A class D amp with a tube pre-amp.
That's what I use! I have a Kern IP-777 pre feeding an SWR Amplite power amp. It's the head that relegated all my other amps into paperweights. Talk about tonal nirvana! I have not gassed for anything else amp-wise in years.
...oh wait. ....uh.
I mean... You know, you probably won't like that setup anyway. it's uh,... Well, you know. Big heavy tube power amps are really the way to go 'cause of... uh...
...stuff.
Oh my. Look at the time. Gotta run.