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ID = 83889
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to P100/1250
Similar Tubes
Normally replaceable-slightly different:

Base Jumbo 4-pin bayonet (1918)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3 Ampere / Direct
Dimensions (WHD)
incl. pins / tip
x 58 x 200 mm / x 2.28 x 7.87 inch
Information source Babani, International Radio Tube Encyclopaedia   p. 211 & 212
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 369,p. 842 & 843

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