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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: Why aren't OTL tube amps more popular? posted by Ralph on January 4, 2022 at 14:36:10:
The SA-4 was based on a circuit design by Roger Modjeski that was done either right near the end of his time or just after he left Beveridge (HBI). Roger gained a lot of experience from working at HBI, and while many have stated that he designed the Beveridge OTLs/direct drive amps, this was a myth, Roger just tested them as they were built and in operation before he started at Beveridge. Mike Eliot worked with Roger at Beveridge, so that's where the personal connection between the two comes in. When Roger completed the circuit design he was dissatisfied with it and decided to focus on other projects, including building the RAM computer tube tester. Mike Eliot bought the design from Roger and built the SA-4. Not sure how much Mike may have tweaked the design, but Roger always referred to the amp (he serviced a few of them) as a Ferrari. When it ran well it was amazing, but reliability was an issue.
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Follow Ups
- RE: Why aren't OTL tube amps more popular? - clio09 17:08:31 01/27/22 (1)
- RE: Why aren't OTL tube amps more popular? - airheadair 21:38:38 01/27/22 (0)
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