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| Keywords: Early triode vacuum tubes.jpg triode vacuum tubes from around 1918 all derived from the Audion tube invented by Lee De Forest in 1906 The recognition of the Audion's ability to amplify signals around 1912 caused its rapid development by several organizations Bottom row D Audions made by De Forest's company 3rd row C General Electric tubes invented by Irving Langmuir called Pliotrons 2nd row B Tubes developed by Western Electric Bell Telephone Co who bought the Audion rights from De Forest; these were used in the first telephone line repeaters which made the first transcontinental telephone service possible in 1915 Top row A French tubes De Forest let his French patent rights to the Audion lapse in 1912 through lack of a 125 filing fee and the French government manufactured hundreds of thousands of these tubes during World War 1 <br /><br /> The triode consists of an evacuated glass bulb with three electrodes inside a heated filament a control grid consisting of a screen of wires and a metal plate The American tubes B C and D were all constructed with a filament in the center with the grid consisting of two flat screens on either side and the plate consisting of two flat metal plates outside that The French tubes A had a horizontal filament wire surrounded by a grid consisting of a helix of wire surrounded by a concentric plate consisting of a metal cylinder The smaller tubes on the right of each row were used in radio receivers while the larger tubes to the left were higher power types used in transmitters before 1918 Downloaded July 22 2013 from http //books google com/books id KpZEAAAAIAAJ pg PA321 The Principles Underlying Radio Communication National Bureau of Standards radio pamphlet no 40 US Signal Corps December 10 1918 US Government Printing Office p 321 fig 250 on Google Books author PD-USGov ImageNote 1 430 1393 518 345 1080 1756 2 Low power De Forest Audions for receiving ImageNoteEnd 1 ImageNote 2 129 1317 304 421 1080 1756 2 High power Audions which De Forest called Oscillions for transmitters ImageNoteEnd 2 ImageNote 3 831 1004 246 272 1080 1756 2 Low power pliotrons for receiving designed by Irving Langmuir at General Electric ImageNoteEnd 3 ImageNote 4 29 937 802 345 1080 1756 2 High power pliotrons for transmitting designed by Irving Langmuir at General Electric ImageNoteEnd 4 ImageNote 5 451 661 585 263 1080 1756 2 Low power triodes for receivers made by AT T Western Electric ImageNoteEnd 5 ImageNote 6 56 322 401 594 1080 1756 2 High power triodes for transmitters made by AT T Western Electric ImageNoteEnd 6 ImageNote 7 50 18 995 299 1080 1756 2 French triodes ImageNoteEnd 7 Uploaded with UploadWizard Vacuum triodes Early vacuum triodes Audion French triode Loupiote Western Electric vacuum tubes General Electric Pliotrons General Electric vacuum tubes De Forrest Audion | ||||
