After a very drunken purchase I’ve now got an old Audio Note M7 preamp.
It’s the Audio Note ‘sound of the music’ M7 Tube ‘silver sound’ with phono stage one.
Problem is that with nothing playing there is a very noticeable noise, I’ve never heard one of these make any noise or hum when idle.
It sounds like a hum with a rushing noise in the background, the hum is constant but the rushing noise increases with volume. I’ve tried earthing/grounding the amp back to the DAC and phono stage but neither makes any difference.