Someone on antiqueradios.com found this amplifier design from 1956. I've seen some modern designs where people are doing fancy things with the amplifier power supply, but look at what Mr. Crofford did back in 1956 (starting on page 24):
https://www.americanradiohistory.com/Archive-Audio/50s/Audio-1956-May.pdf
https://www.americanradiohistory.com/Archive-Audio/50s/Audio-1956-May.pdf
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