Brightener circuit done.
https://i.imgur.com/IHTbXYq.jpg
source is a 12 volt 3 amp DC PWS, set to 7.2 ( aprox ) have a hefty 8.5 ZD clamp on the output to protect from overload, and 100mf filtercaps, I don't foresee ever going above 8v with this, and if I do I will just replace the ZD.
https://i.imgur.com/39W7mv1.jpg
I will most likely will try going with a tuner, the input to the video output is 1.5 or so, and composite is 1.1 or so, so the contrast is a WEE bit low for direct video input, but not very much, abut there is also no agc, so the best way would be to try a tuner, i guess.