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Re: Joule...

24.215.97.68

Hi Rich, how's it going :) I see there is a still this confusion on what the ZH-270 is, may I recommend that we have a look at the Charles Hansen's technical review.

http://www.davidberning.com/hansen_on_zh270.htm

this pretty well tells the story, this amp in every respect performs as an OTL and better in the respect of speaker impedance matching, the technology that allows this to happen is very, very complicated indeed and transcends normal audio circuitry and therefore it's stereotyping, this is where I think the confusion comes from, this amp is trying to be "labeled" into a simple category.

I have seen well respected manufactures call this amp a digital amp, a hybrid amp with a solid state output, then to a aircore transformer coupled amp.
What it is, is something that is very hard to understand in normal audio terms and is nowhere close to any of the above.

I may also add that the term Zero Hysteresis may be a confusing terminology, as it misleads one into thinking that it's a transformer, people are under the impression that Dave has invented some miraculous transformer.

If you read Hansen, and understand it, you'll see that the reason for the comparison to Audio transformers is that the amp is doing what Audio transformers do, without a audio transformer, so the relationship is for comparison only.

The RF Impedance matching device is not a transformer but a complete circuitry that employs several transformers, of non of which are Output transformers or any of which are in the audio signal path.

Charles Hansen is a Modern Transfer technology engineer, and he even calls the ZH-270 Complex.

It's all confusing I know, but because this technology is misunderstood or hard to understand, it's misleading not to call it an OTL and it's also wrong just to call it an OTL, it's best to say, I dunno what it is, you figure it out :)

P.S One Stereophile reviewer called it, Output transformer less Amp ( but not OTL )

Allan
Berning Co.



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