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Originally Posted by ppppenguin
Japan has both 50Hz and 60Hz power which must have made things a bit interesting for their TV service.
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Interesting Jeff. I didn't know Japan still used mixed frequencies. Perhaps after the war everything was converted to 60Hz?
The US had a mixture of 25, 50 and 60Hz power but had mostly settled on 60Hz by the time of commercial electronic television. You can still find 50Hz based US clocks from the 20's and 30's.
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Originally Posted by old_tv_nut
Well, it was nearly impossible to do at a reasonable price with tubes at the time. Obviously eventually doable at reasonable cost with more sophisticated solid state power supplies, as demonstrated by millions of computer monitors.
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Hi old_tv_nut. This is what I was referring to but you did a better job elaborating. It was certainly doable with the power supplies of the time, but not practical or cost effective. Solid state based crt monitors did eliminate the ripple effect from the power supply, but you still had to deal with stray magnetic fields that could distort and ripple the image.
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Originally Posted by NewVista
Using systems with 25fps is unenlightened (based on 1920's 24fps film). It should not have been television spec by the 1950's.
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This isn't quite the same comparison. 24fps film would look horrible and flicker badly if projected at 24fps. They realized this very early on and use a 2X or 3X shutter in the projector which fools the viewer into seeing 48fps or 72fps thus eliminating the flicker. Of course the content is still at 24fps so motion won't be as smooth giving it that "film" look.