radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

TDD4

Information - Help 
ID = 14872
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to TDD4 = DT41 = DDT4 = A23A
Similar Tubes
Normally replaceable-slightly different:
  ACHL4DD
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)
Base British-7-Pin, old (M7A) (Codex=Nb)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Specified voltage AC/DC
Description

1933 Mullard data quotes the heater current as 1.2A.

 
Information source History of the British Radio Valve to 1940   p. 150 & 179
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
154_5.png TDD4: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		tdd4_techdat01.png
TDD4: Mullard Valves 1936
Peter Hoddow
Usage in Models 2= 1933? ; 5= 1933 ; 2= 1934? ; 7= 1934 ; 2= 1935?? ; 3= 1935? ; 4= 1935 ; 2= 1936? ; 35= 1936 ; 4= 1937? ; 35= 1937 ; 2= 1938? ; 27= 1938 ; 11= 1939
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):141

Collection of

Frank Cuffe (IRL)
Thomas Lebeth (A)
Howard Craven (GB)
Pedro Prieto-Castro (E)
Ralf Plaga (D)
 
tdd4_01.jpg

TDD4
 
You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
Data Compliance More Information