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Original Message
RE: SET Headphone amp
Posted by Paul Joppa on August 3, 2016 at 10:12:49:
The hum pot can only cancel the 60Hz, as you have said. The 120Hz remains untouched. If the 120Hz is in fact coming from the filament, then either DC or one of the more exotic high-frequency AC will be needed.
But there are other possible sources of 120Hz hum. Inadequate power supply filtering is one example. If the hum has a buzzy character it is likely to be capacitive coupling between power transformer windings, or ground loops.