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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]]. | The 561 is the most common of the [[560-series scopes]]. | ||
There is | There is an RM561, [[introduced in 1961]], | ||
the rackmount version of the 561. | the rackmount version of the 561. The 561A was [[introduced in 1962]]. | ||
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. |