I auditioned some of the clayton monos several years ago and experienced the same thing in my system. Never did find out what it was because I did not purchase them. They sounded wondeful otherwise
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You may have DC offset on your ac lines which is causing your tranformers to hum. Go to AudioAsylum.com and key in dc offset you will get further explanations on this problem, PS Audio has a Humbuster which removes dc on ac lines, Krell Amps have a humbuster circuit in their amps which removes the dc voltage.
Thank you for your replies, gentlemen - I appreciate the input:
Ehoehn - Interesting! I can't help but wonder if the hum is an idiosyncracy of the Clayton design, perhaps in their earlier renditions such as mine. Hopefully some other Clayton owners will respond and either support or refute this idea. I need to contact Mr. Shen at Clayton for his advice.
Jazzdude - suffice it to say I'm still on the steep part of the curve w/ this hobby (affliction :-) but have read enough posts here on the forum to initially conclude that I was dealing with a gound loop problem. As stated, I have lifted the grounds on the amps, but I'm sure I need to do more investigation in this area. As an aside, I also possess the Sim W5, and have heard it paired w/ the Thiels CS 2.3's in a friend's system - very nice indeed. I bet the addition of the Supratek has really placed your system's sound in the "way sweet" category! The W5 currently resides in its shipping box, awaiting duty as the mains workhorse in our HT sytem, once reassembled. I need to get off my duff, and substitute it into the 2 ch room in order to get another take on the AC delivery. However, I wonder if different components can simply respond differently to the power issue - dumb question I'm sure.
Jejell - DC offset, hmm - I've seen the term before but that's about it. I intend to do my homework over at AA - thanks for that suggestion! I have read a bit on the humbuster, but was hoping I wouldn't have to add anything between the wall and the amps. Less is more, as they say ... but maybe not.
Thanks again, guys ... regards, Tom
Tburn - Sorry that I had missed the part about the you lifting the ground already. Did you try it in only one amp at time, though? I mention this because I had Bryston 7B-ST monoblocks in the house for an extended audition once. And I encountered that that ground loop problem. It was fixed by lifting the ground in one of the amps and leaving the other grounded.
Thanks for the compliment on the system. It has a fullness and liquidity unlike any other that I have heard.