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October 11, 2011 - 8:54pm
#1
60Hz Hum - Ground Issue Or Something Else?
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you need to direct this question to mcintosh. if you just spent money with them on the rebuild , then they owe you an explanation.
just off the top of the head, if it didn't hum before you sent it off and it hums now, there is a good chance it is something they did.