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ID = 18408
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Double Diode-Triode   Controlling (mu) 
Identical to HL42DD

Base Octal-8 GB, (Mazda), K8B, MO (Codex=Vg) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Direct
Information source Taschenbuch zum Röhren-Codex 1948/49   
HL42DD: Mazda HL42/DD
Howard Craven

More ...
HL42DD: Telefunken Werkstattbuch
Wolfgang Bauer

HL42DD: Original data sheet
Michael Poll

More ...

from Just Qvigstad

Usage in Models 14= 1939 ; 1= 1946?? ; 1= 1946? ; 4= 1946 ; 2= 1948 ; 1= 1950

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):23

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