You sometimes incounter a problem using tube pre and and a SS power amp. Some (alot) of SS power amps have a low input impedence that is difficult for a tube pre to drive. If you have a ss amp with a 100K or 150K input impedance, no prob. On the other hand--most ss pre-amps can easly drive a tube power amp. Personally, I like tubes all around or a hybrd pre. It is really not fair to make general statements anyway and you should listed to each piece and decide----but the input/output impedance is very commonly overlooked and makes a big difference in matching of equipment.
Anyone else evolve beyond tubes?
Over many years of owning both solid state and tube amps/pre-amps, my most recent high end system makes me question the need for tubes at all, except at the source! My Mcintosh C46 pre and MC501's driven by an MF A5 CD player into Dyn" C4's with MIT Magnum cabling produces music of great beauty and dynamic swing. I even demo'd some of the newer tube gear available for comparison...not even close. I think modern, well designed solid state gear is superior overall...at least with a tube output stage in your source!