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R81

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ID = 8092
       
Country:
France
Brand: Dario (tubes) - voir aussi La Radiotechnique
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to R81 = B442 = TB42 = H410D
Similar Tubes
Normally replaceable-slightly different:
  4619_WLS ; WLS581
First Source (s)
1926 : Saga of the Vacuumtube, Tyne p.403

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Bo) Top contact screw type
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description Codex falsch erfasst! 
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
dario_r81_bild1.jpg
R81: R.Osterkamp
Rudolf Osterkamp

 
r81_so.png
R81: rtt
Michael Schlör

 
dario_r81_caracteristiques.png
R81: Catalogue RADIOTECHNIQUE 1929
Christian ADAM



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