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ID = 31380
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Half-Wave Rectifier, gasfilled 
Identical to RR3-1250
Similar Tubes
Other base:
Other base and data slightly different:

Base Top contact with a cap.
Filament Vf 5 Volts / If 7 Ampere / Direct / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
59 x 200 x mm / 2.32 x 7.87 x inch
Information source - - -   
- - Manufacturers Literature   
- - -
- - -
RR3-1250: Manufacturer's Literature
Emilio Ciardiello

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