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No change in size ,  4 June 2023
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The '''Tektronix 661''' is a [[sampling oscilloscope]] that was [[introduced in 1961]].   
The '''Tektronix 661''' is a [[sampling oscilloscope]] that was [[introduced in 1961]].   
It accepts two plug-ins, a sampling unit and a timing unit.
It accepts two plug-ins, a sampling unit and a timing unit.
{{MissingSpecs}}


==History==
==History==
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The Tektronix [[012-064]] is a plug-in extension cable for the 661.
The Tektronix [[012-064]] is a plug-in extension cable for the 661.
{{MissingSpecs}}


== Mechanical ==
== Mechanical ==