I really like the TTVJ portable Millett hybrid, and have turned down more than a couple of offers to buy mine. Skylab ranked it in 7th place in April, mostly due to the tube ring of bumped. But, it only rings when flicked fairly strongly, an edge is lifted and dropped, or you plug something into it.
There were only about 360 tubes available for it, so they were limited to 200 amps, to keep spares for the future, although they theoretically should last the life of the amp. This summer only 38 of them remained to be sold, and I know one guy who bought two of those, so he'd have a spare just in case.
It's good for classical, jazz, new age, electronica, rock, acoustic, etc. But, it is not the best choice for highly sensitive IEM, due to the tube rush ("swirly noise") and high gain. Klipsch Image X10 actually did pretty well from it, but not recommended for SE530, TF10Pro, Westone 3, etc...