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Vacuum tube seems too specific. They aren't all tubes and they don't all have a vacuum. Thermionic valve seems better ? - Rod57 (talk) 17:29, 9 April 2018 (UTC)
Note, though, that many of what are called vacuum tubes aren't very tube shaped, but are historically included. The magnetron, commonly called magnetron tube, which makes your microwave oven work, is really tube shaped. Gah4 (talk) 08:06, 18 April 2019 (UTC)
This article states that electrons are emitted from the cathode; yet the Wikipedia articles on the Cathode and Anode state that electrons are emitted from the anode. Or, is it that electrodes in vacuum tubes can serve multiple roles: acting as anodes when heated, and cathodes when unheated? Please clarify. — Preceding unsigned comment added by 184.2.141.98 (talk) 14:39, 2 April 2019 (UTC)
The article gives some advantages of vacuum tube rectifiers over galena point-contact rectifiers. One thing, though. In WW2 radar, which was mostly at 3GHz and 10GHz, point-contact detectors were needed as vacuum tubes can't go that fast. Research done during the war, and continuing after, led to the modern semiconductor industry. But yes, for broadcast radio frequencies vacuum tube rectifiers were a better choice. Gah4 (talk) 02:28, 30 January 2020 (UTC)
I've removed this text from the article;
SAGE computers were dual installations, with one operating, and the other in standby. To locate potential tube failures in the standby computer, heater voltages were reduced, which caused failures of tubes which would otherwise fail in service. These computers continued in service years after other tube computers had been superseded.
I think the editor has conflated two issues. In the operating computer, heater voltage was turned on and off daily to preserve tube life, with a steady ramp on each cycle to avoid thermal shock.[1] In the standby computer, the tube inputs were cycled through the extreme range of permissable voltages to bring on early failure of any "dodgy" units (marginal checking).[2]
This could be fixed in the article, but this might be something that is more applicable to the Whirlwind article. SpinningSpark 17:47, 12 May 2020 (UTC)
7 of the first 8 images in this article seem to have been replaced with photos of Honda SUVs. Xzelence (talk) 15:59, 23 July 2021 (UTC)