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ID = 14271
Great Britain (UK)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to H610
Similar Tubes
Other class quality (otherwise equal):
Heater different:
Other base:
First Source (s)
1929 : History of the British Radio Valve to 1940 p. 164

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.1 Ampere / Direct / Battery =

High-gain triode for 6V heater supply. Mu 40.Used for resistance coupled amplifying.

Dimensions (WHD)
incl. pins / tip
x 103 x 47 mm / x 4.06 x 1.85 inch
Weight 44 g / 1.55 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   Osram tube booklet March 1930

b4_base_pins~~25.png H610: Fin Stewart
Fin Stewart

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