Vacuum — Tube

Introduced the grid for amplification.

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

Positively charged electrode that attracts the electrons. Introduced the grid for amplification

Basic rectifiers, converting AC to DC.

Include additional grids to improve efficiency and reduce signal distortion. vacuum tube

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

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