A used Spectron Musician mark any. The pre I am still amazed by is the 300 buck used the AE-3 from Cary but under their own label. Upscale has some of the less expensive models new for about $700 or 800.
The Spectron isn't cheap but the only other big power amps (small in size) that came to mind were the Bel Canto 1000 Monoblocks, which retail for $ 4 to $5 K. I know the Spectron Mark III is now in th $6k range brand new. If you can find the earlier marks they should run about $2000 they are very good sounding amps for ICE power. If totally out of budget remember, a lot of cheap watts, sounds just like that, a lot of cheap watts.
The preamp however is a world beater and cheap! It is a tube pre, but no phono. It uses a modest compliment of just 2 tubes or 3 if the rectifier tube is present.
They are 6SN7s which even are still around as NOS. Further you can find and more than just decent tubes. Granted they will cost as little as $40/pair, but I would throw in the money for very good tubes around $100/pr or so will get you great sound. Very, very good example sof the Sylvania CHS JAN 6SN7 WGTs from the 50s will run about that. No they are not the top dog but like I said better than you might expect.
If you want another high powered amp consider the older Aragons like the 8008 I. I had the Palladium 1 ks for a while and they have the power but the best sound IMHO. If you can get a Coda or the like you could take a shot but you chance burning them up. The hafler? beats me. Might as well consider Carver in that catagory.
To bad you don't have the speakers for the tube amps I use now. They really are totally under-rated by most. The Opera Consonance 800 monoblocks, the reviewers like them -they won a Brutus Award, but I don't hear of many being in circulation. These amps are simply great period.
