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RE: Potsie

Posted by Lew (A) on November 24, 2024 at 20:45:28

In Reply to: RE: Potsie posted by Palustris on November 24, 2024 at 12:41:15:

There are really only two different types of OTL amplifiers, the Futterman type, formerly produced by companies such as Futterman, NYAL, Prodigy, Counterpoint, KSS, and Sans Pareil (I think that's a model name, not a company name), and going back in time, Luxman. All of those are basically Futterman amplifiers with some modifications to his original patent. Then there are OTL amplifiers that use a circlotron output stage, and to my knowledge, there is only Atma-sphere in that category. The Futterman circuit places capacitors in series with the output, in order to keep DC out of the speakers. The circlotron output stage places PS capacitors in parallel with the audio output. I've owned 2-3 different Futterman amplifiers and for the past 30 or so years I have been using Atma-sphere amps to drive ESLs. There is another company out of N or S Carolina that made OTLs; they were a major player, but my mind has gone blank on the name. I think those were circlotron types also. Then also BAT makes or made circlotron amplifiers but with a transformer coupled output.

Edits: 11/24/24

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