Fairbanks Morse 21"

[Hexar]

Originally Posted by jpdylon

If you have a scope, see if you can find sound at the grid of the audio amp. If no sound there, trace backwards until you see it. A schematic is helpful here. If you're lucky the sound is out of alignment or you have a dead audio detector tube -usually a 6AL5.

Thanks Jpdylon, good advices. I have swapped out a couple of 6AL6 last night, the sound is a little "louder" now, I can make out the conversation if I stick my ear against the speaker... haha I also swapped out the 6AV6 and a 6AU6A, not much difference, I will check today to find out if I missed any caps...