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Old 17th Oct 2019, 10:10 pm   #48
MotorBikeLes
Octode
 
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 1,504
Default Re: Cretinous idea - The combined volume pot and mains SW.

I vividly remember those slowly receding spots in the middle. I stayed with an aunt back in 1953, and she had a TV; I saw the "interlude potter" a few times on that TV..
later(1964/5) I played with my first old TV (which I did get to work briefly), and read about angled guns and ion trap magnets. Adjusted them on sight for optimum picture.
later, I read about aluminised tubes, guns now in line again, and no bother with ion burn.
However, I have seen (and caused at least once) a burned out central spot on a colour TV tube when the scanning stopped, but the beam did not (coils unplugged?).
Les.
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