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Re: McIntosh forum/servicing info

Posted by ketchup (A) on April 10, 2007 at 19:00:00

In Reply to: Re: McIntosh forum/servicing info posted by doodlebug on April 10, 2007 at 17:46:30:

Thanks, Dave. Much appreciated.

I bought this MC-225 and it is in VERY good cosmetic shape. Just a few letters missing here and there, shiny chrome, nice black paint, & original tubes (except one).

Anyhow, I brought it up on a variac and then tried it out with my Jolida JD-100 straight into it. It sounded delicious. Buttery smooth. I was in awe, really. After a few hours I noticed that either the right channel was getting louder or the left channel was getting quieter. The left channel gain had to be raised significantly to get things centered.

I want to find the cause of this. I think I read somewhere that this might be caused by resistors that change value as they warm up. I'm interesting in determining which are the offending resistors and replace them. I also imagine that there are some caps that should be replaced. I'm not sure I want to replace them all right now, but maybe just some of the more crucial ones. I'm not sure how I feel about the possibility of changing the sound of the amp by switching too many caps, but if it's necessary I will. I'm willing to do what it takes to turn this into a reliable, good sounding amplifier that functions as it should.

Thanks again for the info, David. I'll check those places out.

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