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* [[Media:050-0692-03.pdf|Tektronix 491 Band C Oscillator Replacement Modification (PDF, OCR)]] | * [[Media:050-0692-03.pdf|Tektronix 491 Band C Oscillator Replacement Modification (PDF, OCR)]] | ||
* [[Media:Tek 491 mod wa.pdf|Tektronix 491 Mod WA (PDF, needs OCR)]] | * [[Media:Tek 491 mod wa.pdf|Tektronix 491 Mod WA (PDF, needs OCR)]] | ||
* [[Media:Tek 491 fcp nov 1966.pdf]] | * [[Media:Tek 491 fcp nov 1966.pdf | Tektronix 491 Factory Calibration Procedure, November 1966 (PDF, needs OCR)]] | ||
==Links== | ==Links== | ||