Systemdek IIX TT low frequency hum

Hi Jbaussie,
Sounds like an earthing problem with your deck/tonearm - it's 20 years since I had a systemdek & don't know the earthing arrangemnet with your model.

Try taping a thin gauge piece of insulated wire from the base of your tone arm to the earthing post on your amp/phono stage.
If this cures the problem, scrape some paint from the underside of the tonearm base & solder the wire to it - wind it around your tone arm signal cables & solder a lug/spade to the amp end & connect.
Rgds Si

My money says Simon is right. You can just crimp an alligator clip to the wire and clip it to the tonearm base under your tt, it might do the trick also.