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Any device that incorporates an evacuated chamber in which free-floating electrons are manipulated.

4
votes
Apart from tube design specifics (see what is said about grid shapes in other answers), circuit design keeping the grid sufficiently biased negative does. "Grid current" is a well known phenomenon wi …
answered Apr 30 by rackandboneman
1
vote
6.3V tubes became common at the time the first car radios (and, I suspect, other vehicle-mounted electronics, usually not for personal civilian use) were developed. 6V was the standard for car batter …
answered Mar 15 '17 by rackandboneman