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.
Best amp for natural timbre of unamplified acoustic instruments & vocals w/ Revel F32?
Because these are ceramic and titanium they can sound hard, thin and sterile. But they need solid state probably because they are inefficient and for bass control. I like tubes but what are your experiences?