Having a little work on a Fender PA100 and seeking some advice.
Amp is from a friend who bought this, I believe it was not starting up at the time of the purchase. He told me it keeps blowing the fuse.
Mains transformer was blown. Replaced mains transformer, recapped and new output valves. Sound is coming out of all channels.
However... I adjusted the hum balance pot and it went toast. I replaced it and once more upon adjusting it burns up.
It seems like some heater short is occurring. I measured continuity on the valves and no heater shorts are present.
What would cause the hum balance pot to go toast like that? Any advice on how to proceed is welcome.
Pink highlighter is what has been replaced so far. Green to point out hum balance pot.
Amp is from a friend who bought this, I believe it was not starting up at the time of the purchase. He told me it keeps blowing the fuse.
Mains transformer was blown. Replaced mains transformer, recapped and new output valves. Sound is coming out of all channels.
However... I adjusted the hum balance pot and it went toast. I replaced it and once more upon adjusting it burns up.
It seems like some heater short is occurring. I measured continuity on the valves and no heater shorts are present.
What would cause the hum balance pot to go toast like that? Any advice on how to proceed is welcome.
Pink highlighter is what has been replaced so far. Green to point out hum balance pot.
