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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. | ||
The 661 project was led by [[Norm Winningstad]]. | |||
Four sampling units were made: | Four sampling units were made: | ||