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hum through both speakers; AC regenerator

Hi,
Was troubleshooting 60 Hz hum coming through both speakers, though not audible at listening position, and music sounding pretty good. Have a vacuum tube linestage (Vacuum State FVP5, BEL power amps, Genesis Tech IM-8300's. All components were plugged into an Exactpower EP15A. After swapping out preamp tubes, re-routing interconnects -- no improvement. Finally disconnected the power amps from the Exactpower and plugged directly into wall. Hum now GONE, and the transformers of the preamp and power amps are now MUCH quieter.
I've been using the Exactpower for quite some time, and the increase in hum level is recent. Any ideas/suggestions? (My turntable is also plugged into the Exactpower, which should result in better speed stability, but...)
Thanks,
Harvey


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Topic - hum through both speakers; AC regenerator - unchilled 08:59:27 08/27/12 (2)

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