Hi fdegrove
Thanks
I have wired a ground to the preamp
when the catridge wasn't put on the record, there was no hum.
But when the cartridge was put on the record, the hum came.
need advise.
Many thanks
Chris
Double check your cartridge wire connection. Make sure they are tight and in correct oriantation(match the color of the wire with cartridge). Also check to make sure the wires are not broken off.