There are some good choices and some bad choices, because Sound Labs expect an amplifier with a good power supply design and capable of delivering a consistent number of watts independent of impedance rather than pure wattage ratings. There are more choices in monoblocks, but some stereo tube amps capable of driving them exist. Since I am a dealer for Sound Lab and some brands of tube amplifiers it would be inappropriate for me to self promote, but a few names mentioned by Sound Lab and others, in alphabetical order, are Air Tight, Atma-Sphere, Audio Research (big),
Convergent, Jadis, VTL, Wavac, and Wolcott. Some sound much better than others, and some are much more reliable than others.
Convergent, Jadis, VTL, Wavac, and Wolcott. Some sound much better than others, and some are much more reliable than others.