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In Reply to: RE: With single-ended stuff posted by Cut-Throat on April 20, 2021 at 10:15:03
I had always assumed that a GFCI needed a ground to detect a fault.
Follow Ups:
Yup, I've battled ground loop issues for over 15 years... I have 115db Oris Horns and 45 SET Monoblocks, so any noise at all whether from a ground loop or a noisy tube will show up. My system is Silent Now.
I tried solving the ground loop problem the 'conventional ways', and improved it, but could not achieve the silence that I have now. The resistor on the amplifier input, which you referred to, did reduce it quite a bit on on one pair of 45 amps that I had, but did nothing on another pair.
The more I studied this problem, the more I found out that very few people really understand it. It only takes a few milivolts on an amplifier different from another component (preamp for instance) and my 115db horns will produce the sound that my amplifiers amplify. Is a ground truly zero volts or could it be .0001 volt -- My Oris Horns know.
The resistor on the amplifier input, which you referred to, did reduce it quite a bit on on one pair of 45 amps that I had, but did nothing on another pair.
I didn't mention it being at the input FWIW. But we do use this technique.
If it didn't work on one channel, it might be because something was grounding where it shouldn't have been in the other pair of amps? Its logical to assume that if it worked on one pair of amps that an identical pair would behave the same way. That they didn't suggests they were not identical...
No these were completely different Monoblocks... And it did not eliminate all of the hum, but reduced it quite a bit on both channels... When I got the new pair of Monoblocks, it had no effect on either channel. (i'm on my third pair of 45 SET Monoblocks now) -- Still own 2 Pair.I can't remember whether the resistor was on the input or not for sure. Ron Welborne gave me the suggestion (Which was about 10 years ago)...
Edit: -- I just opened up one of my Amplifiers and inspected the Resistor Mod. It was a resistor that was placed in series between the Ground on PS Regulator Board and the Star Ground on the Chassis.
Edits: 04/20/21 04/20/21 04/20/21
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