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DDT

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ID = 14072
       
Country:
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to DDT = CV2890
Similar Tubes
Normally replaceable-slightly different:
  DDT4160 ; DDT4_Clarion
Heater different:
  DDT16
First Source (s)
1933 : History of the British Radio Valve to 1940 p.179
Base British-7-Pin, old (M7A) (Codex=Nb) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description

Triode Typ gm of 2.4mA/V at Va=200V.

 
Information source Babani, International Radio Tube Encyclopaedia   p. 94 & 95
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 292, p. 656
Taschenbuch zum Röhren-Codex 1948/49
Tube Tester Data Avo CT160
523.png DDT: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		ddt_data.png
DDT: COSSOR VALVE MANUAL 1935-6
Jose Casas-Avalos
Usage in Models 1= 1933 ; 1= 1934 ; 6= 1935? ; 2= 1935 ; 1= 1936? ; 3= 1936 ; 9= 1937 ; 1= 1938? ; 6= 1938 ; 1= 1939? ; 1= 1939 ; 1= 1940? ; 9= 1940 ; 1= 1942 ; 1= 1945 ; 2= 1946 ; 1= 1948?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):47

Collection of

Patrice Zeissloff (F)
Rudolf Osterkamp (D)
Karlheinz Fischer (D)
 
ddt~~1.jpg

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