12-08-2025, 04:36 PM
Hello Mikeyg and welcome to the Phorum.
Here's a link to the schematic for your radio:
https://philcoradio.com/library/download...20Book.pdf
You'll want to attempt to isolate the problem between power supply, radio circuits and audio circuits. Start by checking the B+ voltages at the power supply output. If the voltages are OK then measure the plate voltages of each tube. If these are OK then touch the center terminal of the volume control with a screwdriver. You should hear a hum from the speaker. If no hum, then there could be a problem in the audio section. If you hear a hum then there's likely something wrong in the rf circuits. See what you can determine from this.
Here's a link to the schematic for your radio:
https://philcoradio.com/library/download...20Book.pdf
You'll want to attempt to isolate the problem between power supply, radio circuits and audio circuits. Start by checking the B+ voltages at the power supply output. If the voltages are OK then measure the plate voltages of each tube. If these are OK then touch the center terminal of the volume control with a screwdriver. You should hear a hum from the speaker. If no hum, then there could be a problem in the audio section. If you hear a hum then there's likely something wrong in the rf circuits. See what you can determine from this.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
