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In Reply to: RE: Beveridge? posted by Lew on February 19, 2016 at 10:10:33
I have not looked at this schematic in a long time. I am by no means an expert.
It is part of the motional feedback system Beveridge used by injecting Rf and feeding back net diaphragm displacement rf signal to crowbar or limit excursion on the line source.
He was a pretty amazing engineer. Both he and Peter Walker could put a lot of the modern types to shame I would think!
Follow Ups:
Although I responded to your PM slightly differently, on second thought, the function you are describing may be happening within the input and driver stages of the direct-drive amplifier proper, after the high pass filter, in other words. There's a 7.5M resistor that feeds back from the output stage to the driver stage, with ~1600V on one end and barely 3V on the end that is attached near the driver section. Lots of filtering going on in the input section as well. I don't pretend to understand it, but I have been able to work on it a bit only because of the tutelage of another EE Bev owner I encountered on TubeDIY. Like me, you can get the original Bev amp schematic from RM.
I quite agree, HB was at the very least a major innovator in the history of audio, if not a genius, and he gets very little credit for it, mostly because his company was so short-lived and the products are rarities. I do also think RM had a lot to do with the original dd amplifier. Every single aspect of the Model 2 or 2SW system is novel, yet the system as a whole is a smashing success. HB is easily up there with Peter Walker in my book.
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