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* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)] | * [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)] | ||
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]}} | * [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]}} | ||
The 561 is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and | The '''Tektronix 561''' is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and | ||
produced in various versions well into the 1970's. | produced in various versions well into the 1970's. | ||