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DeForest Tubular Audion - sparkmuseum.com
http://www.sparkmuseum.com/AUDION.HTM
DeForest Tubular Audion 1916 Prior to about 1915, DeForest enjoyed what was largely a monopoly position in vacuum tubes and the company was able to impose very restrictive sales policies. At the time the only way to obtain a DeForest …
DeForest Audion Tube, Type D-01A, circa 1924 - The …
https://www.thehenryford.org/collections-and-research/digital-collections/artifact/256334
In 1906, De Forest invented the Audion tube, allowing the detection and amplification of weak radio signals. As the first triode vacuum tube, the Audion revolutionized radio broadcasting--and made it more practical. By the late 1920s, …
RadiolaGuy.com : deForest spherical audion : deForest ...
http://www.radiolaguy.com/Tubes/Deforest_Audion_Tubes.htm
deForest tubular audion tube; Antique vacuum tubes for sale; rare radio tubes
T_deForest , Tube T_deForest; Röhre T_deForest ID28807, Trio
https://www.radiomuseum.org/tubes/tube_t_deforest.html
tubular audion from 1912, made by McCandless. initially sold only together with Audion (e.g.RJ-4). From April 1916 on also offered separately for sale. Information source-- Original prospect or advert in Tyne Fig.7-11, p.120
Antique De Forest Type T Tubular Audion Bulb / Tube ...
https://www.ebay.com/itm/334106411757
3 De Forest Audion Cans + 1 DeForest Audion Radio Tube. $15.90. + $17.75 shipping. + $17.75 shipping + $17.75 shipping. 1924 Atwater Kent 10C Breadboard Radio. $1,380.00. + $60.00 shipping + $60.00 shipping + $60.00 shipping. Picture Information. Hover to zoom.
Cunningham Audio-Tron Tubular Vacuum Tube, ca. 1916 ...
https://artsandculture.google.com/asset/cunningham-audio-tron-tubular-vacuum-tube-ca-1916-elmer-tiling-cunningham-1889/nwGPvs35surVkA
Elmer T. Cunningham produced this tubular double filament triode vacuum tube, which he called an "Audio Tron," around 1916 at his Audio Tron Sales Company in …
De Forest Ultraudion Detector — Calisphere
https://calisphere.org/item/43d228e595290fae1d093ab0ce003047/
"There is only one audion, the de Forest" ad for the De Forest Ultraudion Detector for damped and undamped waves, from the DeForest Radio Telephone & Telegraph Company, 101 Park Avenue, New York. Photos of the Type UJ1 DeForest Ultraudion Detector, and the Genuine DeForest Tubular Audion. Type image Format Black & White Identifier
Tubes/Valves - SparkMuseum
http://www.sparkmuseum.com/TUBES.HTM
Deforest Tubular Audion (U.S.) 1916. Click here for more information: Osram R2A (British) 1919: DeForest Spherical Audion c. 1914 : Expanse "B" (Australian) c. 1919: Deforest Long Plate Spherical Audion c. 1915 This is the tube that made long distance telephone possible. Radion GP (British) 1926: Cossor A.U.3 Early EHT Rectifier: Marconi Osram DE6 (British) 1925
Moorhead - bill01a.com
http://bill01a.com/articles/moorhead.htm
DeForest charged high prices for his audions and only sold them as part of his detector units. He told Forbes that he was going to manufacture tubes, copied after DeForest, and that DeForest was such a poor businessman that he would never sue them.[3] Forbes put $200 into the venture, and $500 came from a man named Kendrick.
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