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Touche', sort of...

After further reading on their website, I did note that at least some of their SE OTLs are considerably more powerful than is typical of the breed. I'd be interested to hear a pair. As to the Class A operating range of a circlotron, I guess it's all about where you can bias the output tubes in terms of current. I use a highly modified Atma amplifier, once marketed as an "MA240". It used six 6C33Cs per monoblock. You can bias those at 300mA per tube, all day long, so, more Class A power than you calculate I think. I am now using four 7241s per monoblock for about the same current. But the larger Atma-sphere amplifiers, like MA2 and MA3, can handle more bias current for more Class A operation.

My real point was that I object to their exaggerated put down of conventional OTLs. Parenthetically, because this is a subjective opinion, the Futterman amplifiers, even though they do use copious amounts of NFB as compared to a typical transformer-coupled tube amplifier, still manage to sound wonderful, better than one would expect given that fact.

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