7A26: Difference between revisions

Revision as of 08:29, 13 August 2021

Tektronix 7A26
200 MHz dual-channel amplifier 7A26 front panel Compatible with 7000-series scopes Produced from 1974 to 1991 Manuals 7A26 Instruction Manual (PDF) 7A26 Instruction Manual Rev. Oct 1982 (PDF, OCR) Tektronix 7A26 Description in German (OCR, PDF) 7A26 Vertical amplifier replacement (PDF) Tektronix 7A26 IC Mod (PDF) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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 resoldering.

Links

Pictures

Front panel
left side
right side
Cartoon in schematic: The 7A26 Sharp Shooter

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar 2 |
+{{Plugin Sidebar
-manufacturer=Tektronix | type=7A26 |
+|manufacturer=Tektronix
-summary=200 MHz dual channel vertical amplifier |
+|series=7000-series scopes
-image=Tek 7a26 front_lc.jpg |
+|type=7A26
-caption=7A26 front panel |
+|summary=200 MHz dual-channel amplifier
-introduced=1974 |
+|image=Tek 7a26 front_lc.jpg
-discontinued=1991 |
+|caption=7A26 front panel
-series=7000-series scopes|
+|introduced=1974
-manuals=
+|discontinued=1991
-* [http://bama.edebris.com/download/tek/7a26/tek-7a26.pdf Tektronix 7A26 Manual (PDF)]
+|designers=Tom Rousseau
-* [http://bama.edebris.com/download/tek/7a26mod/Tek%207A26%20IC%20Mod.pdf Tektronix 7A26 IC Mod (PDF)]
+|manuals=
-* [http://w140.com/smb/7a26_sm.pdf Tektronix 7A26 Manual (OCR, PDF)]
+* [[Media:070-1484-00.pdf|7A26 Instruction Manual]] (PDF)
+* [[Media:070-1484-01.pdf|7A26 Instruction Manual Rev. Oct 1982]] (PDF, OCR)
 * [[Media:Tek 7A26 german user sm.pdf|Tektronix 7A26 Description in German (OCR, PDF)]]
 * [[Media:040-0785-01.pdf|7A26 Vertical amplifier replacement (PDF)]]
-* [[Media:070-1484-00.pdf|7A26 Instruction Manual, part no 070-1484-00 (PDF)]]
+* [http://bama.edebris.com/download/tek/7a26mod/Tek%207A26%20IC%20Mod.pdf Tektronix 7A26 IC Mod (PDF)]
-* [[Media:070-1484-01.pdf|7A26 Instruction Manual, part no 070-1484-01 (OCR, PDF)]]
 }}
 The '''Tektronix 7A26''' is a 200&nbsp;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&nbsp;MHz [[7A18]] and 400&nbsp;MHz [[7A24]] share the same front panel layout and operation.
+The 75 MHz [[7A18]] and 400 MHz [[7A24]] share the same front panel layout and operation.
 {{BeginSpecs}}
@@ Line 31: / Line 31: @@
 Controls layout and internal construction is very similar to the 75&nbsp;MHz [[7A18]].
-Whereas the 7A18 is a discrete design, the 7A26 uses Tek-made differential amplifier ICs
+Whereas the 7A18 is a discrete design, the 7A26 uses Tek-made differential amplifier ICs [[155-0078-00|155-0078-xx]].
-[[155-0078-00|155-0078-xx]].
 The 7A26 does not use the ±50 V supplies provided by the mainframe.