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I have a modified VPI HW19 turntable with two arms. The first is in the normal spot on the right and it is quiet. The second arm is mounted in the left rear corner of the table – within 2 inches of the motor. I’m getting a hum only when the motor is running. If I remove the arm from the table, the hum is dependent upon how close the arm is to the motor. At about 9 inches away from the motor the hum is gone. No combination of grounding connections has any impact on this hum.

Are there any recommendations to eliminate this hum? They will be most appreciated.