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DW7

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ID = 3656
       
Country:
France
Brand: Mazda (tubes), Mazda-Belvu, Compagnie des Lampes; Paris
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to DW7
Similar Tubes
Normally replaceable-slightly different:
  E446 ; E452T
First year Aug.1932 Wireless World (The), London (WW, 79) p122

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=C) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source L'ABCDaire des lampes de TSF des jeunes années   p. 68b
British Radio Valves - The Classic Years: 1926-1946   Supplement p. 35 (ETA)
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49


Just Qvigstad
Usage in Models 1= 1932 ; 2= 1933

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of

 
dw7_mazda_lmp1.jpg

 

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