Alec Watson from Technology Connections did an entire series on this subject:

(How Analog Color TV Works: The Beginnings) https://www.youtube.com/watch?v=dX649lnKAU0

Then the playlist on TV stuff: https://www.youtube.com/watch?v=l4UgZBs7ZGo&list=PLv0jwu7G_D...

Don't blame me for the rabbit hole :P