Originally developed for use for radio amateurs in
1920, the valve called triode of Audion RAC3, manufactured
for american engineer Elman B. Mayers, showing the metal
contacts for its setting in the circuit. To notice that
this valve also takes the name of Audion. In the beginning
thermoionic history in U.S.A., many had been the manufacturers
of valves that they had bothered DeForest with its patent
of 1907. Mayers was one of them and more developed this
valve for ends of the radio-fanso of that professional
transmission. It happens that for return of 1920 to
all powerful RCA it took account of this market. The
powerful Sarnoff, director of the RCA, through justice,
ordered to arrest all those that do not pay license
to manufacture valves. It did not give another one,
Mayers an active engineer mounted its it manufactures
about 15 km of the American border, in Canada, and started
to sale its valves for order. Many had followed the
steps of Mayers, using the same strategy and had been
called in the thermoionic history as a independent manufacturer.
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