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ID = 13959
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum   Power/Output 
Identical to CV1154 = NR16A = 7405A
Predecessor Tubes NR16   CV1153   PM254  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 3.6 Volts / If 0.23 Ampere / Direct / Battery =
Description Similar to NR16/CV1153, with heater current reduced to 0.23A, gm increased from 0.9 to 1.95mA/V and Rp reduced from 4 to 2.3 kohms. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   

pm3_9.png CV1154: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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