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ID = 13735
Great Britain (UK)
Brand: Amplion, Alfred Graham & Co. (Algraphone); London
Developer: Mazda = Valve (Tube) brand GB (see also France) 
Tube type:  Triode, vacuum 
Identical to ACHL
Similar Tubes
Normally replaceable-slightly different:
  41MHF ; 4GPAC ; A30D ; D4 ; HLA2 ; MH4
Heater different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Tube prices 1 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
ACHL: gerd.eisenbarth
Gerhard Eisenbarth

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ACHL: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

ACHL: gerd.eisenbarth
Gerhard Eisenbarth

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from Just Qvigstad

Usage in Models 1= 1930 ; 1= 1932

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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