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DDL4

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ID = 6629
       
Country:
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: Cossor, A.C.; London 
Tube type:  Double Diode   Text 
  Ca. 1925 up to 1945 rare.
Identical to DDL4 = VT127A_GPO = CV1691
Similar Tubes
Normally replaceable-slightly different:
  VR119
Other class quality (otherwise equal):
  CV1119
First Source (s)
1937 : History of the British Radio Valve to 1940 p.177
Successor Tubes VR119  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fd)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Indirect / Parallel, (AC/DC)
Description

Twin triode used as a rectifier doubler

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Babani, International Radio Tube Encyclopaedia   Pages 94 & 95
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
 
ddl4.jpg
DDL4: De mi autoria
Cristian Wolkenstein

 
125_9.png
DDL4: Telefunken Werkstattbuch
Wolfgang Bauer

 

from Just Qvigstad

Usage in Models 1= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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