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In Reply to: RE: Odd hum issue - suggestions ?? posted by rogerh113 on May 30, 2017 at 16:28:22
The neutral to ground lug on the chassis was also enamelled, so cleaned that off. No improvement in the hum. I then ran a jumper wire between the the neutral bus of a large capacitor pair directly to the ground lug - hum gone.
I am thinking that with an enamelled coated chassis like this the conductivity is pretty bad. With the neutral to ground connection on the back of the chassis, and the ground lug at the front of the chassis, there is just not a good electrical connection. I'm going to get a ring terminal and wire, and run the neutral to ground lead directly to the ground lug. Right now it runs from the middle of the chassis to the back, and instead this will run from the middle of the chassis directly to ground. Hopefully that will put paid to the problem
regards - Roger
I'm glad you fixed it but what is a "neutral to ground lug"?
The neutral wire (white wire) connects to one end of the primary of the power transformer and does not connect to earth ground (the green wire) or anything else within the chassis.
Do you mean you ran a wire between "signal ground" and "chassis ground"?
The schematic show such a wire to already exist.
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"Still Working the Problem"
"The neutral to ground lug on the chassis was also enamelled, so cleaned that off. No improvement in the hum. I then ran a jumper wire between the the neutral bus of a large capacitor pair directly to the ground lug - hum gone."
I strongly suggest that you use a multimeter or other tester (or call an electrician) to be sure the Neutral and Ground wire at your AC outlet are correctly wired.
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