File:Early triode vacuum tube collection.jpg

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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

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