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Advice re PC for Plinius amp

I have a a Plinius SA-250 and I suspect the massive transformer is creating noise on the power circuit - maybe DC, but I don't know that for sure. Even though I use dedicated 20 amp circuits, all the gear is connected / grounded to this source.

My question is: are there any PC's out there that can block DC or has anybody experience of PC's with Plinius amps and reducing hum back into the system.
radicalsteve

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radicalsteve OP
146 posts
 
thanks for the ideas. Just to be clear (as I clearly was not in my initial post) the hum is not at the amp, it is back thru the system and it gets much louder when I move the amp to class A mode via its selector switch,

I am intrigued by Horseface's suggestion to move to SE IC's - I currently use balanced transparent cable IC's (15' length). I will try SE IC's.
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