Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.

:Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.

A PDF schematic can be emailed but I will need your email address.

Ed.

I seem to get radio on all settings of the selector band switch. I'm assuming last position furtherest clockwise would be the phono.

:Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.

I hooked up an audio generator to the needle of the phono and was able to push an audio signal through the speaker, with volume up to max. setting. I'm beginning to think the amplifier is weak, but with the cartridge able to pass an audio signal, would this indicate that condition of the cartridge is acceptable?

:Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.

Hi Brian:

If you are trying to verify the operation an audio amplifier from the cartridge, the audio signal generator should be connected to the wires at the back of the cartridge, not the needle. It should require very little signal to overload the amplifier.

A phono cartridge transforms mechanical vibrations picked up by the needle as it passes over grooves cut in a record to an electrical signal. The needle provides the mechanical interface and is electrically isolated from the audio circuit.

Gary

:I hooked up an audio generator to the needle of the phono and was able to push an audio signal through the speaker, with volume up to max. setting. I'm beginning to think the amplifier is weak, but with the cartridge able to pass an audio signal, would this indicate that condition of the cartridge is acceptable?
:
::Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.

Thanks for the e-mail. I was able to open up the old Astatic cartridge and replace with a newer component. It now works, especially good on later vintage 78s.

:Hi Brian:
:
:If you are trying to verify the operation an audio amplifier from the cartridge, the audio signal generator should be connected to the wires at the back of the cartridge, not the needle. It should require very little signal to overload the amplifier.
:
:A phono cartridge transforms mechanical vibrations picked up by the needle as it passes over grooves cut in a record to an electrical signal. The needle provides the mechanical interface and is electrically isolated from the audio circuit.
:
:Gary
:
:
::I hooked up an audio generator to the needle of the phono and was able to push an audio signal through the speaker, with volume up to max. setting. I'm beginning to think the amplifier is weak, but with the cartridge able to pass an audio signal, would this indicate that condition of the cartridge is acceptable?
::
:::Looking for a schematic for a radio/phono, Canadian General Electric, late 1940s vintage.