I have VPI table. I used to have the hum then i disconnected the ground and use a regular transparent cable to pre-phono. No more hum.
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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.
Did you disconnect the ground wire that's built into the VPI interconnect cable, the ground wire that goes from the turntables ground terminal to the phono preamp ground terminal? Or did you disconnect the ground wire that comes from the underside of the tone arm to the ground terminal, the one that was pre installed on the turntable?
You need to establish a ground from the TT to the preamp! That is where the cables are grounded to from the TT in the first place. Try connecting a lead from the TT ground to the preamp chassis. If it has a screw somewhere on the chassis un screw it enough to connect the lead from the TT ground terminal. Forget about the Belarri ground. It may lessen it but the ground is indirect. I have a similar problem whenever I add a separate phono stage into my mix. Connecting the phono ground to the aux. phono preamp's ground only partially removes the prob. but connecting the the pramp ground or chassis does the trick. Also, try using a cheater plug on each AC cord, one at a time, after you do the ground wire if it still doesn't go away.
Hum prblems can be very frustrating, and there are no hard and fast rules because everything depends upon everything else, from the components in your system to the wiring in your house. That being said, you should try connecting the ground wire from the tonearm to the PREAMP, instead of the phono section. This will usually lead to a much quieter background. The phono section will be grounded to the preamp through the line level interconnects.