I have a situation/question to pose to the collective wisdom of TB. Last year, I grabbed a very clean Fender Studio Bass amp (just the head). 200w of all tube goodness built by Fender in the late 70's. So, this amp is at least 35+ years old. I bought it used (of course) and it clearly had some work done on it at some point, but I wouldn't guess that it had a cap job done since its birth in Fullerton. Now, the amp works and sounds great, no buzzing or any real hum, and it seems to kick out the volume just fine. I did replace the 6 original RCA 6L6GC power tubes that came with it, and then had it rebiased with a sextet of Ruby 6L6GC STR's. When it was opened up for the retube work, the tech and I got a good look at the amp guts, and neither of us saw any swelling or sweating on the caps. There was one that looked somewhat scorched, but the scorching could have easily been a cosmetic result of the original power cord shorting out (I seem to recall that this particular cap was very near the hot/ground wires that looked as if there had been an issue of some sort in the past). My question is: should I just go ahead and have it checked out and recapped, or should I leave well enough alone and go with "it sounds good, it must be ok" ? I'd really hate to have it worked on and discover that I liked it with the original caps better, because it sounds really good now. and ... discuss!