Pullen Mixer Excerpts
From Conductance Design of Active Circuits, by Keats A. Pullen Jr.
Pullen book excerpt
From 73 Magazine (by the staff of 73),
October 1961 article
August 1966 article
Circuit from Electric Radio, March 1993 Issue,
Ray Osterwald's 75A4 1st Mixer - schematic only
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