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Child's law and space charge limited emission
editThe description of Space charge should mention Child's law, which works as long as the cathode temperature is high enough, which as far as I know is usual in vacuum tubes. Electrons come off the cathode until the field is zero, due to the space charge itself. This give the quantity perveance, a characteristic value for space charge limited emission. Gah4 (talk) 20:11, 31 August 2021 (UTC)
powered
editNo comment on hyphenating vacuum tube, but note that a high power tube is not necessarily high powered. A high power tube means that it can switch a lot of power, but it doesn't necessarily use (or dissipate) so much power itself. Gah4 (talk) 12:25, 10 February 2022 (UTC)
modern electronics
editAs for a recent edit, it does seem to me that the triode, which allows for amplification, was the beginning of actual modern electronics. Yes the thermionic diode, and also the semiconductor (point contact) Cat's whisker rectifier were earlier, but without amplification, weren't really modern electronics. Gah4 (talk) 02:12, 2 February 2024 (UTC)
Improper use of anode and cathode
edit"Electrons can flow in only one direction through the device: from the cathode to the anode". I think, by definition, electrons flow from the anode to the cathode. To match the convention used later in the paragraph, it should say: Conventional current can only flow in one direction through the device: from the cathode to the anode. GigaBrad (talk) 00:23, 22 February 2026 (UTC)
Wording
editIt's "valve" not "tube", please fix. The language is English, not some revolting Yank patois. — Preceding unsigned comment added by ~2026-12411-28 (talk) 19:02, 31 March 2026 (UTC)