK Dave

Could the RCA jack be a connection for an outside wire ( antenna)? If this is a phono oscillator then you have to get the signal out somehow!

Thanks
lou

:Is there a model # for the unit?
::
::Thanks
::Lou
::
:::I finally was able to get the direct drive motor to work perfectly, the phono has what appears to be an amp, driven by one tube, a 12A7. What is confusing, is there is a braided wire that would seem to be an RCA jack to plug into a radio, but usually those are not with a phono that has an amplifier. There is no speaker or model#,but the cartridge is webster, 1938. If it is wireless, then why is there the wires? I am confused with this unit. Any suggestions are appreciated.
:::
::
::
:No, I believe that what someone did is take a popular science kit from 1939 for a one tube oscillator (12A7) and somehow connect it to a webster phonograph. I located this oscillator "kit" on line the other day and it resembles my unit. It has a flip switch, a volume control, the tube, a few resistors, capacitors and the line cord along with this cloth braided wire which is enclosing two wires. The "kit' seems to show the two wires going to an earphone headset. Does this claify?
:

::OK Dave
:
:Could the RCA jack be a connection for an outside wire ( antenna)? If this is a phono oscillator then you have to get the signal out somehow!
:
:Thanks
:lou
:
::Is there a model # for the unit?
:::
:::Thanks
:::Lou
:::
::::I finally was able to get the direct drive motor to work perfectly, the phono has what appears to be an amp, driven by one tube, a 12A7. What is confusing, is there is a braided wire that would seem to be an RCA jack to plug into a radio, but usually those are not with a phono that has an amplifier. There is no speaker or model#,but the cartridge is webster, 1938. If it is wireless, then why is there the wires? I am confused with this unit. Any suggestions are appreciated.
::::
:::
:::
::No, I believe that what someone did is take a popular science kit from 1939 for a one tube oscillator (12A7) and somehow connect it to a webster phonograph. I located this oscillator "kit" on line the other day and it resembles my unit. It has a flip switch, a volume control, the tube, a few resistors, capacitors and the line cord along with this cloth braided wire which is enclosing two wires. The "kit' seems to show the two wires going to an earphone headset. Does this claify?
::
:
:
I didnt think of that before. I tried to connect it to a radio and nothing happened on the antenna or phono jacks. i will see if an antenna connection does something.

If I were you, I'd open the thing up and study where the wires go. This would be a simple indicator as to their function. If they connect to the second control grid or to the volume control or to the cartridge, they are either for feeding in audio from an external source or for listening to the cartridge through a high impedance headset, or possibly for connecting the cartridge directly to the phono input that is provided on the back of some radios.

If the jack connects to a coil or to the plate circuit of the 12A7, then its purpose is most likely an antenna connection.

If the unit does not function, I would check paper capacitors for leakage and electrolytics for leakage and capacity. ...And, after that, check the tube and resistors, and then coils. ...And, of course, the phonograph cartridge. If salt crystal, these often go bad with age.

T.

Sorry. I just assumed that the 12A7 was the same as the 6A7, which it is not. However, if the cable in question that connects to the RCA jack connects to the audio portion of the circuit, then it serves one of the three purposes I listed for that, and if it connects to the RF portion, then it serves as an antenna connector.

As there are several different ways to wire a pentode as a modulated oscillator, I cannot specify which grid the audio connections should be made.

If, by chance, the circuit does not contain any RF circuitry, then the tube could simply serve as a preamplifier, depending on the cartridge used. More likely it is a transmitter, though.

T.