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ID = 28641
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  High-vacuum Rectifier   Power-supply 
  <1925 no serial production. For instance only development samples. *****
Identical to ERECT
First year 1922 Saga of the Vacuum Tube, Tyne page 381
First Source (s)
1916 : British Radio Valves - The Vintage Years, Thrower p.67,68

Filament Vf 6 Volts / If 4.3 Ampere
Description Designed by Round for experimental use. Double ended. Source of power was a 10" spark coil. Such was the available H.T. source on board of the Navy vessels. 

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