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McIntosh MA6100 repairs

I've just completed several repairs on a McIntosh MA6100, the first one I've worked on, including replacing output transistors and bias control transistors in one channel with replacements sourced (by request) from McIntosh. This has been one of those whack-a-mole repairs where as soon as you think you're done, something else pops up.

I've been playing it for a while to verify that all is well, and I've noticed that the left channel heatsink with original output transistors gets warmer than the right channel heatsink with new output transistors. The right channel, the one I just repaired, stays fairly cool. I also swapped driver PCBs just to see what would happen, and the left channel heatsink remains warmer. Both channels have been bench-tested at full power into dummy loads.

Should I be concerned about original output transistors in one channel running warmer than new replacements in the other?

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Topic - McIntosh MA6100 repairs - Thermionic27609 14:40:21 04/08/17 (11)


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