Tube — Vacuum

Include additional grids to improve efficiency and reduce signal distortion.

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

Basic rectifiers, converting AC to DC.

Introduced the grid for amplification.

Positively charged electrode that attracts the electrons. Include additional grids to improve efficiency and reduce

A glass or metal container that prevents air molecules from disrupting electron flow. Common Types vacuum tube