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ID = 20068
Great Britain (UK)
Brand: Lissen Ltd.; London and Richmond, Surrey
Tube type:  Vacuum Pentode   Power/Output 
Identical to PT225_4pin
Similar Tubes
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =

Pa <1.5W, Va=Vg2 <150V

Typ Ia=8mA, Ig2=2, Vg1=-6, Rload=18.7k, Pout=400mW.

Text in other languages (may differ)
Information source Wireless World (The), London (WW, 79)   Nov 1934
- - Manufacturers Literature   1930
PT225_4pin: Frank Cuffe
Frank Cuffe

PT225_4pin: own collection
Peter den Boer

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