ETI 470 + ETI471 Schematic

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This amp design is crying out for some decent compensation design.

Problem was, ~40 years ago there was no LTSpice or any other readily available simulators. I think compensation design in those days was for all but a few very knowledgeable practitioners, a black art. You certainly would not comp an amp like that today. Some of the old JLH and Elektor designs also look decidedly pedestrian by todays standards in this regard.
 
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