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ID = 28712
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Screen-grid Tetrode   Text 
Identical to CV313 = QYS50-P40
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general Wires only.
Was used by Radar
Filament Vf 11.5 Volts / If 68 Ampere / Direct

Pulse Modulator with Silica envelope. Va<55kV, Ik<50A peak. Pa<700W. Gm=38mA/V at Ia=30A and Va=10kV. Developed by Mullard against the VX313 specification, issued as the CV313 and later the commercial valve QYS50-P40

Around 1950 three CV313 tubes in parallel were used to generate 2 MW pulses to drive the magnetron transmitter in the Naval Type 992 radar. They operated untill they were replaced by a smaller hydrogen thyratron in the sixties.

Dimensions (WHD)
incl. pins / tip
100 x 500 x mm / 3.94 x 19.69 x inch
Information source - - Manufacturers Literature   
-- Original-techn. papers.   
CV313: Private collection
Emilio Ciardiello

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