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RE: Distortion and Audibility...replay.

"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.

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