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ID = 50731
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Common type Europe tube/semicond. 
Tube type:  Double Diode 
  Ca. 1925 up to 1945 rare.
Identical to RAB2 = AB2

Base Europe side contact, small P5 (Au V, 5E)
Filament Vf 4 Volts / If 0.65 Ampere / Indirect / Parallel, (AC/DC defined voltage)
Information source - - Manufacturers Literature   1-11-1937
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RAB2: RTT 1974 Franzis
Anonymous 61 Collector


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