Quote:
Originally Posted by Volitan
but I don't know if I should just change the Pre-tubes just because I've heard that Power tubes last longer, so I'm assuming they're still fine...
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You've got it backwards.
Preamp tubes can last seemingly forever. I have a Telefunken from '67 (with a lot of miles on it) that I just put in a new build. It sounds great, IMO.
New production power tubes are good for roughly a year or two, depending on usage. If they are current production, biased hot, and used regularly, it's probably time for a fresh set.
If your highs are going, it's probably your power tubes.