I have been running a C220 preamp with a SS power amp for about 8 years, and I am very happy with this combo. I just don't have the patience or heat tolerance for a tube power amp and all the maintenance they usually require.
I replaced stock tubes with current reproduction Mullard 12AX7, and the C220 got quieter, smoother, and the soundstage expanded. Very affordable tubes even if you buy tested, matched quads. They are not too warm, IME, but just right.