If you unplug your preamp from the amp, do you still have the hiss? Does the hiss change in volume when you adjust the volume of the preamp?
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That makes little sense to me.
If the his varies with the volume control, it comes from the preamp or the source.
If the hiss comes from the preamp or source, it should disappear when the preamp is unplugged from the amp. Are you sure it is completely disconnected from the system and that there are shorting plugs in amp's inputs?
The fact that you isolated your amp from the rest of the system would narrow it down to a couple of possible explanations that I would check first.
1. The noise is typical of the unit (ask Bryston)
2. Try an AC line conditioner. (garbage in - garbage out)
3. If not 1 or 2, I would be asking someone smarter than myself.
Kr4 that is exactly what I thought. I was expecting that once I disconected the preamp, the hiss would go away since it increased when I turnded the volume up. I have a Audio Matrix power conditioner coming on Friday so maybe this will help. I am also having a dedicated line put in soon as well. I will contact Bryston about it as well.
I listend again last night and the hiss can be heard about one foot away but not more than that. The volume increase is minimal when the volume is increased on the preamp. My guess is it coming from the amp. I will put on the power conditioner and see if that helps. Thanks for the information and help.