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 The Tektronix 661 is a [[sampling oscilloscope]] that was made by Tektronix starting in 1961.
 It accepts two plug-ins: a sampling unit and a timing unit.
-At least three sampling units were made,
+Four sampling units were made:
-the [[4S1]] (0.35 ns rise time) and
+the [[4S1]] (0.35 ns rise time),
-the [[4S2]] (0.1 ns rise time), and the [[4S3]].
+the [[4S2|4S2 and 4S2A]] (0.1 ns rise time), and the [[4S3]].
-At least three timing units were made, the [[5T1]], [[5T1A]], and the [[5T3]].
+Three timing units were made, the [[5T1]], [[5T1A]], and the [[5T3]].
 The timing units use [[tunnel diodes|tunnel diode]] triggering.
 Two coaxial cables in the scope connect the sampling unit to the timing unit.