Figured I'd pass along this awesome shot of Motown's first mastering setup that was posted on the GS mastering forum by former Motown cutting engineer Bob Olhsson
his reply to my question as to what was what:
Best regards,It's an AM-131 fixed pitch with a Neumann ES59 mono head. The signal processing is an Orthophon high frequency limiter, a pair of our own 7 band graphic equalizers with half-speed capability and some filters that could also be set for half speed cutting. The amplifier in the picture is a Mac 200 and of course that's a Studer C-37 tape machine.
Steve Berson