Tube: Vacuum

A (or thermionic valve) is an electronic component that controls electric current flow within a high-vacuum sealed container. Primarily used in early electronics, they amplify, switch, or regulate signals by controlling the movement of electrons emitted from a heated surface. Core Components

Examples include "magic eye" tubes for signal display, thyratrons, and magnetrons. Key Technical Details vacuum tube

Positively charged electrode that attracts the electrons. A (or thermionic valve) is an electronic component

Placed between cathode and anode to control the volume of electrons. vacuum tube

Heated (white-hot) to "boil off" electrons via thermionic emission.

Basic rectifiers, converting AC to DC.

Introduced the grid for amplification.