Tube Audio Design makes a ss amp (Hibachi) for those who like the TAD sound but don't want to deal with the perceived hassles (hot surfaces, maintenance, reliabiluty, etc) of tubes. The Hibachis also offer more output. The company claims that their ss designs sound similar to their tube units with modest feedback applied. IMHO, the Hibachis indeed sound more "tubelike" than many tube amps I've heard.
Marty
Marty