OK, no bites ;-)
I do not know why the amp was losing power (volume would drop 10+db in the middle of a gig), and I would like any advice on what to look for. The amp had all resistors, caps and diodes replaced about 15 years ago (it was pretty much completely rebuilt) and probably has not had more than 200 hours of use since then. I am now in france, so I have two problems: 1) I'm using an external 300watt stepdown transformer to power it. is 300w enough? 2) It makes no sound now, although the tubes do seem to warm up.
As I said before, I am good with a soldering iron, and multimeter. I can also follow directions. Where should I start??
Thanks for any help.