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ID = 4201
Tube type:  Damper, booster, flyback diode 
Identical to 2BJ2

Base Noval, 9 pin miniature (USA pico-9) B9A Top contact with a cap.
Filament Vf 2.3 Volts / If 0.3 Ampere / Half indirect
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
2BJ2: Walter Lidschreiber
Walter Lidschreiber

2BJ2: RCA Reference Book 1968
Michael Schlör

2BJ2: RCA Manual RC-26
Heinz Höger

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