Ground loop hum

Congratulations! Glad to hear you found it. 

This is one of the great reasons to post your system under virtual systems. I bet this would have been recommended very quickly if someone had seen photos of your system. Words unfortunately only identify the things you focus on... while a photo will show things you may not have thought of. 

I guess I should post it. Soon I will. It all fits in a front hall closet with records, except the speakers

Another victory for Audiophiles!

Check your cartridge/headshell leads

Thank you all. This vm problem is resolved no need for further responses.