What is the quietest preamp you've used?


Can you also please tell me whether you were using balanced or se ins/outs? Thanks.
matti
Nagra PL-L. Easily the quietest and most transparent. Ayre K-1x was also quiet (but a bit drier than the tubed Nagra)
Krell KCT but qualified as "dead quiet" in combination with a 400cx amp connected via CAST.
Since were talking ONLY about noise and not any other factor, I would guess either Krell or Boulder. Interesting to see all the answers.