Hi Lenny & Welcher
Yes a good valve preamplifier matched with a excellent solid state power amplifier is a very nice blend of both amplifier designs, excellent sonic results can be achieved this way.
Welcher, the Wilson Watt puppy 7 will run with SET amplifiers of higher out put like 845, 211, 833A etc fine.
Usually it is easier and more affordable to use a more powerful Push Pull valve amplifier to get excellent results with the Wison speakers, and as a general statement more dynamic results.
If cost is no object then there is always exceptions of course, like the Lamm ML3, WAVAC HE 833A etc.