I have owned a large number of tube amps over the years. The list includes a pair of McIntosh MC60, a pair of Paoli 60M which were enhanced Dynaco MK3, Hadley 601, Conrad Johnson MV50, and Dyna 70. I've always preferred tubes.
My current amp tops them all. It is a model 66-100 from Elliott Studio Arts in Seattle.
Each unit is custom-made by hand.
The transformers are made in the USA and they are huge.
The circuit is wired point-to-point. The mechanical construction is aircraft quality. The heavy gauge metal chassis is machined to tight tolerances. It uses quality fasteners and sports high-quality paint and plate finishes. But it's not just beautiful, it is quality throughout.
The best part is the sound. My unit uses four KT-120 tubes that provide plenty of power for my power-hungry vintage JBL L-250ti speakers. (Lower power tubes can be used as well with slight mod by Kevin Elliott.) Tube bias is easily adjustable with controls on the top and a built-in meter.
The amp comes with a 5-year warranty plus complimentary minor upgrades if circuit improvements become available. Kevin is easy to talk to, builds a great product, and stands squarely behind it. And the price is much lower than many of the other quality amps of the day. I highly recommend it.