3A1S: Difference between revisions

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-The Tektronix 3A1S is a vertical plug-in for the [[561#561S|561S]].
+{{Plugin Sidebar
-It is specified to have an input impedance of 47pF in parallel with 1 megohm.
+|manufacturer=Tektronix
-Input sensitivity in a 561S is from 10mV/div to 10V/div.
+|series=561S
-Risetime is specified to be 14ns, giving a -3dB frequency of 25MHz.
+|type=3A1S
-The input signal passes through a compensated attenuator switch and
+|summary=25 MHz vertical sampling amplifier plug-in
-then into a [[7586]] cathode-follower biased with 2mA plate current.
+|image=Tek 3a1s.jpg
+|caption=Tektronix 3A1S
+|introduced=1961
+|discontinued=(?)
+|manuals=
+* [[Media:070-417.pdf|Tektronix 561S/3A1S/3B1S Manual 070-417]]
+}}
+The '''Tektronix 3A1S''' is a Vertical Sampling Amplifier Plug-in for the [[561#561S|561S]].
+It does not work in other 560-series mainframes.
+{{BeginSpecs}}
+{{Spec | Deflection      | from 10 mV/Div to 10 V/Div (in a 561S)  }}
+{{Spec | Bandwidth       | 25 MHz }}
+{{Spec | Rise time       | 14 ns }}
+{{Spec | Input impedance | 1 MΩ // 47 pF }}
+{{EndSpecs}}
+==Internals==
+The input signal passes through a compensated attenuator switch and then into a [[7586]] cathode-follower biased with 2 mA plate current.
+The gain stages use a mix of transistors and  output stage driving the deflection plates is a transistor/pentode cascode circuit with T-coil loading.
+The 3A1S is built in traditional ceramic-strip construction.
+==Pictures==
 <gallery>
-File:Tek-561s vert1.png
+Tek 3a1s.jpg
-File:Tek-561s vert2.png
+Tek 3a1s left.jpg
+Tek 3a1s right.jpg
+Tek-561s vert1.png|3A1S input amplifier and switching
+Tek-561s vert2.png|3A1S output amplifier
 </gallery>
+==Components==
+{{Parts|3A1S}}
+[[Category:560 series plugins]]