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ID = 27781
Tube type:  Thyratron   Power-supply 
Identical to 5720 = FG33 = GL5720 = CV742

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial
Filament Vf 5 Volts / If 4.5 Ampere / Direct
Description Anode voltage 1000, grid voltage +10 Gas-mercury triode thyratron. It is has a positive control characteristic which offers the advantage of a tube that will operate only with a positive voltage on the grid and it is ideally suited for applications which require that no current flow in the absence of grid excitation. Made by GE, Hytron, Philips, Westinghouse; also produced in Italy by Fivre. 
Information source Essential Characteristics, GE 1973   
- - Manufacturers Literature   
Tube Lore (I)

Just Qvigstad
5720: Manufacturer's Literature
Emilio Ciardiello

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