Anyone familiar with 6C33C-B Power Tubes?

Antique Sound Labs uses them in their Ki22Fox integrated and KMP60Fox monoblocks. Check out tubestore.com for some info on buying them. The 6C33 is part of a family of high-transconductance tubes that are tough to design with but can deliver very good rewards if done right. That is about all I know about them. Arthur

Tenor Audio also uses these tubes. They are relatively inexpensive ($18-$25), but I haven't discovered any other manufacturing sources.
Jeff