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designers=Tom Rousseau| | designers=Tom Rousseau| | ||
manuals= | manuals= | ||
* [[Media:070-1126-01.pdf|Tektronix 7A18+7A18N Instruction Manual]] (OCR | * [[Media:070-1126-01.pdf|Tektronix 7A18+7A18N Instruction Manual]] (OCR) | ||
* [[Media:070-4329-00.pdf|Tektronix 7A18A Instruction Manual]] (OCR | * [[Media:070-4329-00.pdf|Tektronix 7A18A Instruction Manual]] (OCR) | ||
* [http://bama.edebris.com/download/tek/7a18/Tektronix_7A18_Service_June1974.pdf Tektronix 7A18 Manual | <small> | ||
* [http://bama.edebris.com/download/tek/7a18a/tek-7a18a.pdf Tektronix 7A18A Manual | '''Alternates''' | ||
* [http://bama.edebris.com/download/tek/7a18/Tektronix_7A18_Service_June1974.pdf Tektronix 7A18 Manual] @ BAMA | |||
* [http://bama.edebris.com/download/tek/7a18a/tek-7a18a.pdf Tektronix 7A18A Manual] @ BAMA | |||
</small> | |||
}} | }} | ||
The '''Tektronix 7A18''' is a general-purpose | The '''Tektronix 7A18''' is a general-purpose 75 MHz dual-trace vertical plug-in for [[7000-series scopes]]. | ||
Model 7A18N is identical except it omits the [[7000 series readout system|readout circuits]]. | |||
Option 06 (first offered in 1975 catalog) adds offset voltage controls giving ±200 Div offset range. This option replaces the IDENTIFY buttons with DC offset controls and adds a fourth "DC offset" position to the input coupling switch. | Option 06 (first offered in 1975 catalog) adds offset voltage controls giving ±200 Div offset range. | ||
This option replaces the IDENTIFY buttons with DC offset controls, and adds a fourth "DC offset" position to the input coupling switch. | |||
The '''7A18A''' is mostly identical to the 7A18 predecessor, but replaces the custom low inductance potentiometers for gain and variable gain setting with a FET attenuator and regular potentiometers. | |||
The 7A18(A) uses a discrete front-end followed by [[M036|M36]] channel switch ICs for the vertical and trigger signals. | |||
The 200 MHz [[7A26]] and 400 MHz [[7A24]] share the same front panel layout and operation. | The 200 MHz [[7A26]] and 400 MHz [[7A24]] share the same front panel layout and operation. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
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* [https://www.youtube.com/watch?v=JZ76egcWH_4 Tektronix 7A18 II Repair and Alignment (With a Deeper Look at the High Frequency Compensation)] @ Zenwizard Studios YouTube | * [https://www.youtube.com/watch?v=JZ76egcWH_4 Tektronix 7A18 II Repair and Alignment (With a Deeper Look at the High Frequency Compensation)] @ Zenwizard Studios YouTube | ||
* [https://youtu.be/Cz9kxXKlWUw Tektronix 7A18 Repair and Function Generator Alignment] @ Zenwizard Studios YouTube | * [https://youtu.be/Cz9kxXKlWUw Tektronix 7A18 Repair and Function Generator Alignment] @ Zenwizard Studios YouTube | ||
{{Documents|Link=7A18}} | |||
{{PatentLinks|7A18}} | |||
==Prices== | ==Prices== | ||
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! 1990 | ! 1990 | ||
|- | |- | ||
! Catalog | ! Catalog Price | ||
|align=right| $535 | |align=right| $535 | ||
|align=right| $615 | |align=right| $615 | ||
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|align=right| $1,790 | |align=right| $1,790 | ||
|- | |- | ||
! | ! In 2023 Dollars | ||
|align=right| $ | |align=right| $4,100 | ||
|align=right| $ | |align=right| $3,300 | ||
|align=right| $ | |align=right| $3,400 | ||
|align=right| $3, | |align=right| $3,700 | ||
|align=right| $ | |align=right| $4,200 | ||
|- | |- | ||
|} | |} | ||
== | ==Pictures== | ||
<gallery> | |||
Tek_7a18.jpg | 7A18 Front | |||
7a18-attenuator.jpg | 7A18 attenuator opened. One of the attenuation R/C modules has been unplugged to reveal the switch contacts. | |||
Tek 7A18 attenuator bottom.jpg | 7A18 attenuator, bottom (switch) side | |||
Tek-7603-front.jpg | A [[7603]] with two 7A18s | |||
Tek 7a17 7a18 7b50a model3 cart.jpg | 7A18 in [[7613]] mainframe | |||
7A18 and 7A18N from 070-1126-01.png | 7A18 and 7A18N from service manual 070-1126-01 | |||
Tek 7a18n.jpeg | 7A18N with "Identify" seen on an auction site - probably cobbled parts | |||
7A18N front.jpg | 7A18N Front | |||
7A18N RHS.jpg | 7A18N RHS switch cover removed | |||
7A18N LHS.jpg | 7A18N LHS switch cover removed | |||
7A18 R237A and B broken bond.jpg | Broken bond between ganged gain pots | |||
7A18N split ganged gain epoxy bond split zoom.png | Broken bond between ganged gain pots zoomed | |||
7A18 intact epoxy bond between ganged gain pots.jpg | Intact epoxy between ganged gain pots | |||
</gallery> | |||
===Development Prototypes=== | |||
<gallery> | |||
Tek 7a18 first prototype 1.jpg | First prototype of 7A18 | |||
Tek 7a18 first prototype 2.jpg | First prototype of 7A18 | |||
Tek 7a18 second prototype 1.jpg | Second prototype of 7A18 | |||
Tek 7a18 second prototype 2.jpg | Second prototype of 7A18 | |||
Third prototype of 7a18 1.jpg | Third prototype of 7A18 | |||
Third prototype of 7a18 2.jpg | Third prototype of 7A18 | |||
Third prototype of 7a18 3.jpg | Third prototype of 7A18 | |||
</gallery> | |||
== | ===7A18A=== | ||
<gallery> | <gallery> | ||
Tek-7a18a-front.jpg | 7A18A Front | Tek-7a18a-front.jpg | 7A18A Front | ||
7a18a-left.jpg | 7A18A left side. The step attenuators can be seen on the left, the amplifier board on the right. | 7a18a-left.jpg | 7A18A left side. The step attenuators can be seen on the left, the amplifier board on the right. | ||
7a18a-right.jpg | 7A18A right side. The circuit boards on top carry the readout circuitry. | 7a18a-right.jpg | 7A18A right side. The circuit boards on top carry the readout circuitry. | ||
</gallery> | </gallery> | ||
'''Option 06''' | |||
<gallery> | <gallery> | ||
Tek-7a18a-opt06-front.jpg | 7A18A Opt.06 Front. AC/GND/DC switches have an extra rightmost "DC Offset" position enabling the offset controls. | Tek-7a18a-opt06-front.jpg | 7A18A Opt.06 Front. AC/GND/DC switches have an extra rightmost "DC Offset" position enabling the offset controls. | ||
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</gallery> | </gallery> | ||
==Components== | |||
{{Parts|7A18}} | |||
{{Parts|7A18A}} | |||
{{ | |||
[[Category:7000 series vertical plugins]] | [[Category:7000 series vertical plugins]] |