Rega Planar 3 hum resolve.

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The Grado hum is easily corrected by grounding the motor to the tonearm.

What cartridge is the OP using? If it's a Grado- well, that's a problem with Rega tables

Bought one last week and was excited. I could hear a faint hum immediately but thought it was a fan in my hallway. Three songs later it was obvious and getting worse. After poking at things, found that it was indeed worse the closer the cartridge was to the spindle. Tried everything I could electrically to fix it to no avail. I even bought a $200 phono amp. Ridiculous to have such a problem. Returned it and ordered a Pro-Ject X2. My AT LP 60 sounded better than the P3. No way I was going to start monkeying around trying to jury rig an internal ground or add shielding to a new $1K component.

monko, In this case, the OP had a problem well known to owners of the lower end of Rega turntables; hum that got worse as the cartridge approached the motor.  Ralph offered the standard correct solution.  No hi-fi rack and no amount of separation between TT and amplifier will fix that particular Rega-specific issue.

I know this is well past the date the question was posed, but the simplest method is to buy a hi fi rack that separates your turntable for your amplifier. Worked just fine for me when buying  an Apollo Storm.

The best fix is to get a turntable not made by Rega. That will fix your problem.

Rega is stubborn , seldom(never?) change a stand they take .

There is something wrong when a TT  has a cottage industry of after market " upgrades " .

The correct fix is to ground the motor, which is closer to the tone arm when it is nearer the center of the record.

A wire to the case of the motor (and what the heck, the spindle bearing as well) and then to the ground of the arm does the trick.

Dunno why they don't do this themselves! They have to have known about this problem for years now.