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The Tektronix Type 51 is a sweep plug-in for [[560-series scopes]].  
The Tektronix Type 51 is a sweep plug-in for [[560-series scopes]].  
It was [[introduced in 1961]]/
It was [[introduced in 1961]].
It provides a calibrated sweep speed of 5ms/div, and a continuously
It provides a calibrated sweep speed of 5ms/div, and a continuously
variable magnifier that allows the sweep to be set within the range of
variable magnifier that allows the sweep to be set within the range of