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* [[Media:070-1573-01.pdf|Tektronix 221 Manual (PDF, OCR, bad-OCR)]] | * [[Media:070-1573-01.pdf|Tektronix 221 Manual (PDF, OCR, bad-OCR)]] | ||
* [[Media:061-1817-00.pdf|Mod 290A Single Sweep Modification Insert (PDF)]] | |||
}} | }} | ||
The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | The '''Tektronix Type 221''' is a miniature 5 MHz analog scope [[introduced in 1973]]. | ||