Posted on 
May 20, 2006 09:38 pm capacitors can go bad. Some quicker than others, depending on the quality of build of the caps, and other strange phenomenon.
I'd replace those power caps first. Someone handy at soldering can replace them in an hour or so.
Oh yeah, that's not static you discharged. Probably most of the 400 or 500 volts DC they're meant to smooth out. That's what filter (or power) caps do: they take out the ripple left behind by converting AC power over to DC power. After the conversion, there's a ripple in the DC power, so the caps smooth out the ripple by taking in the charge, and letting out some at the right time.
If you're looking to buy replacement caps, be as close to the MFD rating (probably around 50mfd or so) as you can. You can get the voltage rating over what's in there (like if the ones in there are 500vdc caps, then you can replace them with 550vdc caps), but don't go crazy and go for double the rating.
Mouser has always been a great spot for electrolytic caps. I'm partial to the sprague line. Each should be around 5 or so dollars a piece. Without looking, you may need only a couple, or maybe 5 or 6. I'd have to look at a schematic.
If your not savvy in soldering / electrical safety, by all means, take it to a respectable tube amp repair shop. Don't be unsafe again. Filter caps can kill you if you're grounded right.
HTH.
