Pivetta, I used the alligator clip clipped on the ground portion of the RCA jack. It was cumbersome and would work its way loose. But it did identify the problem. However if you have disconnected ed the Rt. Channel and the hum is there, this not the solution.
Hard to say at this point, have you double checked the cart leads or tried another cartridge? There used to be an issue with Grado carts producing a hum as the tonearm approached the spindle. I remember reading that there were "Mu metal" shields to place around the motor, but really don't recall much beyond that.
Hard to say at this point, have you double checked the cart leads or tried another cartridge? There used to be an issue with Grado carts producing a hum as the tonearm approached the spindle. I remember reading that there were "Mu metal" shields to place around the motor, but really don't recall much beyond that.