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|type=7A29  
|type=7A29  
|summary=1 GHz amplifier  
|summary=1 GHz amplifier  
|image=7a29 front.jpg  
|image=Tek 7A29 front 1.jpg
|caption=7A29 front view (sans options)  
|caption=7A29 front view (sans options)  
|introduced=1978  
|introduced=1978  
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|designers=John Addis;Val Garuts
|designers=John Addis;Val Garuts
|manuals=
|manuals=
* [http://w140.com/smb/7a29_sm.pdf Tektronix 7A29 (OCR, PDF)]
* [[Media:070-2320-00.pdf|7A29 Instruction Manual]] (OCR)  
}}
}}
The '''Tektronix 7A29''' is a 1 GHz single-channel vertical plug-in for [[7000-series scopes]].
The '''Tektronix 7A29''' is a 1 GHz single-channel vertical plug-in for [[7000-series scopes]].
It is primarily intended for the [[7103]] and [[7104]].
It is primarily intended for the [[7103]] and [[7104]].
Like with the [[7A19]], a variable signal delay was available as an option.
Like with the [[7A19]], a variable signal delay was available as an option.
The 7A29 was designed by [[John Addis]].
The 7A29 was designed by [[John Addis]].
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{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth       | 1 GHz (in [[7104]]) }}
{{Spec | Bandwidth         | 1 GHz (in [[7104]]) }}
{{Spec | Input impedance | 50±1 Ω, VSWR <1.2:1 from DC to 1 GHz (10 mV/Div: 1.4:1, Opt.4: 1.5:1) }}
{{Spec | Input impedance   | 50±1 Ω, VSWR <1.2:1 from DC to 1 GHz (10 mV/Div: 1.4:1, Opt.4: 1.5:1) }}
{{Spec | Max. input     | max. 10 V<sub>RMS</sub> or 1 Ws pulses not exceeding 50 V; max. 100 V additional DC component in AC mode }}
{{Spec | Max. input         | max. 10 V<sub>RMS</sub> or 1 Ws pulses not exceeding 50 V; max. 100 V additional DC component in AC mode }}
{{Spec | Deflection     | 10 mV/div to 1 V/div, 1-2-5, ±2%; variable 2.5:1 }}
{{Spec | Deflection         | 10 mV/div to 1 V/div, 1-2-5, ±2%; variable 2.5:1 }}
{{Spec | Channels       | Single channel }}
{{Spec | Channels           | Single channel }}
{{Spec | Recommended probes | [[P6056]] (×10), [[P6057]] (×100) }}
{{Spec | Recommended probes | [[P6056]] (×10), [[P6057]] (×100) }}
{{Spec | Options         | Option 4: variable delay (1 ns) }}
{{Spec | Options           | Option 4: variable delay (1 ns) }}
{{EndSpecs}}
{{EndSpecs}}
==Links==
* [http://www.eevblog.com/forum/testgear/tektronix-7a29-teardown/ Tektronix 7A29 teardown - nice detailed pictures of attenuator internals]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A29.htm Tek 7A29 @ amplifier.cd] including internal pictures
* [https://youtu.be/yyg9qqE3JOk Tek 7A26 Lab Checkin] A special warning about permanent damage @ Zenwizard Studios
{{Documents|Link=7A29}}


==Internals==
==Internals==
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It uses a "feed-beside" scheme implemented with standard low-frequency operational amplifiers to  
It uses a "feed-beside" scheme implemented with standard low-frequency operational amplifiers to  
compensate for low-frequency anomalies in the frequency response that are attributed to transistor heating.
compensate for low-frequency anomalies in the frequency response that are attributed to transistor heating (see [[Patent US 4132958A]]).


The input connector is a special Tek-made part that is exactly 50 Ω.  Typical BNC connectors are around 52 Ω.
The input connector is a special Tek-made part that is exactly 50 Ω.  Typical BNC connectors are around 52 Ω.
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The input attenuator connected to the Volts/Div switch is very delicate. Three plastic levers actuate the ×2, ×10, and ×5 attenuator switches. Small metal rollers are clipped into the plastic levers and ride on cams. The plastic clips did not age well and have become very brittle. Combined with lack of lubrication on the metal rollers this often leads to broken plastic clips and missing rollers. Do not operate a stiff Volts/Div switch and lubricate rollers before use!  
The input attenuator connected to the Volts/Div switch is very delicate. Three plastic levers actuate the ×2, ×10, and ×5 attenuator switches. Small metal rollers are clipped into the plastic levers and ride on cams. The plastic clips did not age well and have become very brittle. Combined with lack of lubrication on the metal rollers this often leads to broken plastic clips and missing rollers. Do not operate a stiff Volts/Div switch and lubricate rollers before use!  


==Links==
==Prices==
 
<!-- http://www.usinflationcalculator.com/ -->
* [http://www.eevblog.com/forum/testgear/tektronix-7a29-teardown/ Tektronix 7A29 teardown - nice detailed pictures of attenuator internals]
{| class="wikitable"
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A29.htm Tek 7A29 @ amplifier.cd] including internal pictures
|-
! Year
! 1980
! 1985
! 1990
|-
! Catalog price
|align=right| $1,895 (Opt.04 +$350)
|align=right| $2,855
|align=right| $3,775 (Opt.04 +$535)
|-
! In 2023 Dollars
|align=right| $7,100 (Opt.04 +$1,300)
|align=right| $8,100
|align=right| $8,900 (Opt.04 +1,300)
|-
|}


==Pictures==
==Pictures==


<gallery>
<gallery>
7a29 front.jpg                 | 7A29 (no opt.) front
Tek 7A29 front 1.jpg           | 7A29 (no opt.) front
Tek 7a29 front.jpg              | 7A29 Opt.4 front
Tek 7a29 front.jpg              | 7A29 Opt.4 front
7a29 manual photo.jpg          | photo of 7A29 from manual (standard and option 4 units)
7a29 manual photo.jpg          | photo of 7A29 from manual (standard and option 4 units)
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</gallery>
</gallery>


{{Custom ICs|7A29}}
==Components==
{{Parts|7A29}}


[[Category:7000 series vertical plugins]]
[[Category:7000 series vertical plugins]]
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