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R4B_BTH

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ID = 28727
       
Country:
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R4B_BTH = R4B_MO = R4B_Marconi
First year 1922 Saga of the Vacuumtube, Tyne page 220
Predecessor Tubes R4A  

Base Europe 4-Pin (A, 4A, B4, since 1914)
Was used by Military and/or Government
Filament Vf 3.5 Volts / If 0.46 Ampere
Description

The R4B tube was first made in 1918 and had an E12 base. In the following years, this was changed to B4 but date of the changeover is uncertain.

 
Text in other languages (may differ)
Literature British Radio Valves - The Vintage Years, Thrower   pages 27 & 40
Saga of the Vacuumtube, Tyne   Page220
 
b4_1~~69.png
R4B_BTH: Fin Stewart
Fin Stewart

 

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