I have recently bought a Marshall jtm 60 tube amp off eBay and was wondering what mods I can do to fix the problems people seem to have with these amps, so I can prevent any damage to the amp
What is wrong with the amp? I always though mods should be done when the amp is already up and running?

Btw, absolutely love the Hendrix/SRV quote.
there have been people that have said that there amps overheat and in some cases melt the circuits so i want to take some preventative action to stop these things in the small chance that they happen, its my first tube amp so i want to protect it and make it last a long time