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OTL, Output Transformerless Amplifier User Group.

RE: From what I understand the Zero's...

I agree that there are differences as between dual-winding transformers and autotransformers, but I think it is an overstatement to say "so no degrading of the original signal like a transformer with primary and secondary windings."

The functioning of the autotransformer still depends upon the audio signal inducing magnetisations of the iron core, and upon the way in which that magnetisation then induces emfs in the part of the winding that connects to the speaker. (The autotransformer would become almost completely non-functional if the iron core were removed.)

I think with the autotransformer, the amplifier setup cannot properly be called output-transformerless. It has become an amplifier that depends crucially upon magnetic induction in an iron core in order to function.


Edits: 05/06/17

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