491

Tektronix 491

The Tektronix 491 is a spectrum analyzer introduced in August 1966.

Due to severe performance limitations, it was replaced by the completely redesigned 492 in 1980.

Manuals

• Tektronix 491 manual @ KO4BB
• Tektronix 491 Band C Oscillator Replacement Modification (PDF, OCR)

Links

• Tektronix 491 @ radiomuseum.org

Pictures

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