Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Re: Harmonic Multiplication in Linear Devices

Posted by john curl on May 9, 2003 at 15:57:17:
I'm glad to note that we are discussing something useful to audio designers. In reality, we usually still have to use both local and loop feedback, but it is not as easy to decide which or how much, as some would think. ;-) For example, if you take mosfets, jfets and perhaps tubes, and then make a differential pair from them, you completely change the distortion. It goes from 2'nd with a little 3'rd (probably expansive) to almost pure compressive 3'rd. Is this good? Is this bad? Are the advantages of direct coupling, total distortion reduction, bias stability, etc, etc worth the change in the harmonic series? This is what real analog designers wrestle with every day, and why many tube designs stay single ended at the input stage.
WW is tough to get, but contact me first, if you need something. I might be able to help. The very BEST AES bargain is the CD rom collection of almost everything for about $400. I have it and love it, especially the stuff published 20 years ago and more.