SUGGEST A TUBE AMP?

To add to Rrog's excellent post, the Quicksilver 8417 amps can be easily converted to use 6550/KT-88/El-34 tubes.

I second the Quicksilvers, I own a pair of the Mini-Mites which are great amps.

Yah, you can convert the old 8417 but then you totally change the character and in my opinion, not for the better. Too bad cuz the 5 tube version was a sweet amp. Actually they were mono's.

And yes, as others have suggested, the Atma-Sphere S-30 would also be a great choice if mated with the right speaker.