7A26: Difference between revisions

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-The Tektronix 7A26 is a 200 MHz dual-trace vertical plug-in for
+{{Plugin Sidebar
-[[7000-series scopes]].  The input impedance is 1 megohm in parallel with 20 pF.
+|manufacturer=Tektronix
-Deflection factors go from 5 mV/div to 5 V/div.
+|series=7000-series scopes
-There is a switch to limit the bandwidth to 20 MHz.
+|type=7A26
+|summary=200 MHz dual-channel amplifier
+|image=Tek 7a26 front.jpg
+|caption=7A26 front panel
+|introduced=1974
+|discontinued=1991
+|designers=Tom Rousseau
+|manuals=
+* [[Media:070-1484-00.pdf|7A26 Instruction Manual -00]]
+* [[Media:070-1484-01.pdf|7A26 Instruction Manual -01 Rev. Oct 1982]] (OCR)
+* [[Media:Tek_7A26_Anleitung_Deutsch.pdf|Tek7A26 Anleitung (Operators Manual, German)]] (OCR)
+* [[Media:040-0785-01.pdf|7A26 Vertical amplifier replacement]] (OCR)
+}}
+The '''Tektronix 7A26''' is a 200 MHz dual-trace vertical plug-in for [[7000-series scopes]].
+Designed by [[Tom Rousseau]], it was the most successful 7000 series plug-in, with over 120,000 units produced.
-* [http://bama.edebris.com/download/tek/7a26/tek-7a26.pdf Tektronix 7A26 Manual (PDF)]
+The 75 MHz [[7A18]] and 400 MHz [[7A24]] share the same front panel layout and operation.
-* [http://bama.edebris.com/download/tek/7a26mod/Tek%207A26%20IC%20Mod.pdf Tektronix 7A26 IC Mod (PDF)]
+{{BeginSpecs}}
+{{Spec | Bandwidth |200 MHz}}
+{{Spec | Deflection | 5 mV/Div – 5 V/Div in 1−2−5 sequence }}
+{{Spec | Input impedance | 1 MΩ // 22 pF }}
+{{Spec | Features | Bandwidth limiting switch (20 MHz) }}
+{{EndSpecs}}
+==Internals==
+Controls layout and internal construction is very similar to the 75 MHz [[7A18]].
+Whereas the 7A18 is a discrete design, the 7A26 uses Tek-made differential amplifier ICs [[155-0078-00|155-0078-xx]].
+The 7A26 does not use the ±50 V supplies provided by the mainframe.
+==Repair issues==
+The pins of the attenuator modules are connected to conductive traces on the ceramic substrate inside by low-temperature soldering, which can go bad.
+Re-seating the module can temporarily restore the internal contact but will usually not fix the problem permanently.
+Repair is possible by opening the click-locked lid and carefully re-soldering (see [[307-1012-00]]).
+==Links==
+* [https://vintagetek.org/100000-7a26-plug-in/ Tom Rousseau's Golden 100,000<sup>th</sup> 7A26]
+* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A26.htm Tek 7A26] @ amplifier.cd
+* [http://www.barrytech.com/tektronix/tek7000/tek7a26.html Tek 7A26] @ barrytech.com
+* [https://www.youtube.com/watch?v=7scgCL_Rl6E Tektronix 7A26 Restoration and Alignment] by Zenwizard Studios @ YouTube
+==Pictures==
+<gallery>
+Tek 7a26 front.jpg    | Front panel
+Tek 7a26 front_lc.jpg | Front panel
+Tek-7a26-left.jpg     | left side
+Tek-7a26-right.jpg    | right side
+a26-cowboy.png       | [[Tektronix Cartoons|Cartoon]] in schematic: [http://www.reprise.com/host/tektronix/humor/cowboy.asp The 7A26 Sharp Shooter]
+</gallery>
+==Components==
+{{Parts|7A26}}
+[[Category:7000 series vertical plugins]]