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Old 19th March 2006, 11:31 AM   #11
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Join Date: Mar 2001
Location: USA
If it's a faint hum, my guess is that you're hearing a small ground loop between the amp and your signal source. In this amp, it's normal for the hum to be slightly louder in one channel than the other, as one is isolated from chassis by a 10 (?) ohm resistor while the other (probably the slightly noisier one) is not.
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Old 2nd April 2006, 08:37 PM   #12
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Join Date: May 2003
A few weeks ago I got a new preamp and hooked everything back up, and the 1A was dead quiet in the right channel, but had a slight buzz in the left (my tweeter and mid buzz, very mild 60Hz hum in woofers). It was quite cold in here when that was going on. Now, it is about 10-15 degrees warmer in here and the right channel is still reasonably quiet, but the left channel is buzzing like crazy. The heatsinks are much warmer because the ambient temperature went up so much more in here.

Is there an easy fix for the left channel to get it to quiet down? It is now audible at my listening position and is very frustrating... Thanks
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