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ID = 8221
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to RZ = UR1C = C10B
Similar Tubes
Other base:
First Source (s)
1934 : History of the British Radio Valve to 1940 p. 175

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 20 Volts / If 0.2 Ampere / Indirect / Specified current AC/DC ~ = (Series working)

250V rms input, 75mA mean output current

Information source Taschenbuch zum Röhren-Codex 1948/49   
Michael Schlör


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