You’ve gotten some excellent suggestions. I owned a Van Alstine T8 and enjoyed it.
A couple more: Dehavilland Ultraverve- impedance matching may be an issue but the cathode follower design helps. I used it within Bryston, Van Alstine, Akitika and pass amp camp diy monos
For solid state a used Bryston BP 20/25/26-tranparent and built like tanks
Out of the box but if you’re handy Akitika PR 102- I built one and the sound is really good. You can also purchase assembled. The flexibility and control are bonuses to the sound.