If your TV wasn't quite adjusted properly you could see the data scan lines at the top of the screen as flickering white dots and lines which was fun.
There was a stock fault on BRC 1400 series valve TVs where a resistor in the brightness network would drift high in value and cause uncontrollable bright flyback lines in the upper half of the screen, and you could see those wriggly dotty crawlies ;-) I can't remember the component number - I think I last replaced one when I was 15 or 16, they were the teenage bedroom hand-me-down set of choice in the 80s, absolutely scads of them about in all sizes - but I can still picture in my mind's eye exactly where on the board it is, 220kΩ, red red yellow.
All long gone now, I expect.
If you find one do not re-cap it - the capacitors will be fine. They always are, there aren't any tantalums in it. Instead pay attention to everything above about 200kΩ and find out which ones are now closer to 1 meg!
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There was a stock fault on BRC 1400 series valve TVs where a resistor in the brightness network would drift high in value and cause uncontrollable bright flyback lines in the upper half of the screen, and you could see those wriggly dotty crawlies ;-) I can't remember the component number - I think I last replaced one when I was 15 or 16, they were the teenage bedroom hand-me-down set of choice in the 80s, absolutely scads of them about in all sizes - but I can still picture in my mind's eye exactly where on the board it is, 220kΩ, red red yellow.
All long gone now, I expect.
If you find one do not re-cap it - the capacitors will be fine. They always are, there aren't any tantalums in it. Instead pay attention to everything above about 200kΩ and find out which ones are now closer to 1 meg!