I presently use the ss H-Cat with Exemplar 2A3 parafeed tube amps. This is the best sound I have ever had. I have often used ss preamps with tube amps, because I have never heard a ss amp I could listen to for very long, this includes Levinsons, Krells, BELs, Classes, Mirror Images, Brystons, and Parasounds.
Using ss amps with tube preamps is troublesome because of the high output impedance of tube preamps and the low input impedance of the ss amps.