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ID = 15584
Great Britain (UK)
Brand: Lissen Ltd.; London and Richmond, Surrey
Tube type:  Double Triode   Power/Output 
Identical to BB240
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base British-7-Pin, old (M7A) (Codex=No)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.4 Ampere / Direct / Battery =

For class B operation with an LP2 driver and 1:1 turns ratio.
Achieves 3.2W audio output with Va=150, Vg=0 and 7,500 ohm Anode to Anode load.

Information source History of the British Radio Valve to 1940   p. 146
Wireless World (The), London (WW, 79)   Data book 1933
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49

s_410_g_3.gif BB240: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

Just Qvigstad
BB240: own collection
Peter den Boer


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