Well, amp #8 arrived the other day (yes, psychiatric intervention sorely overdue). I have one amp F.S. here (Kinki Studio Vision THR-1), but this gently used Icon Audio HP8 MKII deal came up and could not be ignored. These don't come up F.S. very often (pictures below...excuse the pigsty desktop).
And now I see why they don't come up F.S. very often. Even with stock power tubes and a decent but not outstanding input tube, this amp sounds amazing. It has easily the best bass I've ever heard from a tube amp. It goes lower, hits harder, and conveys tonal nuances in the bass far better than any other tube amp I've heard. I haven't lived with any of the big transformer-couple amps many here have, but I've heard a number of them at shows. This bass is crazy good. The rest of the frequencies are quite good, as well; plus the usual 3D note thing and extra space in the soundstage that tube amps do.
With aid from
@geoffalter11, who also owns one of these, tube rolling will soon commence, and I suspect everything I like about this amp will get even better. We've had fun PM'ing about this remarkable little amp. It certainly doesn't hurt that it's such a handsome design.