@johns21 I am running a tube pre, and currently a tube stereo amp.
The other HT channels I am using are on Class-D.
I am seriously thinking of going Class-D on the main L/R pair.
I am sure there are arguments both ways, but a tube pre and A/B or Class-D between them and the speakers are not a bad way to go.
Probably better is HT is used for the majority of the time. Otherwise those tubes get used up on HT where one is not listening as intently.
But horses for courses, as they say.