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ID = 10470
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Double Diode-Pentode   RF/IF-Stage 
Identical to WD40
Similar Tubes
Heater different:

Base B9 British 9-Pin (Codex=Yk) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect

4V heater NOT 2V as in the Roehren-Codex 1948/49.

General-purpose for RF IF and AF use.

Information source The Saga of Marconi Osram Valve   p. 28, 149 & 335
- - Manufacturers Literature   Advertisement Nov 1935
History of the British Radio Valve to 1940
Taschenbuch zum Röhren-Codex 1948/49

wd40_sock.png WD40: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

Just Qvigstad

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