Ultralinear vs. Triode vs. SET


I currently have a Rogue Cronus that I have been quite satisfied with, but I am intrigued with the possibility of a SET amplifier. From both a technical and sonic perspective, what are the differences between a tube amp with switchable ultralinear and triode mode vs. a true SET amplifier?
droz
Atmasphere, thank you very much for that clear and informative synopsis. Great stuff.
Some really excellent posts above!

I'd be interested in further comments that anyone might have on how much of the 45/2A3/300B "magic" tends to be sacrificed in well executed designs that use higher powered transmitting triodes, such as the 211 and 845. For push-pull as well as SET configurations, if possible.

Regards,
-- Al
Al:

In well executed designs, I think the SET "magic" is there for the high powered SET's as well. My favorite high powered SET tube is the GM70. I like my GM70 amp just as much as my 45,2A3 and 300B amps. In fact, If I could have only one SET amp I would probably take the GM70 due to its amazing presence and versatility over multiple music genres.
Sparky,
I agree, the SET experience most certainly is`nt HiFi it`s music presented naturally.
" is`nt HiFi it`s music presented naturally."

LOL - Oh no! You're not really going to bring that one back, are you Charles?