Studio 50 used to be called Playhouse 3. It was a radio studio that could seat an audience. I remember a show called "Major Bowes amateur hour" which was broadcast from there. Frank Sinatra got his start from that show.
The control rooms were split with video and production on one side and audio on the other. Later, they modified it and put the control room in back of the studio. The audience was fascinated with the camera movements, and production felt it was a distraction, so they put walls around all the cameras with a hole in front so the lens could stick out. Still later they built a runway from the control room to the stage to accomodate a Houston dolly.
The video racks were downstairs and the remote controls were at the main control room so one videoman stayed downstairs (me) and Paul Lannini did the actual video upstairs.
It was my job to color match all the studio monitors as best as I could. They all hung from the ceiling so I had to climb a ladder for each one. the floor sloped toward the stage so I fell a few times.
Charlie Grenier was our TD and he was some piece of work. He would come out to the runway during set up and I could imagine him thinking "Who is the weak link and how can I get rid of him"
I hope my rambling has enlightened you a bit. All the old guys know all about what I have said and could probably correct me on a few things.
Playhouse 3- studio 50 - the Ed Sullivan theatre - was opened in the early 30`s.