Pehare, I had the same exact issue with a Magnum and headphones. Sweet amp though.
Rogue Audio Cronus Question
I'm just getting used to a new(used) Rogue Cronus (not the Magnum) - and I noticed that if I leave the tuner on (Aux 1) while listening to the turntable (Phono), some faint music from the tuner comes out of ONE of the speakers. It's in phono mode, and obviously I can get rid of the sound by simply turning off the tuner, but why would that happen, and how can I correct? Thanks.