edgranholm I'm sorry. Yours sounded like the kind of story I get all too often from non-tech folk who seem to think "It just needs to warm up." After all, you did leave it on long enough to try to play through it. Also, bear in mind that I write my replies as much for the rest of the people who 'look in' as the actual questioner. Not an excuse; an explanation.

The caps are likely to be toast. Exact replacements are unlikely to be new production, meaning that an identical part is probably just as old as the one that failed. New caps are usually much higher values (number of uF), rated for lower voltage. That requires using two or more in series, both to lower the effective value, and to tolerate the higher voltage. That gets tricky, because the caps need to be matched for value in order to ensure that they 'share' evenly.

The rectifier tube may have been damaged by the high current draw caused by the failing filter capacitors. The 5Y3 is a fairly robust SOB, so you may be in luck. Its a common, readily available tube, so no worries, even if you need a new one. :cool:

The (undated) schematic I have, shows only 165 volts being applied to the plates of both sections of the 12AX7 preamp tube. There's enough series resitance between the plates and the supply to be fairly sure its OK. Heavy ripple on this supply line would make a hell of a lot of noise, though! :eek:

Now then, about that 6V6... if the rectifier is letting AC through, the output tube is now a nice souvenir of a bad time. The good news is that you can get them for less than $10 from a lot of online dealers. :)

The power transformer probably got a more vigorous workout than its used to, but if it didn't get too hot, its probably none the worse for wear. Ditto the O/P. ;)

Bottom line? Even if all of the tubes are replaced, they won't cost more than $35-$40. The capacitor bank will have to be hand-crafted, which puts you at the mercy of the tech. You're looking at a couple of hours work, plus parts. If the wiring is original, its way past its 'best before' date! The tech time to replace it costs a pretty penny, but your life is worth the expense, no?

The GA-5 is a nice, simple, low-power amp that should be every bit as famous and revered as the Fender Champion. Let us know how you fare with it.