As I have the Supratek Cabernet pre, could I ask you a question?
Have you had any problems with hum ?
I ask because I have been marred with hum problems using the Cabernet, it was sent back to Mick, but having gotten it back and it working fine, I moved the system from the living room to a dedicated music room, plugged everything in again and the hum came back, it’s such a shame because when this pre works it sounds wonderful.