Rega Planar 3

Well, just picked up a Rega Planar 3 last week at my local shop. Really started to like it with the stock cartridge until I noticed a hum that got louder as I move the tonearm closer to the spindle.
Dropped it off at the shop, they agreed their is a hum. They changed the cartridge, same hum. They are contacting Rega Monday to figure it out.
Hope this tt wasn't a mistake.Anyone else hear of this?
Have a Rega RP3 and have the same problem. I have just learned to live with it. I have a Rega Exact cartridge. Not long ago there was a post on this problem and as far as I know was never resolved. My hum is not loud and I really don't notice it unless I move the tonearm to the center and turn the volume up. I don't notice it when playing a record but still I know it must be there. My solution saving for a  JA Michell TecnoDec hoping I can use the RB 303 tonearm. If you find out what's causing this please post i would love to know what Rega says. 
Will do. Oddly enough they have a P6 set up and a P1 that we turned on and moved the tonearm around and no hum so that's kind of bewildering. I will post when I find out.
So it's interesting to work backward on this.

Grounding wire issue? If so, then the hum should be there no matter where on the disc the tonearm is.

The grooves towards the spindle tend to be less bass-heavy and more out of alignment then the two null points before them (that's why, for example, Peter Gabriel's "In Your Eyes" was placed at the start of the B side of the LP; because of its heavy bass line), so is your cartridge picking up noise? But...

The hum's there no matter the cartridge, so it sounds almost like an internal issue - the tonearm wires; the AC motor.

Let us know what Rega says.

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The hum is caused by the motor, and I ignore it because it's loudest beyond the grooves where it doesn't matter. I don't hear it on playback after recording.
My REGA P3/24 is always dead quiet regardless of what cartridge I mount on it. One of the best sounding entry level tables I have owned. Dynavector 10X5 is a incredible synergistic match on the RB300 series tone arms.

Matt M
It may a combination of the Motor RFI/EMI and a tonearm grounding issue

Try testing for continuity across the ground wire and the tonearm - if that is OK then your cartridge is sensitive to noise from the motor. Grado carts used to be very sensitive to noise from the Rega motor.

I have not had an issues since I had the tonearm wires replaced with a Cardas one piece loom.

I now have an Audiomods arm with a one piece loom - it is now very quiet.

Regards - Steve