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In Reply to: RE: One Channel Hum Affected by Volume posted by mr9iron on March 30, 2025 at 13:46:23
That Scott unit has a power switch on the back of the volume pot. Is it possible that it is inducing hum in the channel closest to the switch?
Follow Ups:
Have you tried reversing the 120v power plug? When the switch is closed, it will be at line neutral or at the full 120vAC, which will affect capacitive coupling to the adjacent volume control.
JRMA
The volume pot is new, however, the replacement is like the original in that the AC switch is mounted to the back of the pot.
I think the best suggestion that has been posted on my thread to tell if pre-amp/volume is in the mix and that back pot is affected, is to swap the the preamp wires that feed the pot.
I think even before I do that just as a curiosity I can chase the leads of that back pot and see if by chance it's the same side. But this is a possibility I didn't think of. I wonder if any other folks have had an issue like this with the pot/switch.
thanks for the suggestions and I will update...
I have the same Scott unit that I use in a second system. I never run the volume past 8-9:00 or it is too loud! Not sure why yours is running at 2-3:00, seems that something is not right there.
I'm getting ready to open mine up because the balance control is giving me trouble that normal deoxit cleaning is not fixing. Maybe we can compare notes :)
JRMA
Update, the rear pot adjacent to the AC switch is actually the clean channel. Good theory though..
JRMA,
Some of this is from my memory, but I believe the reason I reach that full useable volume at that spot, 2:00 -ish is just the physical characteristic of the new volume pot. If I re-call the original pot was more like you described.
The reason for this is because the new pot needs a good amount of clockwise turn to turn the power switch on. The new switch is "turn on -click" - not "pull on" like the original. By the time you click to "on" you are almost at 8-9:00 already with no volume.
So if my memory is right, this would put the "lag" just about where you are stating your volume is. I also think if I re-call, with very inefficient speaker load, 12:00 would be the absolutes max it could run and with efficient loads, right about where you are stating. So I think it's just a physical positioning thing.
Yes we can compare notes, I hope to have more to report...
JRMA,
Some of this is from my memory, but I believe the reason I reach that full useable volume at that spot, 2:00 -ish is just the physical characteristic of the new volume pot. If I re-call the original pot was more like you described.
The reason for this is because the new pot needs a good amount of clockwise turn to turn the power switch on. The new switch is "turn on -click" - not "pull on" like the original. By the time you click to "on" you are almost at 8-9:00 already with no volume.
So if my memory is right, this would put the "lag" just about where you are stating your volume is. I also think if I re-call, with very inefficient speaker load, 12:00 would be the absolutes max it could run and with efficient loads, right about where you are stating. So I think it's just a physical positioning thing.
Yes we can compare notes, I hope to have more to report...
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