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ID = 37451
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Double Triode 
Identical to CK6021 = 6021
Similar Tubes
Multiple differences or of other kind:
Predecessor Tubes 5670  

Base Subminiatur-8, with space 1/8, B8D
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect
Description Medim mu twin triode; ruggedized 6BF7 with Gm raised to 5.4mS. 
Information source - - Manufacturers Literature   
Tube Lore (I)   
CK6021: my own tube
Branislav Stojkovic

CK6021: Raytheon Manual
Heinz Höger

CK6021: Raytheon Manual
Heinz Höger

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