Gregm, with the current business problems facing Tenor, I would stay away from buying new, although there might be some deals on the used market. Atma-sphere is very familiar with the Tenor circuitry, and will be able to service their amps in the future, should Tenor finally "vaporize".
Atma-sphere products are some of the best value items in the audio business, and certainly far less expensive than the Tenor amps.
The Kharmas are a perfect match for OTL amps! Depending on volume levels, and room dimensions, Henryhk, you might even be able to get by with the Atma-sphere M-60 monoblocks [60 w/p/c].