[balabaster]

Back then, a lot of the TVs had frequency and vertical and horizontal hold dials. There was a fair amount of leeway in tuning the device to display the picture consistently.

I would assume nothing needed to be exact because you could fine tune on the fly. I remember when you tuned our 3 TV stations in the UK by dialing the frequency dial to the correct radio frequency. It's been a long time that I don't recall the radio frequencies by perhaps I recall ITV being 68 MHz(?)

[benj111]

"perhaps I recall ITV being 68 MHz" that would vary from transmitter to transmitter, or else they would clash.

[balabaster]

Maybe, but our TV's had analogue frequency dials instead of buttons, so we had to tune them manually.