Ellie - It could be as simple as something called a ground loop. This has to do with the ground having more than 1 path to earth. You might try connecting the ground wire from the turntable to some different components to see if you can eliminate the hum.
Question? Did this just start up with no changes in connections or cables? I tried upgrading to a different cable to my preamp, and the floating ground scheme of the cables caused a hum; the design was not compatible. The cable must have a sheild ground from one end to the other, terminated at both ends; CD players or tuners may not need this. Any New cables? Also, most turntables require a separate ground wire from the turntable chassis to a grounded screw on the receiver or amplifier or preamp. There is usually a ground stud with a thumb nut for this purpose on the turntable chassis. If all these things are in order, the problem could be a broken ground wire or bad connection in the turntable arm or the connections within the turntable base. These are all repairable by a technician; find a good audio repair place and get it fixed.
Ellie - It could be as simple as something called a ground loop. This has to do with the ground having more than 1 path to earth. You might try connecting the ground wire from the turntable to some different components to see if you can eliminate the hum.
I agree with Wong,also,if none of the above works,try disconnecting the ground from the turntable completely.
Question? Did this just start up with no changes in connections or cables?
I tried upgrading to a different cable to my preamp, and the floating ground scheme of the cables caused a hum; the design was not compatible. The cable must have a sheild ground from one end to the other, terminated at both ends; CD players or tuners may not need this. Any New cables?
Also, most turntables require a separate ground wire from the turntable chassis to a grounded screw on the receiver or amplifier or preamp. There is usually a ground stud with a thumb nut for this purpose on the turntable chassis.
If all these things are in order, the problem could be a broken ground wire or bad connection in the turntable arm or the connections within the turntable base.
These are all repairable by a technician; find a good audio repair place and get it fixed.