Check to make sure that all interconnects are plugged in all of the way. Also, check the cartridge leads.
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The early VPI speed controllers were not well shielded and commonly would cause hum if placed too close to phono preamps or the table itself. The SDS is OK. If you have a speed controller that is a pre-SDS VPI product, try to move it far away from the table and, importantly, far away from the phono preamp. Good Luck.
I moved the liner conditioner(speed controller)away from the other components and that eliminated the hum. I did check the connections before I did this and could not move the cables very easily so moving the speed controller seemed the simplest solution. Thanks to all for sharing you wisdom. Don't know what I would do without this site. Len