If this hum comes from the turntable, you have to replace the mains transformer, in my case the hum was caused by strain magnetic field of the mains trasformer picked by the cartridge and was strongest at the rest position. I replaced the transformer with a toroidal one, and moved it from the left front corner to the left back corner. This completely eliminated the hum and vibrations. It's also good to make some other modifications to the power supply wich grately improve the performance.
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