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OTL, Output Transformerless Amplifier User Group.

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

"Are NOT a transformer in the sense of having primary and secondary windings. So this is not the same as an output transformer like regular tube amps have. The output signal comes off the same winding wire as the input signal goes into, so no degrading of original signal like a transformer with primary and secondary windings do. So it's like comparing Apples and Oranges."

OK, so let's take a conventional SET amplifier and replace the usual output transformer by an autotransformer. They probably don't make these as standard items (!), but we could easily engineer one by connecting the secondary (speaker) winding of a conventional output transformer in series with the primary, with the appropriate phase sense. We would then connect the "far" end of the speaker winding to B+, and the other end of the original primary winding to the anode of the output tube. The speaker would be connected, as before, across the original secondary. (The fact the speaker winding itself would now be at B+ voltage is a potential inconvenience, but the discussion here is about a point of principle.)

You would not, I think, claim that the amplifier has now become an OTL amplifier, just by virtue of the simple act of replacing the impedance-matching dual-winding output transformer by an impedance-matching autotransformer?

So why would one make the claim that a formerly-OTL amplifier is still operating as an OTL amplifier if the output is now being run through an impedance-matching autotransformer to the speaker?


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