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ID = 18427
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Triode, vacuum   Power/Output 
Identical to DC/HL
First year 07.Jan.1931 The Wireless World, London (WW, 79) Announcement p5
First Source (s)
May.1931 : The Wireless World, London (WW, 79) p iii
Successor Tubes DC3HL  

Base Europe 5-Pin (O5A, B5)
Filament Vf 6 Volts / If 0.5 Ampere / Indirect / Series, DC
Description First British tube series for dc mains use.

Initial announcement quotes the heater voltage at 4.

Ra 13 k ohms, gm 2.7 mA/V 

Literature Taschenbuch zum Röhren-Codex 1948/49   

Usage in Models 1= 1930

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

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