I just checked and mine is a model 17-T-200, and it also has two RCA jacks on the back.
My set has been low on my restoration list, but now that I know that it has a video input I'm rethinking my prioritys. I don't have the schematic (if your sam's covers my model you could make me very happy by sending a copy to me) so I don't know if one could connect a DVD player, VCR, etc. to it directly, but even if will not work directly I bet a OP amp circuit could be built and installed under chassis to make it work (I sort of hope for the latter as I'd like to try my hand at creating said OP amp circuit).
Good luck on your restoraton.
Tom C.
PS: I think you have got a cooler cabinet on your set, but I'm still glad to have the table model due to my space limitations.