Noticed that my SDS is producing a hum when the needle is in the groove, but only when running the SDS at 45 rpm. If I lift the needle up, the hum stops. If I leave the SDS at 33rpm and change the belt to the 45rpm position, I can play LPs without a hum.
I just switched from a Dynavector 20SL to a Dynavector XV-1s today. My SDS is adjacent to my turntable. If the proximity were to be responsible, wouldn't I hear it all the time - not just when the needle comes in contact with the LP?
I assume you've already tried the TT without the SDS connected and the hum went away, if that is the case see if relocating the SDS helps, if not email VPI.
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