Do you own one that humms? If not why would you expect that it humms?
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I used to manufacture power conditioners with isolation transformers- Silver Circle Audio. TCHAIK 6. It had a 70 pound toroidal transformer. Hum - is caused by DC offset in excess of 1 volt. The manufacturer should be able to direct you to a circuit that removes the DC. I used to build them when needed. Hope this helps.