Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

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RE: McIntosh MA6100 repairs

Posted by Thermionic27609 on April 15, 2017 at 08:56:14:
As a follow-up. I thought all was well, but I started to see upwards bias creep on the left channel, the one I'd just repaired. It was still running warmer than the other channel the longer it ran.

Ultimately the solution had to do with the PCB sockets on the chassis. I noticed that some of the contacts had been pushed apart, and one thing I was told about this amp was that it was damaged by rough handling in shipping at some point. I got out my tube socket tools, retensioned the contacts, and cleaned them thoroughly. Everything is stable now.

My sense about these is that though they are ruggedly built, they need a good bit of detailed service at this point to return them to reliable operation. Integrated amps and preamps of this era are full of features we don't need anymore and, thus, have lots of switches and controls in the signal path.