When did TVs start to sport A/V jacks...

[Red October]

I am curious. I have, at the moment, no clue if my Colortrack 2000 will ever be fixed. I have a lead on a chassis but it is slow. I just don't have the time to work on it these days. I know that specialized sets made to work with VTRs had the jacks all the way back into the 60s (I have a big B&W Sony set in great shape with a full A/V jack pack, but who watches B&W TV sets these days?), but I'd like to get a nice vintage set with A/V jacks... If this is even possible. Failing that, is it possible to hack A/V jacks into a set, or even to add RGB jacks? My cable box and two of my DVD players have RGB output.