I have a VPI Scoutmaster with the same cartridge, same problem. The only fix I could find was using a PS Audio GCPH phono preamp. Completely eliminated the hum. Switching power cords, cables, grounds, using RFI/EMF shielding did next to nothing to help. I tried several other similarly balanced phono preamps by Sonic Frontiers, BAT and ARC; none fixed the hum. Horray for the little preamp that could: PS Audio GCPH.