Antique radios, Old Time Radios

222

Country:	United States of America (USA)	Brand:	Common type USA
		Developer:	General Electric Co. (GE); Bridgeport (CT)
		Tube type:	Screen-grid Tetrode RF/IF-Stage

Tube ID = 21341


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Identical to	222 = 22 = UX222
First Series	Oct.1927 Saga of the Vacuumtube, Tyne page 318

Base	UX-Base (4 Pins (2 thick, USA 1924, UX)
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

KoBi
Konrad Birkner

ARRL Handbook 1972
Michael Schlör

Usage in Models (calculation each 25th of the month)	1= 1927? ; 4= 1928?? ; 9= 1928? ; 5= 1928 ; 6= 1929? ; 9= 1929 ; 1= 1930 ; 1= 1931?? ;
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 36

No further Information for

222

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