7A26: Difference between revisions
No edit summary |
No edit summary |
||
| (One intermediate revision by the same user not shown) | |||
| Line 4: | Line 4: | ||
|type=7A26 | |type=7A26 | ||
|summary=200 MHz dual-channel amplifier | |summary=200 MHz dual-channel amplifier | ||
|image=Tek 7a26 | |image=Tek 7a26 front.jpg | ||
|caption=7A26 front panel | |caption=7A26 front panel | ||
|introduced=1974 | |introduced=1974 | ||
| Line 49: | Line 49: | ||
<gallery> | <gallery> | ||
Tek 7a26 front.jpg | Front panel | |||
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 | ||
| Line 56: | Line 57: | ||
==Components== | ==Components== | ||
{{ | {{Parts|7A26}} | ||
[[Category:7000 series vertical plugins]] | [[Category:7000 series vertical plugins]] | ||
Latest revision as of 09:07, 2 March 2024
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 |
|---|---|
| Deflection | 5 mV/Div – 5 V/Div in 1−2−5 sequence |
| Input impedance | 1 MΩ // 22 pF |
| 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 (see 307-1012-00).
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
-
Front panel
-
left side
-
right side
-
Cartoon in schematic: The 7A26 Sharp Shooter
Components
Some Parts Used in the 7A26
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 151-1032-00 | 151-1032-00 | Discrete component | dual n-channel JFET (selected) | 7A15A • 7A26 |
| 155-0078-00 | 155-0078-xx • 155-0273-00 • 155-0274-00 | Monolithic integrated circuit | broadband amplifier | 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 |
| 307-1012-00 | 307-1012-00 | Discrete component | thick-film 5x attenuator | 7A26 |