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ID = 31343
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Thyratron 
Identical to XG5-500 = PL17 = FG17 = 5557

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial
Filament Vf 2.5 Volts / If 5 Ampere / Direct / Specified voltage AC/DC

This tube isa negative control mercury vapor thyratron for use where it is desired to acuate the tube with a change in negative grid voltage. It requires relatively little grid power and is suitable for use in relay circuits where current flow is desired in the absence of grid exitation.
Ia <0.5A mean

Dimensions (WHD)
incl. pins / tip
67 x 292 x mm / 2.64 x 11.50 x inch
Weight 114 g / 4.02 oz
Information source - - Manufacturers Literature   
Tube Lore (II)   p. 90

3l_5557~~1.png XG5-500: Fin Stewart
Fin Stewart

Just Qvigstad
XG5-500: Mullard-original papers
Otto Galli

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