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ID = 30724
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Half-Wave Vacuum Rectifier   Text 
  <1925 very rare. ***
Identical to VT11_GPO = MR4_MOV = CV1611

Base Wires Wires only.
Was used by Telephony
Filament Vf 12.5 Volts / If 6.3 Ampere / Direct / Specified voltage AC/DC

10kV piv, 160mA mean dc output. Designed by MOV for the British Post Office and first made1921. 255 tubes were produced. They were used at the Lands End Radio Station. Also made by Ediswan.

Information source Babani, International Radio Tube Encyclopaedia   
-- Original-techn. papers.   


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