Do you only experience the hum when the cart. is lowered to the record? And not when the arm is sitting in its rest? If that's the case it sounds like the problem is induced hum (is the motor nearby?) and not a grounding issue.
Low level hum only with lp playback
Basic system:
VPI Prime turntable (cart is a Dynavector 20x2L) with
Purest Audio interconnects ( with integral ground wire connected to phono pre) to
Parasound JC3+ Phono Pre with
Cardas Clear Light Balanced Interconnects and separate ground wire connected to
BAT Preamp
REL R-r328 sub
I use an Eagle PSU with Roadrunner tach for speed control.
So I'm getting a low level hum ONLY when the record is playing. You can hear the hum on the lead in groove - the sound gets louder as the volume goes up even if the music hasn't started. However if the needle is lifted the hum goes away.
I played around with the ground wires locations to no avail.
I've checked the leads to the cart for tightness and to make sure they are connected completely -they are.
I've moved the speed control equipment to make sure they are no interfering.
All my connections are tight.
VPI Prime turntable (cart is a Dynavector 20x2L) with
Purest Audio interconnects ( with integral ground wire connected to phono pre) to
Parasound JC3+ Phono Pre with
Cardas Clear Light Balanced Interconnects and separate ground wire connected to
BAT Preamp
REL R-r328 sub
I use an Eagle PSU with Roadrunner tach for speed control.
So I'm getting a low level hum ONLY when the record is playing. You can hear the hum on the lead in groove - the sound gets louder as the volume goes up even if the music hasn't started. However if the needle is lifted the hum goes away.
I played around with the ground wires locations to no avail.
I've checked the leads to the cart for tightness and to make sure they are connected completely -they are.
I've moved the speed control equipment to make sure they are no interfering.
All my connections are tight.