Thanks for clarifying the isolation block theory. I'll give it a try, if all else fails.
Further troubleshooting : I tried examining the wires sticking out of the cartridge and everything seemed fine. Haven't found a way to open the table itself, beyond lifting the platter, not sure I'd feel confident enough to try.
But I did play around a bit and made the following obversations.
I get the intermittent hum with the turntable turned off (plug pulled). Could the hum be a product of faulty isolation if no sound is playing ?
I tried removing the ground wire from the Rega. The high-pitched hum seems, perhaps, slightly less frequent (I might be imagining things), but I get a lot of buzz that I did not have before.
Is there anything else I can try ? Both the Rega and the Pro-ject table are still under warranty, if it comes to that.
Edited by Mrtn77 - 9/27/13 at 3:38am