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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.
Filament Vf 13 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC

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

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

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