My first TV was an old dual standard (VHF 405 line / UHF 625 line) black and white set that used to belong to my parents before they bought a massive Decca colour set (think it was a 21" screen). It was the kind of set which had folding doors to close when you weren't watching it.

Anyway, those old dual standard TVs involved a lot of switching of circuits and hence a lot of contacts involved. With age problems arose, and being all valve they occurred as the set warmed up. I got fed up with having to switch the set on about 5 - 10 minutes before I wanted to watch a programme.

It was replaced with a colour TV, which like yours had a headphone socket (mono only) which I did use. Happy days.