1959 Zenith audio issue

[bigaudioal]

Thanks guys. I will check out the audio tubes once again to make sure all pins are clean, all sockets are good and check for any bad solder connections. Will update on if I find anything and if condition improves.

[wa2ise]

Looks like the audio output tube's control grid gets its biasing via the wiper on teh volume control. I've had that go open circuit. I've added a 1meg resistor to the grid to ground to keep the grid fron going open circuit if the wiper contact goes bad. The audio will go missing, but the tube won't "run away" with excessive current.