Try moving the unit away from your preamp and keep it far from your interconnects, especially the connection from the turntable to the phono preamp stage.
VPI Synchronous Motor Hum problem
I have the above (newer model) and it hum's when I switch it to 45 RPM. It is fine at 33 1/3. What could be the problem?? The unit sits on top of my wood equipment cabinet. In the cabinet and right under the motor drive is my pre-amp. The T/T is off to the side of the cabinet a few feet away. Help!