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ID = 28649
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  <1925 rare.
Identical to MR4_MOV = VT11_GPO = CV1611
First year 1922 Saga of the Vacuum Tube, Tyne page 381
First Source (s)
May.1919 : British Radio Valves - The Vintage Years: 1904-1925 p.127

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

Pa <300, Va <10,000, (RFJ). First made by Osram Lamp Works of GEC May 1919

Dimensions (WHD)
incl. pins / tip
120 x 255 x mm / 4.72 x 10.04 x inch
Information source - - Data from my own collection   
Saga of the Vacuum Tube, Tyne   Page 381
The Saga of Marconi Osram Valve
- - Manufacturers Literature

MR4_MOV: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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