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ID = 11557
Great Britain (UK)
Brand: Lissen Ltd.; London and Richmond, Surrey
Tube type:  Vacuum Pentode   Power/Output 
Identical to PT225 = AS241
Similar Tubes
Other base:
First year 1929 The Wireless World, London (WW, 79) Tests in January 1 1930 issue

Base Europe 5-Pin (O5A, B5) (Codex=Foo)
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =

Diese Röhre gibt es auch mit 4-Stift- Europasockel (B4).

(Codex falsch erfasst!)

Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1930
PT225: own collection
Peter den Boer

PT225: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

PT225: own collection
Peter den Boer

Usage in Models 4= 1932 ; 1= 1933? ; 4= 1934

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):9

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