Category:Audion

This category is for the Audion, the first three-terminal (triode) electronic vacuum tube, invented by Lee De Forest in 1906, and other early three-terminal tubes invented around that time, such as the Lieben-Reisz tube.

Subcategories

This category has the following 3 subcategories, out of 3 total.

Media in category "Audion"

The following 36 files are in this category, out of 36 total.