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That is a ground loop. You have a cold ground joint somewhere. nt

172.11.32.65

In Reply to: RE: One Channel Hum Affected by Volume posted by mr9iron on March 30, 2025 at 13:46:23

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RE: That is a ground loop. You have a cold ground joint somewhere. nt - mr9iron 12:26:34 04/01/25 (1)
Chip,

I believe you are right, trying to find it is the big chore. I am trying to narrow down where it could be. So far I have narrowed to A channel pre-amp section before the volume control at c20. I am slowly working my way back trying to find it.

Jeff
- RE: That is a ground loop. You have a cold ground joint somewhere. nt - Chip647 14:30:23 04/01/25 (0)
  They can be buggers to find as seemingly "good looking" joints can have problems. That it is around the volume control section narrows it down quite a bit. Ground all of the shields on the input RCAs together and tie them to a good central ground. Ground your volume control to the same point. The input tube grounds should be at this point too. This will trap the volume control hum problem somewhere in this area. The volume control itself should be looked at.

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