Hum...ZYX with Tom Evans Groove Need suggestions

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?

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.

Thanks for all the input guys...haven't had a chance to try your suggestions due to my busy schedule.

Connorjr33, was it your amp or preamp power supply that was causing the hum?

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.
Thanks all!