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ID = 28814
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Transmitting Triode, air cooled   Power/Output 
  <1925 very rare. ***
Identical to T250_MO
Similar Tubes
Heater different:
First year 1922 Saga of the Vacuum Tube, Tyne page 381
First Source (s)
1919 : British Radio Valves - The Vintage Years, Thrower p.69,128

Base Wires Wires only.
Was used by Transmittertube (Radio)
Filament Vf 12.5 Volts / If 5.5 Ampere / Direct / Specified voltage AC/DC

double ended 250 Watt valve. 2000 to 4000V anode voltage.

Dimensions (WHD)
incl. pins / tip
125 x 280 x mm / 4.92 x 11.02 x inch
Weight 339 g / 11.96 oz
Information source - - Manufacturers Literature   Marconi catalog No. 520, Sept. 1928
The Saga of Marconi Osram Valve   Pages 23 & 77
T250_MO: Manufacturer's Data
Roy Johnson

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Usage in Models 1= 1922?? ; 1= 1925

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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