Just got the pro-ject debut carbon.  I have a bad hum.  Its not motor hum, it hums even when the turntable is unplugged.  I have grounded to the amp(Denon AVR-2802).  Have tried plugging amp and table into same outlet.  The only way I can change the amount of hum is if I touch the back side of the cartridge.  That makes it 3 times as loud.  My last turntable didnt do this.  Any advice before I return this unit? 

Thanks for the help!