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History of the manufacturer  

Challenge; (where?)

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Name: Challenge; (where?)    (J)  
Abbreviation: challenge
Products: Model types
History:

This manufacturer was suggested by Michael Watterson.


Some models:
Country Year Name 1st Tube Notes
64 R-66 (Japan 712) 2SA71  Also 4 diodes and thermistor. VHF is 86MHz to about 112MHz SW is 49m to 16m approx. L... 

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