OTL Asylum

OTL, Output Transformerless Amplifier User Group.

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RE: FWIW

Posted by Ralph on December 20, 2010 at 08:24:33:
There have been plenty of Futterman-style OTLs in the last 30 years. One of the best was the Prodigy, made in Texas. They went under in the early 1990s. We did get to compare the amplifiers at that time, and also last year when one came through the shop to be refurbished.

We've also done comparisons with the Sans Pariel and Triumphe (Fourier Components), the latter being a 6AS7-based version of the Futterman circuit. These comparisons were done in the late 1990s when the company was still around or just barely had gone out of business.

So the issue of newer parts, while important, may well be moot, if any of these amplifiers are considered valid Futterman candidates.