2. amps-preamps
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Hum or buzz through speakers

I just turned over my system from all B&K to Audio research and McCormack. I was running the Audio Research through the B&K until Monday when I put the McCormack DNA-1 in place. I am hearing a hum or buzz through my Vandersteen's audible from three feet away. Preamp is ARC SP9MK2. Tubes are 6922 Golden Dragons which I am going to change over to some Amperex 7308 USN-CEP. Would this be tube noise that perhaps the McCormack is picking up where the B&K did not or is there something in the McCormack amp that would cause this.

Eagleman
eagleman6722

Showing 1 response by restock

restock
831 posts
 
I had a 60Hz hum in my system due to an antenna/cable connection, when the TV was connected to my Jolida amp. The TV cable had a ground that is different from the electrical ground thus resulting in a ground loop.

Best way to find out is to disconnect all ICs from your amp but leave the speakers connected. If you still hear hum then it might be a problem with the amp. Then slowly start connecting one piece at a time, so that you find the faulty piece.

Good luck.
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