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ID = 27772
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Thyratron 
Identical to 5557 = FG17 = ST17 = CV2957 = 718_Thyratron = 1701_Amperex = NL-715 = TT-17_Taylor = CE-309 = 967 = E5000/05 = PL5557 = WT-272 = MT17 = XG5-500 = PL17
Similar Tubes
Normally replaceable-slightly different:
  KY866 ; Ste2500/05/2

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

This tube is a thyratron version of the 866A. Also made in Italy by Fivre.

The tube is a 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.

Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source Tube Lore (II)   p. 90
Babani, International Radio Tube Encyclopaedia   p. 302
Universal Vade-Mecum, Electron Valves and Semiconductor Devices

3l.png 5557: Manufacturer's Literature
Emilio Ciardiello

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Just Qvigstad
5557: Manufacturer's Literature
Emilio Ciardiello

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