However, it was Lee De Forest who is credited with inventing the triode tube in 1907 while continuing experiments to improve his original Audion tube, a crude forerunner of the triode.
42.
The autodyne circuit was invented by Edwin Howard Armstrong of Columbia University, New York, NY . He inserted a tuned circuit in the output circuit of the Audion vacuum tube amplifier.
43.
By 1928, DuMont was searching for new opportunities and was wooed by Dr . Lee De Forest, a radio pioneer who developed the audion tube, the original voice amplifier for radio reception.
44.
Instead of trying to stabilize the partial vacuum, he wondered if it was possible to make the Audion function with the total vacuum of a Kenotron, since that was somewhat easier to stabilize.
45.
A pair of audion tubes connected in push pull is described in Edwin H . Colpitts'US patent 1137384 granted in 1915, although the patent does not specifically claim the push pull connection.
46.
The Marconi magnetic detector was the " official " detector used by the Marconi Company from 1902 through 1912, when the company began converting to the Fleming valve and Audion-type vacuum tubes.
47.
He soon realized that his " vacuum " Audion had markedly different characteristics from the De Forest version, and was really a quite different device, capable of linear amplification and at much higher frequencies.
48.
After the war, Theodore Case and Earl I . Sponable collaborated with fellow wireless communications pioneer Lee de Forest, inventor of the Audion tube, to apply their optical sound system to motion pictures.
49.
Compared to all competing devices at the time, the Audion was unique in that it did not draw significant power from antenna / tuned circuit, which allowed the tuning circuitry to operate with maximum selectivity.
50.
However actual amplification by a vacuum tube only became practical with Lee De Forest's 1907 invention of the three-terminal " audion " tube, a crude form of what was to become the triode.
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