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In Reply to: RE: Distortion and Audibility...replay. posted by morricab on June 20, 2008 at 01:49:25
"There is definitely some feedback in the amp but perhaps it is only local feedback."
That's a given. Without local feedback (AKA emitter/source/cathode degeneration a la Boyk and Sussman), the circuit gain cannot be controlled accurately because it will be strongly dependent on device parameters. Emitter/source/cathode followers all have 100% local feedback, and just about every BJT power amp uses an emitter follower output stage.
If there is some manufacturer claiming no local feedback in their designs, they are probably stretching the truth at best. Charles insists on not calling local feedback "feedback", but instead calls it "degeneration". People familiar with that concept understand what he's saying, so it's not misleading in that case.
Follow Ups:
I was not referring to degeneration but I know what you mean. I am thinking that perhaps there is a loop wrapped around either the output stage or perhaps the input and driver stages but not from input to output. I know that Simaudio was touting that they didn't use any negative feedback in the output stage. DarTZeel uses only smaller loops as well.
Obviously, every SET amp that has a cathode follower as a driver stage is using degenerative feedback in that stage at the very least.
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