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ACDDT

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ID = 83991
       
Country:
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to ACDDT = MHD4

Base British-7-Pin, old (M7A) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Indirect
Information source History of the British Radio Valve to 1940   p. 139 & 179
Wireless World (The), London (WW, 79)   November 22, 1935
Babani, International Radio Tube Encyclopaedia
Universal Vade-Mecum, Electron Valves and Semiconductor Devices


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