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ID = 72730
Great Britain (UK)
Brand: British Tungsram Radio Works Ltd.
Tube type:  Vacuum Pentode   Power/Output 
Identical to APP4A_5PIN
Similar Tubes
Other base:
  APP4A ; APP4As

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.2 Ampere / Indirect / Specified voltage AC/DC

Also available in a 7-pin version

Information source - - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia   
History of the British Radio Valve to 1940
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

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