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-The Tektronix Type 82 is a 100MHz dual-trace plug-in for the 585 and 585A oscilloscopes.
+{{Plugin Sidebar
+|manufacturer=Tektronix
+|series=580-series scopes
+|type=82
+|summary=85 MHz dual-trace amplifier
+|image=Tek_82_early_front.jpg
+|caption=Type 82 front view (earlier style)
+|introduced=1962
+|discontinued=1972
+|designers=John Gates;
+|manuals=
+* [[Media:070-349.pdf|Tektronix Type 82 Manual]]
+}}
+The '''Tektronix Type 82''' is a dual-trace plug-in for the [[580-series scopes]].
+The Type 82 combined with a [[585]] or 585A provides a 4 nanosecond risetime (85 MHz bandwidth).
+{{BeginSpecs}}
+{{Spec | Rise time  | 4 ns in ×1 mode, 4.3 ns in ×10 mode (in [[585]] mainframe)  }}
+{{Spec | Bandwidth  | 85 MHz in ×1 mode, 80 MHz in ×10 mode (in [[585]] mainframe); 70 MHz/66 MHz, respectively, with [[P6008]] probe }}
+{{Spec | Deflection | 50 V/Div to 100 mV/Div in ×1 mode, 5 V/Div to 10 mV/Div in ×10 mode (1-2-5) }}
+{{EndSpecs}}
+==Internals==
+The front end of the Type 82 has three versions, depending on serial number range.
+In all versions, the signal path starts with a [[7586]] [[nuvistor]] cathode-follower, followed by bipolar diff-amps
+and diode channel switching, followed by a [[distributed amplifier|distributed output amplifier]] made
+of three [[6DJ8]] tubes, with differential 93 Ω outputs.
+The use of a distributed amplifier in a plug-in is unusual.
+Note that the 58x series differs from [[500-series scopes]] mainly in that the vertical
+signal [[580 Series plug-in interface|interface between the plug-in and the mainframe]]
+is a low controlled impedance (93 ohms), as opposed to other 500-series scopes
+that present a high impedance to the plug-in.
+[[Stan Griffiths]] wrote:
+<blockquote>
+If you feed [a fast risetime] signal into an early type 82, you will
+find that the top three least sensitive positions have really terrible frequency
+response ... so bad, in fact, that some customers thought they were broken.
+When told this was normal, these customers wondered why Tek ever included them
+on the plugin. The answer was that they were still useful for low frequency
+signals ... but Tek never really made it well known that these 82 attenuator
+positions were lousy. I think this was fixed on the later 82's as Tek learned
+how to make better attenuators. If you have an early 82 and need to look at
+high frequency signals on the less sensitive ranges, the answer is to get ×100
+probes and use them on the more sensitive ranges where the frequency response is
+better.
+</blockquote>
+The [[P6008]] voltage probe was designed for use with the Type 82.
+The [[585]] manual warns that for proper performance with the 82 and higher-numbered plug-ins, 585 non-A scopes with serial numbers before 2585 should have the back termination of the final distributed amplifier output modified to the later circuit (modification 040-275).
+==Prices==
+{| class="wikitable"
+|-
+! Year
+! 1965
+! 1969
+! 1971*
+! 1972*
+|-
+! Type 82
+|align=right|   $650
+|align=right|   $695
+|align=right|   $925
+|align=right| $1,000
+|-
+! In 2023 Dollars
+|align=right|  $6,300
+|align=right|  $5,800
+|align=right|  $6,900
+|align=right|  $7,400
+|}
+: ''* "Limited demand" instrument
+==Pictures==
 <gallery>
-Image:82_front.jpg|Front view.
+Tek_82_early_front.jpg     | Front view, early style
-Image:82_left.jpg|Left view.
+Tek 82 1d.JPG              | Front view, later style
-Image:82_top.jpg|Top view.
+Tek-585-82.jpg             | Early type 82 in [[585]] mainframe
-Image:82_right.jpg|Right view.
+Tek-82-left.jpg            | Left side
+Tek-82-right.jpg           | Right side
+Tek82-input-1.jpg          | Detail of input section
+Tek82-input-2.jpg          | Detail of input section
+_front.jpg               | Front view, early style
+_left.jpg                | Left view
+_top.jpg                 | Top view
+_right.jpg               | Right view
+Type 82 top.jpg
+Type 82 rear.jpg
+Type 82 leftb.jpg
+Type 82 bottom.jpg
+Type 82 distamp bottom.jpg | Bottom of distributed amplifier
+Type 82 distamp top.jpg    | Top of distributed amplifier
+Type 82 front.jpg
+Tek 82 late input schematic.png|Input schematic for late serial numbers
+Tek 82 x10 amplifiers schematic.png|x10 amplifiers schematic
+Tek 82 switching and output schematic.png|Switching and output schematic
 </gallery>
+==Components==
+{{Parts|82}}
+[[Category:580 series plugins]]