Gibson EB-3 technical reference information

Gibson EB3 circuit schematics series 1 (1961-1971)
Gibson EB3 circuit schematics series 2 (1971-1979)
EB3 controls (1978) - What the varitone and four pots actually do
EB3 parts list (1965, 1971, 1977, 1981) - All the components listed with part numbers