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one [[2-series or 3-series horizontal plug-ins|2-series or 3-series horizontal plug-in]]. | one [[2-series or 3-series horizontal plug-ins|2-series or 3-series horizontal plug-in]]. | ||
The plug-ins directly drive the horizontal and vertical deflection plates of the CRT. | The plug-ins directly drive the horizontal and vertical deflection plates of the CRT. | ||
The 561 is the most common of the [[560-series scopes]]. There is also an RM561, the | The 561 is the most common of the [[560-series scopes]]. | ||
rackmount version of the 561. | There is also an RM561, [[introduced in 1961]], | ||
the rackmount version of the 561. | |||
There is also a 561S, which is used with special plug-ins such as the 3A1S and 3B1S. | There is also a 561S, which is used with special plug-ins such as the 3A1S and 3B1S. |