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222

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ID = 21341
       
Country:
United States of America (USA)
Brand:
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 222 = 22 = UX222 = PH222 = OK-X-222 = CX322 = SX222 = RayX-222 = ER222 = NU-22
Similar Tubes
Normally replaceable-slightly different:
  RX222 ; X222
First year Oct.1927 Saga of the Vacuumtube, Tyne page 318

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 3 Volts / If 0.13 Ampere / Direct / Battery =
Description

According to Tyne on page 318, extensive experimental work was done at GE during 1924 and 1925 and in July 1926 samples were submitted to RCA, which assigned the type UX222 in November 1926. Production was started at Nela Park and the UX222 was announced by RCA in October 1927. The thoriated filament takes 0.132 ampere at 3.3 volts. The maximum recommended anode voltage is 135 volts and with +45 volts on the screen grid and -1.5 volts on the inner grid it is resulting 1.5 milliampere anode curent. Amplification factor is then 300 and the mutual conductance 350 micromhos.

 
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
0222.jpg
222: KoBi
Konrad Birkner † 12.08.2014

 
222_so.png
222: ARRL Handbook 1972
Michael Schlör

 

Usage in Models 1= 1927? ; 4= 1928?? ; 9= 1928? ; 4= 1928 ; 7= 1929? ; 13= 1929 ; 3= 1930 ; 2= 1931??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):43


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