Just had a look at the schematics of the 50/50, don't see anything weird about that amp What is the problem with it, maybe I can help?
Yeah well I knew it would be no problem for you, a guy with proper credentials when it comes to music equipment
Oh there is no issue, but I don't know anything about tube amps so given it's age I figured it might be worth while having the amp serviced.
So what the guy claimed was that Peavey would get 50 watts out of tubes that were usually only designed to get 30 watts therefore pushing the tubes harder and causing them to got very hot.
I replied with "that would explain the fan inside". I said that to make him feel better because I'm pretty sure it's not uncommon to see fans in power amps. At least in my time I've found lots of amps with fan in them, including my old AVT150 had two fans in it. But that's besides the point.
So he was too chicken to look at my amp.
I can't say for sure but I think my version of the classic 50/50 is from the 80's.