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ID = 25738
Brand: Siemens (& Halske, -Schuckert Werke SSW, Electrogeräte); Berlin, München
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Thyratron   Power-supply 
Identical to Ste1000/2,5/15 = ST57 = PL57

Base 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 vapor 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 circuits where current flow is desired in the absence of grid excitation. Grid voltage -1.75 at 100 anode volts and -6.5 grid volts at 1000 anode volts. 
Dimensions (WHD)
incl. pins / tip
50 x 180 x mm / 1.97 x 7.09 x inch
Weight 142 g / 5.01 oz
Information source -- Collector info (Sammler)   

ste10002515_so.png Ste1000/2,5/15: Valvo Röhrentaschenbuch 1957
Anonymous 10 Collector

Ste1000/2,5/15: Siemens Röhrentaschenbuch 1972
Anonymous 10 Collector

Collection of

Collection of a member from D
Collection of a member from D


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