Hi folks,
I tried the GT1000FX(2U)....with my Triaxis as well as with my ADA MP-1 and MP-2 preamps.
The GT1000FX gets as close sound-wise to the sound of a *real* tube amp as possible. It was no big deal and sounded pretty convincing with the ADAs, keeping in mind that they deliver that hot-rodded Marshall flavor.
It sounds ok with the Triaxis as well...as does any other tube poweramp (Engl, Marshall, Carvin, Randall,....)
But personally I´m used to the combination of Triaxis and 2:90 with all its SimulClass magic (in particular; TungSol EL-34B in the Class A and TungSol 6L6CG-STR in the Class AB sockets) and the options of the 3 voicings, and compared to that the GT1000FX stands no chance (imho).
I´ll keep the GT1000FX as a redundacy (it sounds ways better than my old Rocktron Velocity 150....) but my main poweramp for the Triaxis remains the 2:90.