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RE: McIntosh MA6100 repairs

I used MJ15003G, the same shipped by McIntosh.

There is one further thing I've noticed. After playing music for a couple of hours, one channel's heatsink is still warmer than the other. All DC measurements I can take between the two channels have them very close to one another. The only difference I can find is that on Q405 on the warmer channel, I measure about 22Megohms between base and emitter. On Q406 on the other channel, no resistance registers on a Fluke DMM.

At idle, there is no difference.

Unfortunately, no generic transistor cross seems to be known for Q405/406 (132-081), meaning I'd have to order from McIntosh, which takes about 3x as long as ordering from Mouser.


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