My wife and I saw the musical "Memphis" last night. It is set in the mid-1950s and it has several scenes in a TV studio, using a pair of (I think) RCA TK-10 cameras. Live images from the cameras were displayed on a huge screen above the stage.
The displayed image was black and white, but I wonder if the cameras had modern guts inside. The little viewing screens for the camera operators appeared to show
colors . . . .
Fun to watch, anyhow.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html