The Revels are not that bad, I heard these F32 with a Pass integrated and the sound was not thin, hard, or sterile. I also have experience with your preamp, and here in my room, IT was the culprit for this type of overly analytical, hard, glaring sound. I tried the finest vintage tubes and expensive cabling, no luck. Finally moved to a Joule Electra preamp and enjoyed it much more.