mc602

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

One extra bit of McIntosh lore:  They have no record of a catastrophic failure or unrepairable condition in any of their amps.  Ever.

Quite a testament to their design and build quality. Legendary, indeed!

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!!

That's why I had kids in the first place - to help me move my monoblocks.  They'll get my systems when I'm gone, but I figure they are building sweat equity as part of the inheritance! :)

many thanks for the responses. since i'm planning on keeping it forever, is there any negative issues that i should know in the long run??

Yes...it's too heavy to take to the beach. I can't think of any other negatives.