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TDD2

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ID = 14871
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to TDD2 = K23A
Similar Tubes
Normally replaceable-slightly different:
  DDT2
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fp)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description

Top Cap Grid. Metallised bulb only (1935). Ra 12,000 ohms, gm 1.4 mA/V.

 
Information source History of the British Radio Valve to 1940   p. 150 & 166
Babani, International Radio Tube Encyclopaedia   p. 146 & 147
Taschenbuch zum Röhren-Codex 1948/49

128_5.png TDD2: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
tdd2.png
TDD2: Mullard Maintenance Manual 1954
Achim Dassow

Usage in Models 1= 1933? ; 1= 1935?? ; 1= 1935? ; 4= 1935

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):7

Collection of

 
tdd2.jpg

 

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