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ID = 14280
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to HAD = C23B
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):

Base British-7-Pin, old (M7A) (Codex=Nb) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 13 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC

Typ:- Va 200; Ia 4.5mA; Vg -2.0; Ra 18,000; gm 2.9

Information source History of the British Radio Valve to 1940   p. 146 & 179
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49

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