FOH, Fuzzy, All-- Just read that RVG article. Fascinating! It's always more complicated than we think! Sorry if so much of what I posted earlier was redundant; I didn't read the Blue Note article first, or I might have curtailed some of my already-covered commentary.
BTW, if anyone is (even more) interested in recording tech from that era, I could hook you up with a link to my interview with Bob Olhsson (Motown mastering and mix engineer, and all-around audio technology historian)...
GJ