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ID = 4206
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes 
Identical to 2C21/1642 = 2C21 = 1642

Description No tube designation or type, only a combination of 2C21 and 1642 
Text in other languages (may differ)
Information source Essential Characteristics, GE 1973   

2C21/1642: Manufacturer's Literature
Emilio Ciardiello

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