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When were filament tubes invented?

Updated: 11/5/2022
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ChuckSiata

Lvl 1
8y ago

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The first hot filament diode tube was invented in 1904 by Fleming, the first hot filament triode tube was invented in 1907 by DeForest. However it was not until 1913 that it was determined that high vacuum was actually needed for efficient and reliable operation of these tubes. So true hot filament vacuum tubes were not made and used until 1913.

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Wiki User

8y ago
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Wiki User

8y ago

There are several types of filament tubes. The questioner was looking for the 1913 tubes invented by Coolige. These consisted of an evacuated glass envelope which insulates the anode at one end from the carthode at the other. This consisting of the tungsten filament and the anode a water-cooled block of copper.

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