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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: RE: DIY options posted by rogerh113 on August 8, 2019 at 11:24:59:
not sure there was ever a final schematic.
Its on page 3.
The Circlotron OTL has a history too. Although we were the first successful company selling one, a Circlotron OTL was patented around 1955. It integrated the driver tubes into the Circlotron which IMO was tricky to set up.
Historically the Futterman sort of dead-ended with Julias. There were other amps based on the circuit- NYAL, Fourier and (to a lessor extent) Counterpoint, to name a few which really cemented the idea in audiophile's minds that 'if its an OTL, its going to blow up'. Futterman didn't help that much- according to Harry Pearson of The Absolute Sound, Julias showed up at his house with a pair of monoblocks, one of which promptly failed, taking a loudspeaker with it. After his death, the only serious evolution of the Futterman idea was Transcendent Audio; the latter seem to hold together rather well.
Atma-Sphere is the oldest OTL company in the world (43 years we've been around much longer than Futterman was) and the simple reason that is so is because we were the first to figure out how to make OTLs reliable. That's important, especially if a vintage and possibly rare loudspeaker driver is involved- our amps aren't known for eating speakers (if they were, we'd have been gone long ago).
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Follow Ups
- RE: DIY options - Ralph 12:37:01 08/08/19 (2)
- RE: DIY options - Lew 08:14:43 08/14/19 (0)
- RE: DIY options - rogerh113 13:35:40 08/08/19 (0)
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