Colour cathode ray television picture tubes

Colour cathode ray television picture tubes

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regenerative circuit[ edit ] armstrong's "feed back" circuit drawing, from radio broadcast vol. no. . armstrong began working on his first major invention while still an undergraduate at columbia. in late , lee de forest had invented the three-element (triode) "grid audion" vacuum-tube. how vacuum tubes
worked was not understood at the time. de forest's initial audions did not have a high vacuum and developed a blue glow at modest plate voltages; de forest improved the vacuum for federal telegraph. [ ] by , vacuum tube operation was understood, and regenerative circuits using high vacuum tubes were...
https://en.wikipedia.org/wiki/Edwin_Howard_Armstrong
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