Knew somebody would spill the beans eventually. I wonder who it could have been. 
Nothing whatsoever to do with bass, to be honest, "proper" or otherwise. Sounding good, though.
Tenson: class T is really just a marketing term, since the amps in question generally use Tripath boards: http://www.tripath.com/ The one I'm going for is the Sonneteer Bronte: http://www.sonneteer.co.uk/ Others are made by Bel Canto, Veritas, LC Audio, Sony, Sharp, etc.
-- Ian