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AC/HLDDD

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ID = 31980
       
Country:
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Triple Diode-Triode   Audio Frequency 
Identical to AC/HLDDD
Base B9 British 9-Pin Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip		 45 x 125 x mm / 1.77 x 4.92 x inch
Information source History of the British Radio Valve to 1940   p.148 & 179
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
achldddbase.png AC/HLDDD: own collection
Peter den Boer

Just Qvigstad 		achlddd.png
AC/HLDDD: own collection
Peter den Boer
Usage in Models 1= 1934
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
 
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