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I've met Amirm, he's not going to be intimidated. I feel sorry for EA's lawyer friend.

Does anybody have a "Cliff Notes" version of this long thread? I just returned from the eclipse and I'm way way behind. :cool:

Best shot yet. Just the way I saw it in Dallas. Got uber lucky, the clouds cleared just before the first diamond ring.

Yamaha of the US would also demolish problem child units. That way they couldn't be resold and potentially sully the brand name.

ClassG33 wants it replaced so calling the dealer/distributor is the best route. A tech would not have the authority to do that.

Call McIntosh's Tech Support line (607)723-3512 ask for Chuck Hinton(Tech Support) or John Messemer(Service Manager). There maybe other techs there that could help too.

Does the noise change if you turn the LED meter lights off? In any case, it would be best to talk to John or Chuck at McIntosh service.

In our shop we use to call bizarre problems like this "good ones". Has the OP tried moving the amp down to the floor or into the lower cubby hole?

A service shop with a bit of repaired vintage equipment sales can work as a retirement gig. That's what I did for 12 years before I fully retired.

Still too expensive for most repair shops. A QA403 would be a better fit.

Also check the resistors around the driver and output transistors. They are marked with an exclamation mark within a triangle on the schematic.

I have outputs to win, dual emitter resistors to place and output Zobel resistor to show. "No problem found"/ firmware update as a 50 to 1 long shot but closing fast. ;)