Re: Nostalgia of old tv sets
Many live TV shows had to rebuild their sets when HDTV arrived because of this. However, it has nothing to do with watching old signals on a new TV.
We may be thinking of two different things with the term "live TV". In the 1950s, several television series were broadcast live (I'm old enough to have watched them). These days, it seems live TV is mostly limited to news broadcasts on the national and local levels. I know some local stations had to upgrade their news sets for high definition.
Curly: Moe, Larry, the cheese! Moe, Larry, the cheese! (Horses Collars, 1935)