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ID = 12639
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to D4 = REN904
Similar Tubes
Normally replaceable-slightly different:
  4GPAC ; A30D ; ACHL ; CV1037 ; HLA2 ; MH4
Heater different:
First Source (s)
1933 : History of the British Radio Valve to 1940 p. 178

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Eu)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Typ:- Va 200; Ia 4mA; Vg -3.0; Ra 12,500; gm 3.3 mA/V


Known brands are Ferranti and Cossor.

Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
  D4: Ferranti Valves, List Wb. 560
Achim Dassow
D4: Telefunken Werkstattbuch
Wolfgang Bauer

More ...
D4: Ferranti Valves List Wb. 560
Achim Dassow

More ...

from Just Qvigstad

Usage in Models 1= 1932 ; 2= 1933 ; 1= 1935

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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