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The Tektronix 491 is a spectrum analyzer [[introduced in 1966|introduced in August 1966]]. | [[Image:Tek 491.jpg|thumb|300px|right|Tektronix 491]] | ||
The '''Tektronix 491''' is a spectrum analyzer [[introduced in 1966|introduced in August 1966]]. | |||
Due to severe performance limitations, it was replaced by the completely redesigned [[492]]. | Due to severe performance limitations, it was replaced by the completely redesigned [[492]]. |