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|designers=Gene Kauffman; | |designers=Gene Kauffman; | ||
|manuals= | |manuals= | ||
* | * [[Media:070-0598-01.pdf|Tektronix 491 Instruction Manual 070-0598-01]]'' | ||
* [[Media:Tektronix_491_Maintenance_Manual_ARMY.pdf | Tektronix 491 Instruction Manual (US Army TM 9-6625-2467-15)]] | * [[Media:Tektronix_491_Maintenance_Manual_ARMY.pdf | Tektronix 491 Instruction Manual (US Army TM 9-6625-2467-15)]] | ||
* [[Media:Tek_491_Catalog_Spec_1967.pdf | Tektronix 491 Introduction Spec]] (OCR) | * [[Media:Tek_491_Catalog_Spec_1967.pdf | Tektronix 491 Introduction Spec]] (OCR) | ||
* [[Media:Tek_491_Catalog_Spec_1979.pdf | Tektronix 491 Final Spec]] (OCR) | * [[Media:Tek_491_Catalog_Spec_1979.pdf | Tektronix 491 Final Spec]] (OCR) | ||
<small> | <small> | ||
'''Modifications and Calibration''' | '''Modifications and Calibration''' | ||
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[[Category:Spectrum analyzers]] | [[Category:Spectrum analyzers]] | ||