Adding Composite Video Input to my RCA CTC21 Chassis

[loud41]

I just got a 1967 RCA HH-860F aircraft carrier console! Only problem is that the automatic tuners on the CTC21AC chassis are on the fritz. They constantly cycle the channels. I don't think the set has ever been serviced as all the original tubes are still in place, including the crt. Very clean inside apart from dust. Came from a non smoking home too! I'd like to just ditch the tuning circuits and pipe in a composite video signal as I'd just like to use the set as a "monitor" for my old gaming consoles. I want to keep everything in place so it's all reversible.

I restore antique radios as a hobby, but this is my first vintage TV. I figured it would be similar to adding an aux input to a radio chassis, but after looking at the Sams schematic for the CTC21, boy my head hurts lol.

I see the video output tube, but it looks like it wants a strange input voltage signal. The 2nd video amplifier seems to want a more standard 2v signal, but the 1st video amplifier wants 3v? Should I utilize those two amplifier circuits? Either way I'm going to need to boost the signal from the gaming consoles as they output 0.7v peak to peak.

Or should I just deal with the tuner circuits and get them working? Pretty sure the UHF and VHF motor gears are stripped as it just positively wails whenever it activates, and the UHF tuning knob is frozen in place. The VHF tuner cycled a few times, but now that wails as well without spinning the dial. The motors constantly are cycling, picture signal or not. It's very annoying lol. I don't want that automatic feature anyway as I'll only be using either channel 3 or 4 if I end up using my VCR as a modulator.

Lastly, save the lectures on high voltage. I have great respect for these devices already. I'm an idiot, yes, but not completely stupid. I take great pride in my work and am always very safe with everything I do. If there's something that needs to be discharged (like the crt tube for example) or whatever, let me know. Just save the diatribes on how these devices kill everyone that touches them except the cable guy.