Hi my turntable is picking up high frequency interference.
The setup is a Pro-Ject RPM5 connected via a Clearaudio phono stage to a Quad 99/909 combo. When I disconnect the turntable from the phono amp the signal vanishes. Trying different RCA cables between the deck and the phono stage, alter the pitch of the interference, but none of them cure the problem. Connecting an earthing lead makes no difference.
As the system is close to my AV equipment and wi-fi, I sequentially unplugged each component to see if this was the problem, but again no joy.
I'm at a loss, any ideas?