So interesting thing about that.
Really old TV shows have the potential to look amazing because they were shot on film that’s as high quality as movies today. Film is roughly equal to 6–8k resolution.
But sometimes around the 70s-80s (I think, I don’t remember the exact dates) a lot of TV shows started shooting on video tape. Not sure if you are old enough to remember VHS tapes but they were basically shooting on those (but a bit higher quality) but those look like crap but it was both a lot cheaper and a lot easier to edit.
It wasn’t until early 2010s where shows largely transitioned *back* to not looking like shit.
In addition to the other answers, I’d like to add that colour bleeding was probably a huge factor in these shows looking better on old TVs compared to new one. It’s the same reason why a lot of retro games look bad now, because the way they were designed was for monitors where one pixel would bleed into another, instead of showing as a crisp square.
[Here’s an example of such sprites where modern monitors just don’t do them justice.](https://i.stack.imgur.com/JmOsq.png)
You didn’t notice it was so bad originally because the analogue TV standard was designed to be viewed at 7 screen heights. Full HD (2K) is designed to be viewed at 3 screen heights. These days a 40″ screen is smallish but, in the days of CRT sets, that was ludicrously large and almost never seen. Most cinema projectors are still only 2K.
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