Hiss noise from my SFL2 preamp


I have had a hiss level from my Sonic Frontiers SFL2 for a bit. It is constant, loud enough to hear across the room and does not change in volume with the volume pot. It goes away if I mute the preamp. I have all new tubes, changed them around and no help. Balanced or single ended mode both. The phase switch when engaged is much noisier and more grunge sounding. Any ideas?
jothompson

Showing 1 response by beavis

I have no experience with SFL2. Does it have tubes? How long has it been since you have changed?