File:Audion vacuum tube construction.png

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English: Construction of the Audion, the first triode vacuum tube, invented in 1906 by Lee De Forest. Part of the tube base is shown removed to reveal the terminals. The parts are:
F - Cathode consisting of a U-shaped platinum wire filament heated to incandescence by a current
G - Grid consisting of a 25 mil nickel wire in a zigzag shape
P - Plate (anode) electrode consisting of 9/16 in square of 5 mil sheet nickel
E - Evacuated sealed glass envelope. In later vacuum tubes this was evacuated to 10-9 atmosphere. In the Audion some gas was deliberately left in the tube.
T - Terminal pins plugged into a socket to connect the tube to the external circuit. The filament in vacuum tubes eventually burned out so they had to be replaced periodically.
The spacing between the filament, grid and plate in the drawing is exaggerated for clarity; in actual tubes the elements were only about 1 millimeter apart. Alterations to image: Removed existing labels and replaced them with red labels.
Date
Source Retrieved 17 October 2013 from Basic Theory and Application of Electron Tubes, US Dept. of the Army Technical Manual TM 11-662, February 1952, p. 4, fig. 4 on Pete Miller's tubebooks.org website
Author K. E. Thiebaud

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Date/TimeThumbnailDimensionsUserComment
current22:12, 28 November 2013Thumbnail for version as of 22:12, 28 November 2013637 × 898 (17 KB)Chetvorno (talk | contribs)Put labels next to elements they refer to and removed pointers
17:59, 20 October 2013Thumbnail for version as of 17:59, 20 October 2013719 × 907 (18 KB)Chetvorno (talk | contribs)User created page with UploadWizard

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