I do not have a Ref Phono 2se but I do have a Ref 5se. All my ARC pieces are dead quite. Transformer hum is not normal. I would try borrowing a power conditioner from your dealer. If that doesn't work then a power regenerator.
Do you have any compact florescent bulbs or dimmer switches? If they are on the same circuit they can cause a hum in your audio equipment. If you do, turn them off and see what happens. My wife put compact florescent bulbs in the dining room. This caused a hum in my preamp. I couldn't figure out why one day there was no hum and another there was. It took me a little while to figure out that the dining room light being on was causing the hum.
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