Usually an otl amp with 10 x 6as7 can have 4 removed and in their place have an opt installed to give far better hi fi performance more po and use far less power from mains and run cooler.
Otl amp vinyl.
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My amp shown above 10 watts channel by berning no longer in production alas is single ended and in actual use is like an otl type amp the best of both worlds.
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Runs relatively cool generating only about 275 watts of heat compared with the 1 200 watts to 1 800 watts produced by other otl amps.
This may explain why his relatively small company new york audio laboratories can build an amplifier like the futterman otl 1.
He calls it zotl to differentiate it from otl but the result is the same.
The attractions are obvious less cost less weight shipping costs too and the avoidance of distortions from transformer sounds obvious.
Otl asylum otl output transformerless amplifier user group.
Or a stand alone otl pre amp.
Harvey s audio equipment always strives towards the glorious folly of providing the most romantic sound possible with modern technology.
Single ended tropde class a all tube drive output transformer coupled again many of you will repeat the same advice go listen and see what you like better.
The damping factor of the einstein the silver bullet otl amplifier is at a minimum a factor 5 or higher compared to a conventional tube amplifier or even in other otl realized concepts.
Bruce rozenblit designer of the transcendent sound otl amplifier has solved all of these problems and has built an otl amp that.
The otl 3 s were most recently running a pair of 1959 klipsch khorns 16ohm they are a fantastic match when corresponding with ted hammond he said that they were near perfect impedance for the otl 3 stating that the amplifier was designed to have full output into a 25 ohm load.
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The only real disadvantage of an otl amplifier lies in its incredibly complex circuit which results in very expensive manufacturing techniques.
This is the best sounding tube amp i ve heard.
Which brings us to output transformerless otl amps a valve amp design that has been floating around for many years and as its name implies does without those big output transformers.