Datei:Triode tube 1906.jpgI, the copyright holder of this work, hereby publish it under the following license: English The first triode, the de Forest Audion, invented in 1906
Datei:Early triode vacuum tubes.jpg1080 1756 English: Low power triodes for receivers made by AT&T (Western Electric) 56 322 401 594 1080 1756 High power triodes for transmitters made by AT&T
Datei:Lieben-Reisz vacuum tube.jpglater vacuum tubes, this early tube had mercury vapor inside it to increase the conductivity. A small amount of mercury amalgam in this side tube released
Datei:Triode-english-text.svgCutaway drawing showing the construction of a low power triode vacuum tube. The triode, invented in 1906 by Lee De Forest, was the first device which could