Ultralinear vs. Triode vs. SET

Ooops, was rushing at the end of my post. Last paragraph, delete "mated" after SET.

Very simply: a pentode based amplifier will be more versatile with speakers. A SET is very finicky and will like some speakers and music more than others. Despite the poor measured performance of the SET, it somehow manages to sound more realistic and more believable than any other amplifier type ... provided it is matched with the right speakers and the right type of music.

Thanks for all the great replies so far. A couple of additional questions:
1. Would a single ended pentode amp typically have the same sonic benefits as a SET amp?
2. Would a push pull amp with no negative feedback potentially have similar sonics to a SET amp?

HI All,
For me, the prime drawbacks of SET amp is their low power and restricted frequency response/dynamics. I won't argue against their mid range. It's great.

My problem is I have never heard a high efficiency speaker that I would die for. Yet, these are the only speaker types that a set amp can drive. This plus they basically sound like active tone controls.

No thank you.

Sparky

Maybe take a listen to a tube amp where the tubes are direct heated. I think Coincident makes one like this. More of a SET sound with frequency extension.

Happy Listening.