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|manuals= | |manuals= | ||
* ''[[Media:070-0598-01.pdf|Tektronix 491 Instruction Manual 070-0598-01 needed]]'' | * ''[[Media:070-0598-01.pdf|Tektronix 491 Instruction Manual 070-0598-01 needed]]'' | ||
* [[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 ( | * [[Media:Tek_491_Catalog_Spec_1967.pdf | Tektronix 491 Introduction Spec]] (OCR) | ||
* [[Media:Tek_491_Catalog_Spec_1979.pdf | Tektronix 491 Final Spec ( | * [[Media:Tek_491_Catalog_Spec_1979.pdf | Tektronix 491 Final Spec]] (OCR) | ||
* ''Service manual needed '' | * ''Service manual needed '' | ||
<small> | <small> | ||
'''Modifications and Calibration''' | '''Modifications and Calibration''' | ||
* [[Media:050-0692-03.pdf | Tektronix 491 Band C Oscillator Replacement Modification ( | * [[Media:050-0692-03.pdf | Tektronix 491 Band C Oscillator Replacement Modification]] (OCR) | ||
* [[Media:Tek 491 mod wa.pdf | Tektronix 491 Mod WA ( | * [[Media:Tek 491 mod wa.pdf | Tektronix 491 Mod WA]] (needs OCR)]] | ||
* [[Media:Tek 491 fcp nov 1966.pdf | Tektronix 491 Factory Calibration Procedure, November 1966 ( | * [[Media:Tek 491 fcp nov 1966.pdf | Tektronix 491 Factory Calibration Procedure, November 1966]] (needs OCR) | ||
</small> | </small> | ||
}} | }} |