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AC/DDT

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ID = 13725
       
Country:
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Developer: Hivac Ltd.; Harrow-on-the-Hill 
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to AC/DDT
First Source (s)
1934 : History of the British Radio Valve to 1940 p. 179

Base British-7-Pin, old (M7A)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source Wireless World (The), London (WW, 79)   Data book


Just Qvigstad
Usage in Models 1= 1939

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

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