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ID = 28719
Tube type:  Triode, vacuum   Universal 
Identical to R_Penton = R_England = TM
First year 1924 ?? Saga of the Vacuumtube, Tyne page 393

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If 0.6 Ampere
Description Hersteller: Penton Engineering Co., Great Britain 
Literature -- Collector info (Sammler)   
Saga of the Vacuumtube, Tyne   
R_Penton: KoBi
Konrad Birkner † 12.08.2014

R_Penton: Telefunken Werkstattbuch
Wolfgang Bauer


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