Its a bit later, but maybe people where still using CT-100's in 1968-69 (moved to the kids room by then). Music Scene was shot at ABC on Philips cameras and looks really good, I have 2 episodes form 69 with bonus material on LaserDisc. It is available on Amazon but is a tad pricey. PM Me if you are interested in an episode.
http://www.amazon.com/Music-Scene-Th.../dp/0788602136
And speaking of the 60's How about Laugh In?
And for 50's there is a copy of Jerry lewis in The jazz Singer, which was shot at NBC Brooklyn in 1959 I believe.
http://www.dvdtalk.com/reviews/54293...e-jazz-singer/