Tag Archives: Vacuum tube

Vacuum tube – BASIC ELECTRONICS TUTORIAL

Vacuum tubes on a Philco model 20 tabletop radio set.

In electronics, a vacuum tube or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a …

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