7A26: Difference between revisions
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|designers=Tom Rousseau | |designers=Tom Rousseau | ||
|manuals= | |manuals= | ||
* [[Media:070-1484-00.pdf|7A26 Instruction Manual]] | * [[Media:070-1484-00.pdf|7A26 Instruction Manual -00]] | ||
* [[Media:070-1484-01.pdf|7A26 Instruction Manual Rev. Oct 1982]] ( | * [[Media:070-1484-01.pdf|7A26 Instruction Manual -01 Rev. Oct 1982]] (OCR) | ||
* [[Media: | * [[Media:Tek_7A26_Anleitung_Deutsch.pdf|Tek7A26 Anleitung (Operators Manual, German)]] (OCR) | ||
* [[Media:040-0785-01.pdf|7A26 Vertical amplifier replacement | * [[Media:040-0785-01.pdf|7A26 Vertical amplifier replacement]] | ||
* [http://bama.edebris.com/download/tek/7a26mod/Tek%207A26%20IC%20Mod.pdf Tektronix 7A26 IC Mod | * [http://bama.edebris.com/download/tek/7a26mod/Tek%207A26%20IC%20Mod.pdf Tektronix 7A26 IC Mod] @ BAMA | ||
}} | }} | ||
The '''Tektronix 7A26''' is a | 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. | Designed by [[Tom Rousseau]], it was the most successful 7000 series plug-in, with over 120,000 units produced. | ||
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{{Spec | Bandwidth |200 MHz}} | {{Spec | Bandwidth |200 MHz}} | ||
{{Spec | Input impedance | 1 MΩ // 22 pF }} | {{Spec | Input impedance | 1 MΩ // 22 pF }} | ||
{{Spec | Deflection factor | 5 mV/Div – 5 V/Div in | {{Spec | Deflection factor | 5 mV/Div – 5 V/Div in 1−2−5 sequence }} | ||
{{Spec | Features | Bandwidth limiting switch (20 MHz) }} | {{Spec | Features | Bandwidth limiting switch (20 MHz) }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
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==Internals== | ==Internals== | ||
Controls layout and internal construction is very similar to the | 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]]. | Whereas the 7A18 is a discrete design, the 7A26 uses Tek-made differential amplifier ICs [[155-0078-00|155-0078-xx]]. | ||
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The pins of the attenuator modules are connected to conductive traces on the ceramic substrate inside by low-temperature soldering, which can go bad. | 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. | 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 | Repair is possible by opening the click-locked lid and carefully re-soldering. | ||
==Links== | ==Links== | ||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A26.htm Tek 7A26 @ amplifier.cd | * [https://vintagetek.org/100000-7a26-plug-in/ Tom Rousseau's Golden 100,000<sup>th</sup> 7A26] | ||
* [http://www.barrytech.com/tektronix/tek7000/tek7a26.html Tek 7A26 @ barrytech.com | * [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 | * [https://www.youtube.com/watch?v=7scgCL_Rl6E Tektronix 7A26 Restoration and Alignment] by Zenwizard Studios @ YouTube | ||
==Pictures== | ==Pictures== | ||
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<gallery> | <gallery> | ||
Tek 7a26 front_lc.jpg | Front panel | Tek 7a26 front_lc.jpg | Front panel | ||
Tek-7a26-left.jpg | left side | Tek-7a26-left.jpg | left side | ||
Tek-7a26-right.jpg | right side | Tek-7a26-right.jpg | right side | ||
7a26-cowboy.png | 7a26-cowboy.png | [[Tektronix Cartoons|Cartoon]] in schematic: [http://www.reprise.com/host/tektronix/humor/cowboy.asp The 7A26 Sharp Shooter] | ||
</gallery> | </gallery> | ||
Revision as of 00:57, 14 December 2021
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.
The 75 MHz 7A18 and 400 MHz 7A24 share the same front panel layout and operation.
Key Specifications
| Bandwidth | 200 MHz |
|---|---|
| Input impedance | 1 MΩ // 22 pF |
| Deflection factor | 5 mV/Div – 5 V/Div in 1−2−5 sequence |
| Features | Bandwidth limiting switch (20 MHz) |
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-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.
Links
- Tom Rousseau's Golden 100,000th 7A26
- Tek 7A26 @ amplifier.cd
- Tek 7A26 @ barrytech.com
- Tektronix 7A26 Restoration and Alignment by Zenwizard Studios @ YouTube
Pictures
-
Front panel
-
left side
-
right side
-
Cartoon in schematic: The 7A26 Sharp Shooter
Custom ICs used in the 7A26
| Page | Model | Part nos | Description | Designers | Used in |
|---|---|---|---|---|---|
| 155-0078-00 | M084 | 155-0078-xx • 155-0273-00 • 155-0274-00 | broadband amplifier | John Addis | 464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010 |