I know of a few audiophiles who do / have done this. The argument that is put forward for combining tube (for the mids and upper frequencies) and solid state amps (for the bass frequencies) in a bi-amp arrangement is that the tube amp yields a nice, sweet treble, while the solid state amp provides tight, dynamic, well-controlled bass.
Personally, I didn't care much for the tube/solid state combo in the systems I have heard. The tube amp and the solid state will usually have quite different sonic signatures, and on high-resolution speakers the differences are quite detectable. I think one gets better results by using a tube preamp and solid state power amp.
Personally, I didn't care much for the tube/solid state combo in the systems I have heard. The tube amp and the solid state will usually have quite different sonic signatures, and on high-resolution speakers the differences are quite detectable. I think one gets better results by using a tube preamp and solid state power amp.