My old high-end Amplifier died and I just replaced it with a cheap one. When I set it up, I now have a bad Hum from the turntable that I didn't have with my old amp. Both my old and new amp have no phono section so I am using a Pro-Ject phono preamp, going to the CD or DVD (tried both) RCA input of the amp. I grounded the turntable to the amp chassis and the preamp chassis and neither affected the hum. The CD mode works fine and sounds good - no hum there.\n\nMy question is, could the new cheap Amp be the cause of this, or is it a new ground loop problem or something else?