In Reply to: Thanks to responders. posted by PeterI on January 10, 2016 at 12:03:30:
Usually, when trying to track down this sorta thing, you find the magic 'trick' that solves it. Not this time, but it is better. There are about 25 ground points, circuit to the chassis. And I think this is endemic to all the cheap parts in this amp: power transformer internals, open-frame OPTs, pots, etc. I tried all the suggestions, thanks. As long as you don't turn up to full volume the buzz isn't really noticeable.
Edits: 01/12/16
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Follow Ups
- Problem persists. I'm done with it. - PeterI 09:49:54 01/12/16 (12)
- RE: Problem persists. I'm done with it. - Crazy Dave 11:32:10 01/12/16 (0)
- Your hum is in the signal path because it changes with volume - Michael Samra 11:30:32 01/12/16 (10)
- RE: Your hum is in the signal path because it changes with volume - PeterI 13:41:09 01/12/16 (9)
- Heater lines - FenderLover 10:53:22 01/13/16 (8)
- RE: Heater lines - Michael Samra 12:00:03 01/13/16 (7)
- RE: Heater lines - Crazy Dave 13:43:06 01/13/16 (2)
- RE: Heater lines - Michael Samra 18:25:43 01/14/16 (1)
- That sounds like a recommendation to me! (nt) - Crazy Dave 07:15:42 01/15/16 (0)
- RE: Heater lines - PeterI 13:38:32 01/13/16 (3)
- Input lines - FenderLover 18:32:54 01/13/16 (2)
- RE: Input lines - PeterI 10:46:48 01/14/16 (1)
- RE: Input lines - DannyR 12:31:54 01/14/16 (0)