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ID = 20894
Tube type:  Thyratron   Power-supply 
Identical to PL57 = Ste1000/2,5/15 = 5559

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
Description 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. 
Tube prices 1 Tube prices (visible for members only)
Information source -- Collector info (Sammler)   

Egon Strampe

pl57_so.png PL57: Valvo Röhrentaschenbuch 1957
Anonymous 10 Collector

Just Qvigstad
PL57: Kretzmann, Schaltungsbuch, 1955
Anonymous 15 Collector

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