Preamp hissing detectable at low volume?


I enjoy listening to chamber or choral music at low volume. I can detect the hissing coming from speakers. Is this a tube problem? I have brand new Sashas and brand new monoblocks. I am running a Sonic Frontiers Line 3 Preamp (Balanced).
vishla
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Great! Thanks Viridian. I'll give Jim a call on Monday. I appreciate everyone who took the time to help point me in the right direction on my tubular journey. Best wishes.
11-05-11: Vishla
Thank you all so much for your responses! This rushing sound is audible from my listening position during idle, and it is evident to me during quiet passages. And thanks for your thoughtful instructions Viridian. I am a little nervous about messing with the tubes in my discontinued SFL3, Special Edition. Can anyone suggest a good outfit for replacement tubes and/or upgrade of other elements within the piece?
Vishla (Threads | Answers | This Thread)

I had a SF Line 3SE+. Contact Chris Johnson @ http://www.partsconnexion.com/. He was the designer and founder of SF and should be able to help.

PCX is also a good source for tubes. I probably bought 100+ tubes from Chris over the years and they are all excellent. I think PCX sale is still active so good time to stock up.

From my experience, my favorite Line3SE+ tubes are Amperex/Philip Holland 6922 PQ/SQ and replacing the 6U8A's with Ediswan CV5065's.

Good Luck!