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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

Base British-7-Pin, old (M7A) (Codex=Nb)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Parallel, (AC/DC)
Description

1933 Mullard data quotes the heater current as 1.2A.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
tdd4_01.jpg
TDD4: Collection TL
Thomas Lebeth

 
154_5.png
TDD4: Telefunken Werkstattbuch
Wolfgang Bauer

 
tdd4_techdat01.png
TDD4: Mullard Valves 1936
Peter Hoddow


from Just Qvigstad

Usage in Models 2= 1933? ; 5= 1933 ; 2= 1934? ; 7= 1934 ; 2= 1935?? ; 3= 1935? ; 4= 1935 ; 2= 1936? ; 35= 1936 ; 1= 1937? ; 35= 1937 ; 2= 1938? ; 26= 1938 ; 11= 1939 ; 1= 9999

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):138


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