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ID = 21944
Brand: Werk für Fernmeldewesen (OSW, HF, WF) Berlin, VEB, RFT (Ostd.)
Tube type:  Half-Wave Vacuum Rectifier 
Identical to OSW3102 = 3102_OSW
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
1954 : -- Collector info (Sammler) + / - ?

Base SPECIAL TUBEBASE in general
Filament Vf 3 Volts / If 3 Ampere / Direct
Description Hochspannungsgleichrichter 25kV 
Dimensions (WHD)
incl. pins / tip
47 x 129 x mm / 1.85 x 5.08 x inch
Weight 120 g / 4.23 oz
Information source -- Original-techn. papers.   

OSW3102: OSW-Datenblatt 49.6
Wolfgang Eckardt

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