airline15

[Reece]

Where is that volume control wired in? If it operates filaments at all, sometimes it only adjusts those on an RF tube or two.

Hard to figure it out long distance without a schematic. Time to signal trace. Touch your plugged-in soldering iron to the grid terminal of the output tube. Should get speaker hum. If not, check everything from there to the speaker. Then touch grid of first audio tube and see if you get louder hum. Get the audio section working first.