I have found an answer: API console apparently.
https://www.gearslutz.com/board/so-m...72-1976-a.html
Or UA mic pres at the beginning according to Johnny Sandlin in this Tape Op article:
And Capricorn Sound?
In the beginning we had a console built out of Universal Audio mic pres and line amps. Jim Hawkins put all of that together and built the patch bay. It was big and had the big rotary knobs, but it sure did sound good. We had very limited outboard with maybe four compressors — just a little EQ, with bass and treble controls on the mic input. The monitors were [Altec] 604Es. Those speakers really worked. You wouldn't think so because they were limited, especially in the bottom end, but if you got things right on them it would translate to any kind of system. I think we used the same speakers later when we had the MCI 16-track machine and MCI JH-416 console. I cut Gregg's Laid Back and The Allman's Eat a Peach on that. Eventually that was all upgraded to 24-track. The final incarnation of the studio had an API console and Studer machines and they all worked. We had a big space for the players and a great piano that had come out of Carnegie Hall.
https://tapeop.com/interviews/82/johnny-sandlin/