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ID = 20991
Tube type:  Noise Diode 
Identical to K81A = R290

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 1.85 Volts / If 2.5 Ampere / Direct

100V anode voltage, 15 mA. 13 dB noise level across 50 ohms load. Useful up to 300MHz.

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Information source - - Manufacturers Literature   
  K81A: Funktechnik 18/65
Egon Strampe
K81A: Private collection
Emilio Ciardiello

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K81A: RTT Schwandt
Günther Stabe † 19.8.20

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K81A: Valvo-Handbuch Spezialröhren 1963
Anonymous 201 Collector

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