As a rule, the station keeps the owner's manual on their equipment in their library. Obviously, your station didn't. I have a RCA 76B2 console that I bought years ago, and very fortunately, a Xerox copy of the book was with the board when I bought it. The power transformer was cremated, and I was able to find that a DuMont TV power transformer filled the bill exactly.
I have seen brosdcast boards for sale at the Rochester AWA meets, and one was at the Elgin meet in August. I doubt that there ever was any documentation with these units, though. You might try advertising for the specific book you need when you get the equipment. Someone may have it.