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ID = 28588
Tube type:  Triode, vacuum   Universal 
Identical to HE6
Similar Tubes
Heater different:
First year 1924 Saga of the Vacuumtube, Tyne page 393
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower p.59

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 3.5 Volts / If 0.15 Ampere / Direct / Battery =
Description Hersteller: Penton Engineering Co., GB 

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