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VPI SDS producing hum at 45rpm

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?

Thanks in advance for any advice.
madfloyd
stanwal's avatar
stanwal
3,147 posts
 
Contact VPI, they are very helpful.
madfloyd OP
411 posts
 
I've never had any luck getting ahold of them, actually. Their phone system doesn't allow for messages and they've never picked up the times I've tried.

This morning I'm noticing the hum at 33 rpm too. I wonder if the exposed design of the XV-1s is more susceptible to interference from the VPS. I can't easily move my VPS so I'd like to get a good feeling that that is the problem before I go through the hassle.
mjglo
127 posts
 
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.

Mike
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