English: Advertisement for the
Audionvacuum tube invented by
Lee De Forest in 1907, from The Electrical Experimenter magazine, August 1916, volume 4, number 4, page 228. This was the first
triode, the first vacuum tube that could
amplify electrical signals. It was used by amateur experimenters as well as commercial companies to build the first amplifying radio receivers, as indicated in the advertisement. By the time of this advertisement, improved versions were being sold by General Electric and other manufacturers, as shown by De Forest's efforts to differentiate his product.
Date
Magazine published August 1916; this page scanned February 2008.
Source
English: The Electrical Experimenter magazine, August 1916, volume 4, number 4, page 228. This page was scanned by
Swtpc6800 on an Epson Perfection 1240U at 300 dpi with half-tone de-screening enabled, and stored as an TIFF. The image was cropped and touched up in Adobe Photo Elements 5.0. This copy was saved as a 150-dpi PNG file.
Author
Published by Experimenter Publishing Company Inc,. 233 Fulton Street, New York, N.Y. Hugo Gernsback, President; Sidney Gernsback, Treasurer; Milton Hymes, Secretary.
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copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Audion_vacuum_tube_advertisement.png
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== Summary == {{Information | Description= ''The Electrical Experimenter'', August 1916. | Source=This page was scanned by
User:Swtpc6800 on an Epson Perfection 1240U at 300 dpi with half-tone de-screening enabled and stored as TIFF. The image was cr
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