rgn2004 Telefunken Germany tube rectifier black mesh Wehrmacht year 1938 WW2 amp

one tube rgn2004 Telefunken tube rectifier black mesh globe balloon

oldest production 

tested strong on tube tester Funke W19S = 150mA & 145mA (reference good at 70mA & 70mA) 

accepted by Wehrmacht week 20 year 1938

military specifications Wa.A589 as per original print on glass

Socket is a rare P8A 

the rarest version very hard to find 

silver foil getter bottom 

one tube = 1 piece = one valve 

box 164