For tube amplification, Rogue Audio has several options that should drive Harbeths very nicely.
I would personally also look at SS amps to drive Harbeths. My immediate options would be McIntosh, Bryston, McCormack, Plinius, and Rowland among a few others. My suspicion is I might not need to look beyond the Bryston B100SST which would provide a very simple system with analog/computer sources.
If you like the SA50, I'd try to track down one of it's larger siblings for an audition
My 2 cents, YMMV.
I would personally also look at SS amps to drive Harbeths. My immediate options would be McIntosh, Bryston, McCormack, Plinius, and Rowland among a few others. My suspicion is I might not need to look beyond the Bryston B100SST which would provide a very simple system with analog/computer sources.
If you like the SA50, I'd try to track down one of it's larger siblings for an audition
My 2 cents, YMMV.