Rapid pulsing/ throbbing noise


Hello, I recently made my move to SC and finished my set up in my new place.
I encountered a rapid pulsing/ throbbing noise in the phono section in my right channel only. This noise is only at very high volume and the only way I can hear it is to turn my volume up most the way (at about 4:00 position) without a record playing. Now I never listen at that level (max about 12:00 - 1:00) but nonetheless, it's still there and never was before. All I did so far was to change the interconnects and ad an additional grounding wire from my pre amp to phono stage. Any clue as to what might be causing this?
markpao

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