True balanced will help fight RFI and noise in general, and is a great idea, but really should be necessary to rid your system of a ground loop.
I suggest you read the archives on ground loops, both here and at audioasylum. Then I'd try borrowing other gear(e.g. cheap reciever) and trying to see if you can eliminate to isolate which component is causing the trouble. If you can narrow it down to your pre, call the manuf for suggestions. One obvious one is wires touching each other. Make sure your cables cross at right angles when possilbe and that no power cables touch each other or any interconnects.
Turntables are notorious for loop issues, so first try just CD, resolve the digital/amp/pre then add analog back and see if you still have no hum. Good luck,
Spencer
I suggest you read the archives on ground loops, both here and at audioasylum. Then I'd try borrowing other gear(e.g. cheap reciever) and trying to see if you can eliminate to isolate which component is causing the trouble. If you can narrow it down to your pre, call the manuf for suggestions. One obvious one is wires touching each other. Make sure your cables cross at right angles when possilbe and that no power cables touch each other or any interconnects.
Turntables are notorious for loop issues, so first try just CD, resolve the digital/amp/pre then add analog back and see if you still have no hum. Good luck,
Spencer