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ID = 11390
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Developer: Mazda = Valve (Tube) brand GB (see also France) 
Tube type:  Beam Power Tube   beam power   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to NR74 = CV1189 = AC6/Pen = W1301
Predecessor Tubes AC6/Pen  

Base British-7-Pin, old (M7A) (Codex=Ncp) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.7 Ampere / Indirect / Specified voltage AC/DC

This tube is a beam power amplifier designed for use with the output stage of a time base for magnetic TV scanning. The tube has been designed to stand high peak anode voltages required by this class of service. The type number prefix -NR - relates it to the British Royal Navy as a "Navy Receiving" tube. No evidence has so far been found that the tube was given a British Air Force or Army number. It is also available with the CV1189 type numbeer.

Dimensions (WHD)
incl. pins / tip
50 x 135 x mm / 1.97 x 5.31 x inch
Weight 61 g / 2.15 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Collector info (Sammler)   

br739mod_2.png NR74: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
NR74: Manufacturer's Literature
Emilio Ciardiello

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