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In Reply to: McIntosh 2100 hiss posted by eedork on March 30, 2007 at 20:30:34:
I have the 2105 that is the metered version and I get no hiss from it. 1st make sure it is form the amp. Disconnect the input and turn the amp on and turn the level controls full up see if it is full quite. Also, try it with a set of shorting plugs and see if there is a difference. If not hiss, then it is not the amp. Remember these amps are 30+ years old and probably time for some tlc; especially the caps.
Follow Ups:
I should go through it and replace some of the caps - just have to figure out if I want to do it or if I should send it off to Audio Classics or DeWick. The 2100 is real easy to work on, so I can't imagine it would be all that expensive if I decided to have a pro do the work.When I had it apart I was measuring various power supply voltages that were about 10% higher than what was stated in the service manual. I assume this is due to my wall voltage being 123VAC (the 2100 is rated for 117VAC) causing an increase in operating voltages throughout the amp. I don't know if the 2100 is designed to operated within these limits or if I should build a step down box (with a power switch and NTC thermistor) for the 2100 to bring the AC mains voltage down to ~115VAC. Having a switch alone is worth the trouble in building this, and I have all of the parts already.
I recently discovered an absolutely superlative tech (and great guy to boot) named Russell Barone. Years ago, Russ was the second man at Perdue Electronics' service department, and was the beneficiary of McIntosh factory training (though he will happily work on other brands, too-he's about to restore my Perreaux 2250B). His rates are unbelievably reasonable, and your 2100 will be returned to you working to spec and in immaculate condition. He's located in Nutley, New Jersey: russellsonny@verizon.net. Tell him Henry Summers sent you.
I'd suggest checking with Terry. The amp is well laid out and should be easy to work on but there may have been silent recalls or in-production running changes that yours does not have.
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