Thanks for all the suggestion. I won't be able to dive into it until tonight at the earliest. Filter caps are F&Ts and all were replaced when I got the amp about three years ago. Bias caps were done then too. PT and OT are stock original. The amp smelled hot at practice yesterday, but nothing like rotten eggs or anything more than, well, a hot amp. There was certainly no smoke and I can't see any obvious trauma when looking over the board. I have a multimeter and know how to solder. I have a weird job, but if I have a good day out in the field today, I can stay home tomorrow and do paperwork and tinker with this amp.