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ID = 28819
Tube type:  Triode, vacuum   Universal 
Identical to TP4_Vatea
First year 1927 Saga of the Vacuum Tube, Tyne page 467
First Source (s)
1925 : -- Original-techn. papers.

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 1.8 Volts / If 0.18 Ampere / Direct / Battery =
TP4_Vatea: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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