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Old 15th January 2002, 02:15 AM   #11
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Join Date: Sep 2001
Location: Fairbanks, Alaska
Default Whooo done whaat

There are many designs that are based on many other earlier designs, and also many different names for the same basic designs. This is what is called progress. There are actually only a number of ways that parts can be wired together to make a working circuit of a specific design. So it is not unusual for things that act alike to look alike.

Now who gets credit for what? The original designer behind a circuit concept may hardly be known, while others who borrow the concept or parts thereof and make it popularized may become a household name. Thus to make something popular is the key to success.

I can honestly say that all the circuits I have ever designed are based the work done by other individuals in the world of electronics and electronics engineering. And I hope that everyone is able to give credit were credit is due.

Food for thought, nothing else.

John Fassotte
Alaskan Audio
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Old 15th January 2002, 02:29 AM   #12
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Join Date: Oct 2001
Location: Queensland, Australia
Originally posted by promitheus
sounds alot like the new XA amp from passlabs.
The Pass XA amps use SS which is a form of non-destructive feedback ... on the other hand, these amps appear to be completely free of global feedback.......

I take it that the Ayre amp has a balanced output also....
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Old 15th January 2002, 04:51 AM   #13
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Join Date: Mar 2001
Location: USA
AudioFreak, the Ayre's output is balanced, and like some of the Pass X models, it will accept either a balanced or unbalanced input signal.

As for who did what, it wasn't my intention to make this an issue. I see all these designs as variations on a theme, a dialogue of sorts that may well have begun with some obscure microchip designer a decade or more ago. (I would certainly credit the inventor of the balanced folded cascode if I knew who it was!) There have been some brilliant insights along the way -- and certainly Nelson's qualifies -- which is part of what makes it so interesting to follow.
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Old 15th January 2002, 05:56 PM   #14
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Having been through the schematic of the Ayre,
kindly provided by Charles Hansen, it is a very fine
product, however, it bears no relation to the
SuperSymmetric design. SS does not depend much
on implementation details such as types and polarity
of devices or topologies of front ends, cascoding,
Class of operation, or output stage type. It does
require a differential input driving balanced symmetric
circuits, but uses the feedback scheme symmetrically
to only make the errors of both sides identical and
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