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hot-cathode discharger lamp ILLUMIN

hot-cathode rectifier SCIENZE

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From the 1920s to the 1960s, virtually every electronic device used hot cathode vacuum tubes.
en.wikipedia.org
The advantage of a hot cathode is the precisely controllable high beam intensity allowing to stimulate the emission of light even on weakly luminescing materials (e.g. quartz - see picture).
en.wikipedia.org

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