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ID = 38027
Great Britain (UK)
Brand: British Tungsram Radio Works Ltd.
Tube type:  Triode, vacuum   Universal 
Identical to HL4+
Similar Tubes
Other base and data slightly different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Specified voltage AC/DC

Va <250; Gm 3.5 mA/V at Ia= 5 and -Vg= 4.5. Ra 11,000 ohms.

Information source - - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia   p. 108 & 109

Just Qvigstad

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