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ID = 19011
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Universal 
Identical to 4215AB = 4001AB
Similar Tubes
Normally replaceable-slightly different:
Other base:
  215A ; 215A_Nissl ; 4215A

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 1.1 Volts / If 0.25 Ampere / Direct / Battery =
Description Similar to the 215A but European B4 socket. 
Information source Saga of the Vacuum Tube, Tyne   

b4_1~~80.png 4215AB: Fin Stewart
Fin Stewart

Just Qvigstad
4215AB: own collection
Peter den Boer

More ...
Usage in Models 1= 1924

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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