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R75

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ID = 14646
       
Country:
France
Brand: Dario (tubes) - voir aussi La Radiotechnique
Tube type:  Triode, vacuum   Universal 
Identical to R75
Similar Tubes
Normally replaceable-slightly different:
  A409 ; DZ1508
First year 1928 Saga of the Vacuum Tube, Tyne page 403
First Source (s)
10.Dec.1928 : -- Original prospect or advert "Le Mercure Africain"
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
1_203.png R75: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		r75dariodatasmall.png
R75: own collection
Peter den Boer
More ...
Usage in Models 1= 1927 ; 1= 1928?? ; 1= 1928? ; 4= 1928 ; 3= 1929? ; 6= 1929 ; 1= 1930
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):17

Collection of

Christian ADAM (F)
Patrice Zeissloff (F)
Rudolf Osterkamp (D)
 
r75.jpg

R75
 
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