Tube Audio Design makes a tube amp close to your price point that doesn't require a linestage/pre. It's very versatile in tube compliment. You can use EL34 to 6L6(KT66) tubes. I've been told it will handle the KT88/6550 but my friends seem to like 6L6. I liked the 6CA7's(EL 34's) the best. It is only 60 watts in ultra linear, 30 watts in triode. It's all point to point construction.
I have HT separate from my hifi and would not consider class D or T amps. I think they are the future but in infancy. Solid state was that till the MOSFET, JFET, Bipolar and NPN class A such as the Sugden now it some ways I prefer them to tube.
Try Audiogon and check what is available. May find a Jadis Orchestra used close to what you want to spend. I doubt it though, you will find the TAD-60 and posts on it.
Also Mapleshade has rebuilt Scott receivers, they use EL84 which are only 22 watts. They may have some other brand that run on 6550's for more power.
These are not big, but bigger than the class T amps. I heard a class T amp from Parts express, I hear the potential but not the fidelity.