Harbeths and Tube Amps

I have C7s and know they require a good amount of current. As someone who's been a tube amp owner for 20 yrs, I'd like something that will properly get hold of and drive Harbeths. Anyone have suggestions that they use or have had experience with? My Air Tight 300B (at 10wts) seemed to 'give up the ghost' with the C7s. By the way, my room is small, 11 x 13.5 x 8, so I don't need crushing volume, just good control and drive. I've bought a Plinius SA50III which actually sounds superb, surprisingly enough to me but maybe I just haven't checked out good S/S amps in too long a time. I think I just miss the 'cache' of tubes and trannies.