2. amps-preamps
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Amp hums when on same circuit as line conditioner

I have a Classe ca-200 which has never hummed before, but I just put a furman voltage regulator/line conditioner in my system, and if the amp is connected into the line conditioner or other socket that the line conditioner is plugged into, the amp hums (the transformer i'm assuming). If the amp is plugged into a different socket(on the other side of the room) and everything else is the same, it does not hum. I've tried all sorts of combinations, and the only way to get rid of the hum is to turn off the line conditioner or to plug the amp in a socket elsewhere. Any clues as to why this is happening?

Jon
crzyjt

Showing 1 response by stehno

stehno
1,453 posts
 
Check to ensure that the circuit the outlet in question is on the same phase/leg back at the service panel.

If it's not, hire an electrician to carefully move the circuits around so that all of your audio outlets/lines/circuits are on the same phase/leg in the service panel.

I had a small transformer hum in my amp and doing the above resolved that issue.

Of course, that does not mean it works every time. But it never hurts to arrange your audio circuits this way anyway.

-IMO
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