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ID = 53768
United States of America (USA)
Brand: National Electronics, Inc.; Geneva, IL
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Thyratron   Power-supply 
Identical to NL-5559/FG-57
Similar Tubes
Other shape (e.g. bulb type):
  5559 ; 5559/FG-57 ; FG57

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 / Half indirect
Description This NL prefix is used for this 5559 FG-57 tube made by National Electronics. This tube is a negative control mercury vapour type for use where it is desired to actuate 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 excitation. 
Dimensions (WHD)
incl. pins / tip
2 x x mm / 0.08 x x inch
Weight 142 g / 5.01 oz
Information source - - Manufacturers Literature   
-- Collector info (Sammler)   
George Papaiz

NL-5559/FG-57: Fin Stewart
Fin Stewart

NL-5559/FG-57: Manufacturere's literature
George Papaiz

from Just Qvigstad

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