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ID = 86885
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  TRIODE (Detail uncertain)   Audio Frequency 
Identical to R3B

Was used by Military and/or Government
Filament Direct

This tube has been located and is shown as made for the Bitish Air Ministry. It is not listed in any references, As it has the type nmber R3B, it may be a later version of rhe R3 (aka Q) which was made before 1920.

Information source -- Collector info (Sammler)   



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