7A29: Difference between revisions

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{{Plugin Sidebar
{{Plugin Sidebar
|manufacturer=Tektronix  
|manufacturer=Tektronix  
|series=[[7000-series scopes]]
|series=7000-series scopes
|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  
|discontinued=1991  
|discontinued=1991  
|designers=John Addis
|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]].
Line 23: Line 24:


{{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}}
{{PatentLinks|7A29}}


==Internals==
==Internals==
Line 38: Line 46:


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 [[131-2038-00 | input connector]] is a special Tek-made part that is exactly 50 Ω to SMA.  Typical BNC connectors are around 52 Ω.


The 7A29 does not use the ±50 V supplies provided by the mainframe.
The 7A29 does not use the ±50 V supplies provided by the mainframe.
Line 49: Line 57:
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)
Tek 7a29 with gr-874 1.jpg|7A29 with GR-874 factory mod
Tek 7a29 with gr-874 1.jpg     | 7A29 with GR-874 factory mod
Tek 7a29 bw vs var gain.png|7A29 bandwidth versus variable gain
Tek 7a29 bw vs var gain.png     | 7A29 bandwidth versus variable gain
</gallery>
</gallery>


Line 75: Line 99:
Tek 7a29 right rear.jpg        | 7A29, right side, rear
Tek 7a29 right rear.jpg        | 7A29, right side, rear
Tek 7a29 right front.jpg        | 7A29, right side, front
Tek 7a29 right front.jpg        | 7A29, right side, front
Tek 7a29 with gr-874 2.jpg|7A29 with GR-874 factory mod
Tek 7a29 with gr-874 2.jpg     | 7A29 with GR-874 factory mod
Tek 7a29 with gr-874 3.jpg|7A29 with GR-874 factory mod
Tek 7a29 with gr-874 3.jpg     | 7A29 with GR-874 factory mod
</gallery>
</gallery>


Line 90: Line 114:
</gallery>
</gallery>


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


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

Latest revision as of 03:35, 29 June 2024

Tektronix 7A29
1 GHz amplifier
7A29 front view (sans options)

Compatible with 7000-series scopes

Produced from 1978 to 1991

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

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.

Like with the 7A19, a variable signal delay was available as an option. The 7A29 was designed by John Addis.

There is also a 7A29P, which has digitally programmable gain, intended for the 7000 series digitizers and the 7854 only.

The 7F10 uses the 7A29's amplifier board after the optical/electrical converter.

Key Specifications

Bandwidth 1 GHz (in 7104)
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)
Max. input max. 10 VRMS or 1 Ws pulses not exceeding 50 V; max. 100 V additional DC component in AC mode
Deflection 10 mV/div to 1 V/div, 1-2-5, ±2%; variable 2.5:1
Channels Single channel
Recommended probes P6056 (×10), P6057 (×100)
Options Option 4: variable delay (1 ns)

Links

Documents Referencing 7A29

Document Class Title Authors Year Links
Tekscope 1979 V11 N1.pdf Article 1 GHz at 1 mV in a General Purpose Plug-in Oscilloscope Hans Springer 1979 7104 • Hypcon • SHFIII • 7A29 • 7B10 • 7B15
RISOM2873.pdf Article Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET Erik Kristensen 1990 7912AD • 7A29 • 7704A • 7S12 • S-6 • S-52

Patents that may apply to 7A29

Page Title Inventors Filing date Grant date Links
Patent US 4132958A Feedbeside correction circuit for an amplifier John Addis • Bruce Hofer 1977-10-31 1979-01-02 7104 • 7A29 • 7F10

Internals

The 7A29 employs a number of Tek-made custom Hypcon-packaged hybrids, the 155-0180-00 fast input protection, 155-0181-00 input amplifier and 155-0175-00 trigger amplifier (2 ×). It also uses the 155-0076-00 input protection IC initially developed for the 485.

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 (see Patent US 4132958A).

The input connector is a special Tek-made part that is exactly 50 Ω to SMA. Typical BNC connectors are around 52 Ω.

The 7A29 does not use the ±50 V supplies provided by the mainframe.

Although the 7A29 has a VARIABLE gain control, this control has the undesirable side-effect of also affecting bandwidth. See bandwidth versus VARIABLE gain plot below.

Repair issues

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!

Prices

Year 1980 1985 1990
Catalog price $1,895 (Opt.04 +$350) $2,855 $3,775 (Opt.04 +$535)
In 2023 Dollars $7,100 (Opt.04 +$1,300) $8,100 $8,900 (Opt.04 +1,300)

Pictures

  • 7A29 (no opt.) front

    7A29 (no opt.) front

  • 7A29 Opt.4 front

    7A29 Opt.4 front

  • photo of 7A29 from manual (standard and option 4 units)

    photo of 7A29 from manual (standard and option 4 units)

  • 7A29 with GR-874 factory mod

    7A29 with GR-874 factory mod

  • 7A29 bandwidth versus variable gain

    7A29 bandwidth versus variable gain

Internal

  • 7A29 (no opt.), left side (fixed delay line)

    7A29 (no opt.), left side (fixed delay line)

  • 7A29 Opt.4, left view (variable delay line enclosure above PCB)

    7A29 Opt.4, left view (variable delay line enclosure above PCB)

  • 7A29, right side

    7A29, right side

  • 7A29 input protection relay

    7A29 input protection relay

  • 7A29 input protection relay lever

    7A29 input protection relay lever

  • 7A29 backplane connector (stripline signal path)

    7A29 backplane connector (stripline signal path)

  • 7A29 amplifiers

    7A29 amplifiers

  • 7A29, right side, rear

    7A29, right side, rear

  • 7A29, right side, front

    7A29, right side, front

  • 7A29 with GR-874 factory mod

    7A29 with GR-874 factory mod

  • 7A29 with GR-874 factory mod

    7A29 with GR-874 factory mod

Schematics

  • input amplifier schematic

    input amplifier schematic

  • output amplifier schematic

    output amplifier schematic

Measurements

  • Sample 7A29 rise time measurement (Source: S-52) - 320 ps equiv. 1.09 GHz system bandwidth including 7104 mainframe

    Sample 7A29 rise time measurement (Source: S-52) - 320 ps equiv. 1.09 GHz system bandwidth including 7104 mainframe

Components

Some Parts Used in the 7A29

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 • AM502 • CG5001 • CG551AP • FG501 • FG502 • FG503 • OF150 • OF151 • OF152 • OF235 • OS261 • RM502A • R1140 • R5030 • R5031 • R7912 • 067-0679-00 • 067-0807-00 • 1101 • 1140A • 1141 • 1142 • 1350 • 145 • 1450 • 1480 • 1481 • 1482 • 1485 • 1501 • 1801 • 1900 • 1910 • 1980 • 213 • 26A1 • 26A2 • 2620 • 285 • 3A9 • 3A10 • 3S1 • 3S2 • 3S5 • 3S6 • 432 • 434 • 4501 • 454 • 4601 • 4602 • 4610 • 4612 • 4620 • 4632 • 4634 • 4701 • 475 • 492 • 492A • 492AP • 494 • 494P • 496 • 496P • 5A13N • 5A20N • 5A21N • 5A22N • 5A26 • 5L4N • 502A • 5030 • 5031 • 576 • 690SR • 7A22 • 7A29 • 7B51 • 7B71 • 7J20 • 7L5 • 7S11 • 7S12 • 7912AD
155-0076-00 155-0076-00 Monolithic integrated circuit input protection and probe logic 465 • 485 • 7A29 • 7A29P • 11A52 • 11A71 • 11A72 • SCD1000
155-0175-00 155-0175-00 • 155-0175-05 Monolithic integrated circuit broadband amplifier 7904A • 7912HB • 7934 • 7104 • R7103 • 7A29 • 7A29P • 7F10 • 067-0587-02 • 067-0587-10 • 11A71 • SCD1000 • EG&G N-AM-173A
155-0180-00 155-0180-00 Hybrid integrated circuit fast input protection 7A29 • 7A29P • 7F10 • 11A71
155-0181-00 155-0181-00 Hybrid integrated circuit input amplifier 7A29 • 7A29P • 7F10 • 11A71
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