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ID = 3614
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to UX222 = 222 = OK-X-222 = CX322 = X222 = 4603_WLS = 57T222 = SX222 = TX-222 = NX-222 = RayX-222 = SLX222 = ER222 = RYB222 = T-22DC = NU-22 = X222RF = PM222
Similar Tubes
Normally replaceable-slightly different:
  22 ; 422 ; PT-222 ; RF22
First year Oct.1927 Saga of the Vacuum Tube, Tyne page 318 + Tube brochures collection E.Erb
First Source (s)
Feb.1927 : Saga of the Vacuum Tube, Tyne

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

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.

Only the UY227 from Westinghouse was some months earlier as first screen grid tube for (battery) radios in the USA. The first AC screen grid tube, the UX224, followed in 1929. Those three types were getting rid of neutralization to be necessary.

Dimensions (WHD)
incl. pins / tip
x 123 x 45 mm / x 4.84 x 1.77 inch
Weight 49 g / 1.73 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia
UX222: JV
Jay Vonderhey

More ...
UX222: Telefunken Werkstattbuch
Wolfgang Bauer

More ...
UX222: RCA Tube Manual RC-10
Heinz Höger

from Just Qvigstad

Usage in Models 3= 1927? ; 1= 1927 ; 1= 1928? ; 10= 1928 ; 2= 1929? ; 22= 1929 ; 2= 1930

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):41

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