Image: Early triode vacuum tube collection
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Description: 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)
Title: Early triode vacuum tube collection
Credit: 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
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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