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R2A

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ID = 28723
       
Country:
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Gas Triode   Detector 
Identical to R2A
Similar Tubes
Normally replaceable-slightly different:
  R2_England
First year 1918 ?? Saga of the Vacuumtube, Tyne page 216
First Source (s)
Sep.1917 : British Radio Valves - The Vintage Years, Thrower p.25
Sep.1917 : Saga of the Vacuumtube, Tyne
Predecessor Tubes R2_England  

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 3.3 Volts / If 1.1 Ampere / Direct / Battery =
Description

Soft valve of similar construction as the French TM. Filled with Helium at a pressure of 0.6 mm Mercury. Thrower quotes 1.2 Amp at 3.5 Volts.

Exhibited by MoV at Physical Society display in London in 1920.
The anode voltage range quoted was 23 to 40 volts.
The MES cap was an option.

 
 
marconi_r2a_bild1.jpg
R2A: Harmsworths Wireless Encyclopedia Third Volume
Rudolf Osterkamp

 

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