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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
turbofun
6 posts
 
Try reversing the polarity on your amp. You may also have
a grounding loop.
elevick
2,636 posts
 
Some conditioners can't work properly unless on a grounded 3 prong outlet. I know that I had a monster conditioner that stayed in protection mode but my adcom works fine. Contact furman. You may have to get a different conditioner. By the way, for safety purposes you can remove the old outlet and put in a GFI without a ground. This will eliminate the use of a cheap adaptor and can save things in case of a major fault.
wnegele
2 posts
 
I agree with joebrams. I had the same problem with my Audio research amp. Remove it from the power conditioner.
bob_bundus
1,834 posts
 
whatever you do, do not install any type of GFI protector. These are the 2nd worst noise producers around, aside from many cheap light dimmers.
Having no connection to earth ground is a likely cause of the symptoms however.
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