Russel you might need to experiment with different grounding scheme's to find the preferred approach for your particular situation. Typically all grounds from the turntable should connect to the ground screw on the phono stage, ie: connect separate, equal length leads from tonearm ground & turntable ground to phono stage. Another ground from phono stage to preamp may or may not be desirable. Could also try running both the ground leads to the preamp ground screw instead vs. the phono stage ground screw; while that is not typically done it might be the better approach. If you can't work out the hum in that way then maybe experiment with your interconnect cables. Also try connecting phono stage to the preamp but leave off the turntable interconnects to see what happens / find the source of that hum via process of elimination..
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