Is the Bellari new? Maybe there is a problem with it-try exchanging it. But first try grounding the TT or phono stage. Also, place the Bellari as far away as possible from the amp. Good luck.
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Can you hook up the transformer to the amp without the actual turntable hooked to the transformer and eliminate the hum? If this is true then the issue is in the connection from the TT to the transformer. Is there a ground wire attached in addition to the RCA cables? This sounds like a possible grounding issue if it is not the transformer itself.