It could be DC on the potentiometer. If you're using a phono pre-amp (or your turntable has one built-in) it could be outputting some dc voltage which can make the pot sound dirty when it is moving. You may need some fresh caps in the phono pre. I suppose it is also possible that there is a voltage differential between the chassis of your turntable and your integrated that is putting some dc in the circuitry.
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