When were the best tube amps made?

Modern state-of-the-art tube amps continue to evolve and push the envelope ever farther, so the best tube amps ever made are likely on a test bench right now.  The Convergent Audio Technology Statement Extreme comes to mind.   

@knotscott  No argument with CAT!!

There are other aspects to this question. IMHO value must certainly enter the equation. All amplifiers are compromises on some dimension. Either with respect to size, weight, convenience, aesthetic considerations, system synergy.

Nowadays there are many very fine builders who have studied the history of this field and are now seeking out the best components they can find.

Synergy with the desired speakers is also important. In my system, with my 94dB efficient speakers, 1.5 watt amplifiers sound superb.

Guess my short answer is the best amplifiers are being made now.

After Audio Note kondo' s Ongaku.

NYC at Julius Futterman’s West Side apartment. His hand-made OTL tube amps remain unequaled today! Starting in the late 50’s with the H1 and H2 triode OTL’s , then in 1964 with the H3 Harvard Music HB5 pentode OTL stereo chassis and finally the H3aa mono 6LF6 OTL’s in 1975. The H3 was the only one to get a mainstream audio mag review by High Fidelity in 1964. In 1976/77 The Audio Critic reviewed the H3aa mono’s and was quite impressed! Julius died in August 1981. Soon afterwards I bought my first pair of H3aa’s (#111A,111B) from a Boston dealer (Q Audio). I used them with the Quad 57’s.