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C-100A

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ID = 46419
       
Country:
United States of America (USA)
Brand: Amperex; New York
Tube type:  SPECIAL TUBE, other or unknown   Text 
  Ca. 1925 up to 1945 very rare. ***
Identical to C-100A
Successor Tubes C-100E   C-100D  

Base 6-Pin-Base U6A, old, USA
Filament Vf 2.5 Volts / If 1.75 Ampere / Direct
Description

Oscillator tube specifically developed by Collins, in partnership with Amperex, to avoid to be sued for patent infringement by RCA, AT&T, Westinghouse and the other owners of the rights for the De Forest triode oscillator circuit. The tube was intended for use in crystal controlled transmitters.

It has an internal anode, surrounded by six filaments and by a special type of control element, two external grids, that reduce the crystal current and contribute toward very persistent and stable oscillation. Manufactured for Collins by Amperex.

Used in the Collins 45A transmitter, introduced in 1935, and in the 30FXC set, 1936. Collins bought the patent rights from Dr. Robert Goddard, the same known for his works on the rockets, who had patented this tube in 1915, even before the triode by De Forest: see US patent 1159209. (Source: Collins Collector Association)

 
Text in other languages (may differ)
  c100a_appa~~2.png
  C-100A: Manufacturer's Literature
Emilio Ciardiello
 
c100a_1.jpg
C-100A: Private collection
Emilio Ciardiello

 

from Just Qvigstad

Usage in Models 1= 1936

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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