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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: 11/24/24Follow Ups:
That's the name of the other company that produced OTL amplifiers with circlotron output stages, I think. They are out of business, so far as I know, but the amplifiers are still in use.
Hi Shovel,The Mark Levinson comment was not from the AudioXpress article and project.It is somewhere in my stack of stuff. I'm glad you explained the transformer issue.In the article were mentioned 2 different transformers and where you could buy them.I'll dig it out tonight with some more info...-Mark
If so, you might try switching to "Classic", as indicated by the red arrow in the first picture above. With that view, it makes it much easier to see that you're responding to Lew's reply, and not to mine, as shown in the second picture (below). I nearly didn't see this, so the Classic view might save you some grief in the future if you're wondering why a person isn't responding to you.
Hi Shovel, after I read your note I put the transformer implemented passive preamp back in my bedroom set up.Electroprint was the name of the transformer co. Jack Eliano was the head and article writer.I have not found the article yet but I do have it.There were 2 transformers recommended.There was a nickel core and a more expensive silver core.I opted for nickel. There were plenty of specs in the article.I will find it...-.Mark
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