Behind the scenes UK experimental colour transmission 1957

[old_tv_nut]

Originally Posted by tubesrule

It's nearly impossible to run the frame rate of the television at a different frequency from the AC power. (at least for crt based sets) This is why all 50Hz power countries use a 50Hz field rate, and 60Hz countries use 60Hz.

Well, it was nearly impossible to do at a reasonable price with tubes at the time. Obviously eventually doable at reasonable cost with more sophisticated solid state power supplies, as demonstrated by millions of computer monitors.