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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

Lee De Forest: Father of Radio and Inventor of the Audion ...

    https://blog.minicircuits.com/lee-de-forest-father-of-radio-and-inventor-of-the-audion/
    De Forest invented the Audion in 1906, a device that changed the course of radio history in the 19 th century. The three-electrode vacuum tube functioned as a primitive transistor, allowing the amplification of radio signals to enable the broadcast of speech and music, a remarkable upgrade from Morse Code which was the dominant mode of wireless ...

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

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 ...

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 San Francisco.Cunningham started the company in 1915, without patent rights, to compete with Lee de …

14 results for audion deforest tube - ebay.ca

    https://www.ebay.ca/sch/i.html?_nkw=audion+deforest+tube
    DeForest Audion 427 Type 27 Globe Test NOS 1025gm Serious Tubes M951. C $44.98. Top Rated Seller. Top Rated Seller. or Best Offer. +C $16.67 shipping. from United States. Spon.

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