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In Reply to: Tube amplifier hum posted by lesleymorley@yahoo.com on May 19, 2017 at 13:23:19:
Sounds like a ground loop inside your tube headphone pre-amp. Maybe between grounding points of input ground and the grounding of the power supply.
You'll prolly need to play with the grounding scheme or add a star ground to the unit.
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Follow Ups
- RE: Tube amplifier hum - FenderLover 08:34:26 05/20/17 (0)