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ID = 11559
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Vacuum Pentode   Power/Output 
Identical to PT235
First year Sep.1928 - - Manufacturers Literature leaflet
First Source (s)
1938 : History of the British Radio Valve to 1940 p. 185
Oct.1928 : - - Manufacturers Literature Date of Marconi Publication No. 520A.

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Specified voltage AC/DC

Manufacturer's announcing data gives the filament current as 0.35A rather than the Codex figure of 0.2A
Ra = 55k ohms at Va = 150. G=90

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

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