Every studio was different back then... most studios built their own consoles until around the beginning of the 70's when "console manufacturers" started to spring up... Neve, API, Sphere, Helios, APSI, Angus, and a whole host of other regional desk manufacturers began to appear.
Most of the tape machines being used were made by Studer, Ampex, or 3M... most studios didn't really use much EQ though I believe Pultec [Pulse Technologies] started in the late 60's... most mic pre's were of the "cassette" variety that went into custom built consoles... and as the 70's began "solid state" technology started to arrive... making things like mass manufacturered consoles [like Neve, API, etc.] possible to produce on a scale that made console manufacture possible.
Microphones were mainly Neumann's and AKG's... but they had nothing to do with the modern dribble those company's currently spew. Back then they were hand crafted instruments that would cost hundreds of dollars [remember, you could buy a brand new Camaro in 1968 for like $2,000-... so "hundreds of dollars" for a mic was a HUGE investment].
Reverbs were either acoustic chambers or EMT "plate reverbs" [again, both were pretty expensive investments].
A lot of old radio and broadcast equipment was repurposed for recording... as were "disk cutting" equipment... like the Fairchild limiter, RCA limiters [which were mainly used for broadcast], Federal, Gates, yada, yada, yada
This is, needless to say, an exceptionally abridged version of what was going on back then but I reckon it might be a start for you to do some further research.
Best of luck with all you do.
Peace.
