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ID = 31398
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Transmitting Tetrode, air cooled   Universal 
Identical to QY4-400 = 4-400A = CV5959 = E400A = C1136

Base TRANSMITTER-Base in gneral Top contact with a cap
Filament Vf 5 Volts / If 14.1 Ampere / Direct / Parallel, (AC/DC)
Description Pa <400W 
Dimensions (WHD)
incl. pins / tip
87 x 150 x mm / 3.43 x 5.91 x inch
Weight 190 g / 6.70 oz
Information source - - Manufacturers Literature   
QY4-400: Foto 2013 by Stefan Heimers
Stefan Heimers

QY4-400: Manufacturer's Literature
Emilio Ciardiello

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