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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 = TB42 = H410D = B442
Similar Tubes
Normally replaceable-slightly different:
  4619_WLS ; WLS581
First Source (s)
1926 : Saga of the Vacuum Tube, Tyne p.403
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Bo) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description

Codex falsch erfasst!

 
Information source Röhren-Vademecum; P.H. Brans; Antwerpen   p. 70
-- Collector info (Sammler)   
Taschenbuch zum Röhren-Codex 1948/49
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
r81_so.png R81: rtt
Anonymous 10 Collector

Just Qvigstad 		dario_r81_caracteristiques.png
R81: Catalogue RADIOTECHNIQUE 1929
Christian ADAM
More ...

Collection of

Rudolf Osterkamp (D)
 
dario_r81_bild1.jpg

R81
 
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