Japanese tube amps. Wavac, Air Tight, Audio Tekne, Komuro etc.

I owned an Air Tight ATM-2, which was used to drive Harbeth SHL5+ speakers. It was the best tube amp I've ever owned; the sound and build quality are exceptional. 

I'd love to pick another ATM-2 up someday, but you rarely see good quality units on the used market. 

@inna 

I found four systems, including my own, that have Air Tight paired with Harbeth. It's everything you'd expect from a good tube setup. 

Here's my system: https://www.audiogon.com/systems/6378