J.A. Cook Jr., Transistor Limiter Amplifier Circuit, patent filed Oct 1962

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modman
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Full Patent Text in PDF:
US3223936.pdf
(679.2 KiB) Downloaded 130 times

US3223936 Transistor limiter amplifier.jpg
The source for this information is here. I did not discover this, but trying to create some sub text...

The patent being applied for on 23rd of October 1962, and published on the 14th of December 1965, make it a very likely source for the EHX Big Muff circuit:
big-muff-pi-schematic.jpg
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