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File:Early triode vacuum tube collection.jpg

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Summary

Description
English: Collection of early triode vacuum tubes belonging to American inventor Lee De Forest, the inventor of the triode, from 1920. Description of tubes from caption (VF is the filament voltage, VP is the plate voltage, tubes in row numbered L to R)
Large tube, left: 1/2 kW oscillator tube VF = 37 V, VP = 1500 V
Top row: (1) Spanish type B, VF = 6, VP = 20-150, (2) Pre-WW1 De Forest "ultra-audion", VF = 3.5, VP = 20, (3) Spanish "Compagne Espanole" receiving tube, VF = 3.5, VP = 20, (4) Moorhead receiver, VF = 4, VP = 40-500,
Two small tubes, center: (1) Early De Forest Audion, 1906, (2) Historic Audion from battleship Georgia used in 1908 US Navy round-the-world cruise which demonstrated value of wireless on Naval ships, VF = 3.5, VP = 25
Bottom row: (1) Western Electric VT-1, F = 6, VP = 40, (2) Old style De Forest oscillator, VF = 7, VP = 350, (3) Small power tube, detector, amplifier, oscillator, VF = 7, VP = 500, (4) VT-21 Signal Corps detector, VF = 4, VP = 20-40, (5) Navy detector tube with rare earth oxide filament, VF = 6, VP = 40
Date
Source Downloaded September 2, 2013 from Hendrik van der Bijl "Practical operation of thermionic detectors" in Scientific American (Scientific American Publishing Co., New York), Vol. 96, No. 2, February 1920, p. 130 on Google Books
Author Lee De Forest

Licensing

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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vacuum tube

collection

Audion

triode

inception

February 1920Gregorian

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