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ID = 8015
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Half-Wave Rectifier, gasfilled 
  Ca. 1925 up to 1945 rare.
Identical to NU13A = CV1266 = 4476A = AU12
Similar Tubes
Normally replaceable-slightly different:

Base L4 British large 4 pin (1922, LG4)
Was used by Military and/or Government
Filament Vf 6 Volts / If 2 Ampere / Direct

Ruggedized version of U15. Ribbed plate, rigidly supported by U-shaped hoists. Ceramic spacers.

Information source Taschenbuch zum Röhren-Codex 1948/49   
NU13A: Private collection
Emilio Ciardiello

NU13A: Fin Stewart
Fin Stewart

NU13A: Manufacturer's Literature
Emilio Ciardiello

from Just Qvigstad

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