07-13-2015, 08:36 PM
The schematic in nostalgia air is tough to follow, BUT:
1. No, the power to the turntable is house current, switched.
2. If half the tubes are reading ? then that could be the problem.
PM me with what tubes are bad, I may be able to help.
Once you KNOW all tubes are good, then we can start troubleshooting.
If your sig gen has an audio output signal you can use separately or modulate with an RF signal, recommend this:
1. Inject an audio signal on the wiper of the vol control. If you hear it in the speaker and can control the volume by turning the vol control shaft, then trouble probably not in the audio section.
1. No, the power to the turntable is house current, switched.
2. If half the tubes are reading ? then that could be the problem.
PM me with what tubes are bad, I may be able to help.
Once you KNOW all tubes are good, then we can start troubleshooting.
If your sig gen has an audio output signal you can use separately or modulate with an RF signal, recommend this:
1. Inject an audio signal on the wiper of the vol control. If you hear it in the speaker and can control the volume by turning the vol control shaft, then trouble probably not in the audio section.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
