+1 on Harbeths with Rogue Audio Cronus Magnum III. I have SHL5+ and love the combination. Alan Shaw is right on at least one point - to get good dynamics out of these they need a decent amount of power. Thus, the Rogue, with 100 W. Of course, you will get sloppy bass and insufficient dynamics if you try to power them with 15W. Don't be fooled by the Rogue's low-ish price. The amps are great. Agree that Rogue tube amps sound much better than many people give them credit for.
Your tube amp related Harbeth experience.
Please share your experience (good or bad), with any model Harbeth when driven with tubes. I have C'7's, and have just moved on from Class A solid state. Again, if you ended up with solid state, your experience still qualifies, as long as your journey had tube amps in the picture. I should mention that while my plan is to go integrated, I would still like to hear any experience with tube amps, even if it was a stand alone tube amp. Please let's not go in the Alan Shaw (HUG) direction here. Anyone involved likely knows the deal there. That's not for this thread. Just personal experience with a dealer, a friends system, buying used, or the like...