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RE: Tube amplifier hum

Posted by Palustris on May 20, 2017 at 08:57:45:
This is clearly a grounding issue. You don't mention if the headphone amp has a grounded power cord, but is seems as if it is not properly grounded. When sitting on the other equipment it is possible the other equipment is providing the ground; it could even be the CD player that is providing the ground through the SS amp upon which the headphone amp is sitting.