If you are into DIY, Welborne Labs amps are excellent better than some of the ones mentioned earlier. Bottlehead amps are pretty good.(both 2A3 and 300B amps).
SUN 2A3 single ended triode.....
This unit was highly touted by Sam Tellig in stereophile. I cannot get another review of it anywhere. I am looking for a SET and dont want to spend big $$$$$$ on diminishing returns. Any reviews? Any other SET in the reasonable ($2500 used, $4000 new) range??? thank you