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Re: Joule...

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Rich, interesting perspective, yes a transformer is a transformer but a Output transformer is something else, the ZH-270 has lots and lots of transformers, that is for sure but none being an output transformer or anything resembling one, the word OTL mean "output" transformer less, not completely absolutely transformer less everywhere (CATLE) :) An impedance converter is not a output transformer, it's a converter, it is not possible to do what the impedance converter does with any ouput transformer, therefore it cannot be a output transformer and if it cannot be a output transformer, then it's output transformer less.

What people think in the trade as a OTL, is limited to what they know and was the only way to do OTL's for 50 years, this is a new way, a different way, unprecedented reliability, efficient, cool running, light weight, long tube life, compact and most importantly, proper speaker impedance matching, all with the performance and spec's of what people think of as a conventional OTL.

I see Rushton has posted the Thread at audiogon, here is the direct link to Dave comments below.

As for the tube-> converter->speaker description, again it's much more complicated than that, if we are simply talking audio frequency, as you are, the converter is not in the signal path and therefore not an issue, so it should be like this.

(250KH)
Converter
|
Tube->speaker


Allan
David Berning Co.





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