Have you tried using a cheater plug or grounding system to center screw on AC outlet? Grounding problems are notoriously quirky and extensive trial and error is often required.
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Thanks for your responses.
Stanwal, yes I have tried cheater plugs. Can you explain more on grounding system to center screw on AC outlet.
I have connect the tonearm ground wire to different places in my system with no improvement.
G_m_c, I have moved the Groove around different locations on my rack and away from the Michell's power supply which did lessen the hum. But it's still louder than what I had with other phonos. It appeared the Groove easily picked up noises from power supplies.
Any other ideas I should try?
have you troubleshot the rest of your system? swap interconnects to see if the left side still has more hum. the ground from your tonearm should ground to the ground lug on the back of the groove. doublecheck all connections, from the catridge on up the chain.. etc. the cartridge/phono pre combo you have are top notch. there is an issue elsewhere, or you have a defective component.
Yes, I have tried different interconnects with different geometries, the slight hum remains. A fellow on a different forum recommended that I open up and add another ground to the Groove which I have done but it didn't improve. I will probably be moving the Groove out and away from my audio rack all together, I currently have the power supply of my mono blocks and preamp in close proximity. I have heard others with hum issues with the Groove, wonder if they ever got it figured out.
I did get the hum resolved today!!!
Moved the amps away from the Groove, the hum remained. So I moved the preamp further away from the Groove by switching places with the CD player on the rack. The system is much quieter now...the Groove is not the most quiet of phono's I've had but it does sound fantastic.
The hum was from the preamp power supply being too close.