mc602

Nothing, just keep it away from moisture.

Hopefully, you will live longer than 20 years, (myself as well).  Just use it, Mac equipment is made to last 50 years or more.

I just sold my mc2500. I purchased it in 1987 new. I never even burned out a light in the amp. I kept it in a cabinet. so it stayed clean. A great amp, never let me down. It also had a surprisingly high resale value. Prior to selling the amp, I asked my McIntosh dealer if it was necessary to service the amp. He told me no, that he had seen these amps run longer than this without problems. One note, I was probably in the the lower 8 hours per week range. My new amps are mc601's, love them. I also told my son these would be his one day (I'm 63). He promptly ask me, "how are you feeling?" I know you will always love the 602 until you have to move it.

one of the lights on the right side of one meter went out recently. i would have it replaced but that amp 'weighs' too much to move! LOL!!

NONE...these amps don't require anything, that's why you'll be able to give it to your son and he can give it to his! they are battleships! The only thing is the lights on the front, I'm not sure if they made a LED kit for this amp, ask audio classics. Otherwise you would have to change the Lamps inside if they are going dim (they all do) these lamps are made by a company called Chicago Miniature. Or have audio classics give it a check up and change the bulbs if you want.  AWESOME AMP!

Matt M