I've had quite a few tube amps SET, Push/Pull pentode, ultra-linear and triode.
And with all of them the better I made them sound with mods, the closer to the better high bias Class-A/B solid state amps they got.
The only tube that was up there with them was OTL tube amps, but they have problems for me with the type of speaker they are happy driving. And I can't live with that type of speaker.
Cheers George