I have run the Harbeth C7ES3 and SHL5+ on tune amplifiers in my med-large room. I tend to like the higher powered KT120 amps and used the Rogue Audio Cronus Magnum II and then the Rogue Audio Stereo 100.
The sound in all cases was sublime. Rogue tube amps sound much better than many people give them credit for. Power, punchy bass, ultra refined, transparent and a humongous sound stage.