@mikegris, depending on how much experience and knowledge you have in electronics, the first thing to keep in mind is *safety*, because tube amps can have lethal high voltages inside. Otherwise, get as much info on the amp, like schematics, part numbers and values, others who have worked on these amps, etc.
Your last sentence reminds me of the phrase "What could possibly go wrong?". Good luck and be safe.
Your last sentence reminds me of the phrase "What could possibly go wrong?". Good luck and be safe.