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ID = 21912
Brand: Werk für Fernmeldewesen (OSW, HF, WF) Berlin, VEB, RFT (Ostd.)
Tube type:  Double Triode   VHF 
Identical to OSW2025 = ECC91 = 2025_OSW = HF2025
Similar Tubes
Normally replaceable-slightly different:
  6J6 ; 6Н15П

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip
18 x 52 x mm / 0.71 x 2.05 x inch
Weight 8 g / 0.28 oz
Information source

2025_ecc91.gif OSW2025: RFT Röhrentaschenbuch 1954
Wolfgang Eckardt

Just Qvigstad
OSW2025: Radio u. Fernsehen 5/55
Wolfgang Eckardt

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