You are wasting your time, a quality sand amp will never compete with a quality tube amp. Period. Unless you like your coffee w/o sugar, your fries w/o salt, your popcorn w/o butter, etc... No body to sand amps, I've owned all the best. Rowland, Krell, Levinson, Goldmund, Threshold, Pass, Accuphase, et al. If you put gun to my head, and absolutely FORCE me to use sand amp, I would go with Goldmund. Only sand amp I ever hear w/treble that can match tubes. But still lacks body and air in the midband.
CAT, Jadis, Joule-Electra, Atma-Sphere, VTL, Wolcott. These are real amps. YMMV...