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RE: Classic Mac Sound

Posted by seas on February 20, 2017 at 06:52:01:
The McIntosh circuit topology was not Ultra-linear. They had a patent on so-called "unity coupled" amplifier circuitry, which was the basis for all their tube designs from the MC 30 on. They made use of a special transformer winding technique along with a cathode winding to provide large amounts of local feedback around the output stage.