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ID = 61721
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Thyratron   Power-supply 
Identical to GL5559 = 5559 = PL5559 = FG57
First year 26.Oct.1946 Electron Tube Registration List

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 / Specified voltage AC/DC

Mercury-vapour thyratron triode, for use as relay, motor control, battery chargers, variable rectifiers and for ignitron firing. 1000V PIV, 2.5A average current.

GE registered tube as 5559, distributed it as GL-5559. Earlier known as the FG57

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
76 x 178 x mm / 2.99 x 7.01 x inch
Weight 125 g / 4.41 oz
Information source - - Manufacturers Literature   
GL5559: Fin Stewart
Fin Stewart

GL5559: Manufacturers documentation 1947
Bruce Morgenstern

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