Do you have a wire tying the arm ground to the ground on your phono preamp?
VPI JMW grounding issue
Not sure where to post this, so I'll try here. my VPI JMW Memorial tonearm has developed a noticeable hum. The hum increases when I touch any part of the tonearm, so I'm assuming it's a grounding issue. I've swapped cables, (except the leads from the cartridge), phono preamps, and cartridges, with no improvement. Is there an easy fix that I need to know about? Is there a service that will rewire/upgrade the internal wiring? TIA for any assistance.