1A1: Difference between revisions

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The Type 1A1 plug-in has two channels and a -3dB point of 50MHz at 50mV/div, 28MHz at 5mV/div,
{{Plugin Sidebar
and 2Hz to 15MHz at 500uV/div when channels 1 and 2 are cascaded.
|manufacturer=Tektronix
Early production used a Nuvistor front-end, and [[rotary_input_switch|rotary input switches]] that were concentric
|series=500-series scopes
with the [[Connectors#BNC|BNC]] jacks, while later units have FETs and lever switches. Type 1A1 uses the "ALT SWEEP SLAVE PULSE" signal
|type=1A1
that is sent by scopes on pin 7 of the plug-in connector.  In a Type [[547]] mainframe, this signal allows channel 1 to be
|summary=50 MHz dual channel amplifier
displayed using the "A" timebase and channel 2 using the "B" timebase.
|image=Tek 1A1 front.jpg
This is useful, for example, to view the IF and AF of a radio receiver at the same time.
|caption=1A1 front view
|introduced=1964
|discontinued=1975
|designers=Ron Olson
|manuals=
* [[Media:070-378.pdf|Tektronix 1A1 Manual (early)]] (bad-OCR)
* [[Media:070-0885-00.pdf|Tektronix 1A1 Manual (late)]] (bad-OCR)
* [[Media:tek_1a1_field_cal_proc.pdf|Tektronix 1A1 Field Recalibration Procedure]] (OCR)
* [[Media:tek_1a1_sn20000up_german_short_version.pdf|Tektronix 1A1 Manual SN20000-up German Short Version]] (bad-OCR)
* [[Media:Tek type 1a1 cal outline.pdf|Tektronix 1A1 Calibration Outline]] (OCR)
* [[Media:Tek 1A1 FET mod.pdf|Modification to replace nuvistors with FETs]]


Types 1A1 and [[1A2]] were [[introduced in 1964|introduced together in 1964]], the former for high-end use,
<!--
the latter as an upgrade/replacement for Type [[CA]].  Both remained available until
* [https://w140.com/mmm/tek-1a1-early.pdf Tektronix 1A1 Manual (early)]
the classic plug-in scope line was discontinued after 1974.
* [https://w140.com/mmm/tek-1a1-late.pdf Tektronix 1A1 Manual (late)]
* [http://w140.com/tek_fcp/tek_type_1a1_factory_cal_proc.pdf Tektronix 1A1 Field Recalibration Procedure]
* [https://w140.com/Tektronix_1A1_SN20000up_german_short_version_300dpi.pdf Tektronix 1A1 Manual SN20000-up German Short Version]
-->
}}
The '''Tektronix Type 1A1''' plug-in for the [[500-series scopes]] has two channels and a −3 dB point of 50 MHz at 50 mV/Div, 28 MHz at 5 mV/Div,
and 2 Hz to 15 MHz at 500 μV/Div when channels 1 and 2 are cascaded. It was designed by [[Ron Olson]].


* [http://manoman.sqhill.com/pdf/tek-1a1-early.pdf Tektronix 1A1 Manual (early) (PDF)]
There were three distinct versions of 1A1.
* [http://manoman.sqhill.com/pdf/tek-1a1-late.pdf Tektronix 1A1 Manual (late) (PDF)]
* The first version, from 1964 to 1966, has a [[Nuvistor]] front-end, and [[rotary_input_switch|rotary input switches]] that were concentric with the [[BNC]] jacks. The knobs to invert the input channels are concentric with the vertical position knobs.
* The second version, from 1966 to ??? has fluted round V/cm knobs, and lever switches. The channel inversion control is an organ-style pull-push knob.  The nuvistors are mounted under a thermal cover on a sub-chassis with rubber stand-offs.
* The third model, from ??? until the end has four-sided V/cm knobs and a FET front-end.
 
Type 1A1 uses the [[500_Series_plug-in_interface|"ALT SWEEP SLAVE PULSE" signal]] that is sent by scopes on pin 7 of the plug-in connector. 
In a Type [[547]] mainframe, this signal allows channel 1 to be displayed using the "A" timebase and channel 2 using the "B" timebase.
This is useful, for example, to view the IF and AF of a radio receiver at the same time. 
Even after the front-end transitioned from Nuvistors to FETs, the output amplifier continued to use Nuvistors.
 
Type 1A1 has an External Trigger output for mainframes prior to the [[547]] that don't support plug-in triggering, and supplies the trigger system on [[500 Series plug-in interface|pins 4/5 of the mainframe interface]].  It also has a ×10 amplified output from channel 1 that can be cascaded into the channel 2 input for 500 μV/Div sensitivity at reduced bandwidth (15 MHz).
 
Types 1A1 and [[1A2]] were [[introduced in 1964|introduced together in 1964]], the former for high-end use, the latter as an upgrade/replacement for [[CA|Type CA]]. 
Both remained available until the [[500-series scopes|500-series scope line]] was discontinued.
 
The 1A1 is not a perfect superset of the 1A2; it supplies external trigger from channel 1 only.
 
The 1A1 may have evolved from the [[J|Type J]], which never went into production.
 
{{BeginSpecs}}
{{Spec | Bandwidth | 50 MHz @ 50 mV/Div and up (in fast mainframes), 28 MHz @ 5 mV/Div, 15 MHz with cascaded channels (~0.5 mV/Div) }}
{{Spec | Rise time | 7 ns @ 50 mV/Div and up (in fast mainframes), 13 ns @ 5 mV/Div, 24 ns with cascaded channels (~0.5 mV/Div) }}
{{Spec | Deflection | 5 mV/Div to 20 V/Div, 1−2−5 }}
{{Spec | Max. input | 600 V DC + peak AC }}
{{Spec | Input impedance | 1 MΩ // 15 pF }}
{{Spec | Modes | Ch 1, Ch 2, ALT, CHOP, ADD }}
{{EndSpecs}}
 
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/1A1.html 1A1 @ amplifier.cd]
{{Documents|Link=1A1}}
 
==Pictures==


<gallery>
<gallery>
Image:1a1_frontend.png|Early 1A1 front end
Tek_1A1_Early_Front.jpeg | 1A1 SN121
Tek 1a1 early style.jpg|Early 1A1
Tek 1A1 front.jpg | Second 1A1 version
dual_1A1_2.JPG|left: Nuvistor right: FET
dual_1A1_1.JPG|left: Nuvistor right: FET
dual_1A1.JPG|left: Nuvistor right: FET
1A1 Nuvistor mount 1.jpg | Nuvistors under thermal cover, on shock-mounted sub-chassis
1A1 Nuvistor mount 2.jpg | Nuvistor cover and tubes unplugged
1A1 Nuvistor mount 3.jpg | Nuvistor cover and tubes, bottom
1a1_frontend.png|Early 1A1 front end
Tek 1a1 late output amp.png|Late 1A1 Output Amp
Tek 1a1 early left.jpg|Early 1A1 Left View
Tek 1a1 latest.jpg|Latest version of 1A1
Tek 556 two 1a1.jpg|[[556]] with second version 1A1 in left bay and first version 1A1 in right bay.
Tek 1a1 black.jpg|Black 1A1
Tek 1a1 latest guernsey.jpg|Latest version 1A1. Photo courtesy of Dan Wilson (Hideaway Studio).
Tek_1A1_Top.jpeg | 1A1 -  First Version - Top
Tek_1A1_Underside.jpeg | 1A1 -  First Version - Underside
Tek_1A1_RHS.jpeg | 1A1 -  First Version - RHS
Tek_1A1_LHS.jpeg | 1A1 -  First Version - LHS
Tek_1A1_FETFront-CH1.jpeg | Input FET board CH1
Tek_1A1_FETFront-CH2.jpeg | Input FET board CH2
Tek 1a1 front3.jpeg
</gallery>
</gallery>
==Components==
{{Parts|1A1}}
[[Category:500 series plugins]]

Latest revision as of 04:25, 11 March 2024

Tektronix 1A1
50 MHz dual channel amplifier
1A1 front view

Compatible with 500-series scopes

Produced from 1964 to 1975

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 1A1 plug-in for the 500-series scopes has two channels and a −3 dB point of 50 MHz at 50 mV/Div, 28 MHz at 5 mV/Div, and 2 Hz to 15 MHz at 500 μV/Div when channels 1 and 2 are cascaded. It was designed by Ron Olson.

There were three distinct versions of 1A1.

  • The first version, from 1964 to 1966, has a Nuvistor front-end, and rotary input switches that were concentric with the BNC jacks. The knobs to invert the input channels are concentric with the vertical position knobs.
  • The second version, from 1966 to ??? has fluted round V/cm knobs, and lever switches. The channel inversion control is an organ-style pull-push knob. The nuvistors are mounted under a thermal cover on a sub-chassis with rubber stand-offs.
  • The third model, from ??? until the end has four-sided V/cm knobs and a FET front-end.

Type 1A1 uses the "ALT SWEEP SLAVE PULSE" signal that is sent by scopes on pin 7 of the plug-in connector. In a Type 547 mainframe, this signal allows channel 1 to be displayed using the "A" timebase and channel 2 using the "B" timebase. This is useful, for example, to view the IF and AF of a radio receiver at the same time. Even after the front-end transitioned from Nuvistors to FETs, the output amplifier continued to use Nuvistors.

Type 1A1 has an External Trigger output for mainframes prior to the 547 that don't support plug-in triggering, and supplies the trigger system on pins 4/5 of the mainframe interface. It also has a ×10 amplified output from channel 1 that can be cascaded into the channel 2 input for 500 μV/Div sensitivity at reduced bandwidth (15 MHz).

Types 1A1 and 1A2 were introduced together in 1964, the former for high-end use, the latter as an upgrade/replacement for Type CA. Both remained available until the 500-series scope line was discontinued.

The 1A1 is not a perfect superset of the 1A2; it supplies external trigger from channel 1 only.

The 1A1 may have evolved from the Type J, which never went into production.

Key Specifications

Bandwidth 50 MHz @ 50 mV/Div and up (in fast mainframes), 28 MHz @ 5 mV/Div, 15 MHz with cascaded channels (~0.5 mV/Div)
Rise time 7 ns @ 50 mV/Div and up (in fast mainframes), 13 ns @ 5 mV/Div, 24 ns with cascaded channels (~0.5 mV/Div)
Deflection 5 mV/Div to 20 V/Div, 1−2−5
Max. input 600 V DC + peak AC
Input impedance 1 MΩ // 15 pF
Modes Ch 1, Ch 2, ALT, CHOP, ADD

Links

Documents Referencing 1A1

Document Class Title Authors Year Links
Martzloff High-speed Recording System.pdf Article High-Speed Transient Recording System François Martzloff 1968 544 • 1A1

Pictures

  • 1A1 SN121

    1A1 SN121

  • Early 1A1

    Early 1A1

  • Second 1A1 version

    Second 1A1 version

  • left: Nuvistor right: FET

    left: Nuvistor right: FET

  • left: Nuvistor right: FET

    left: Nuvistor right: FET

  • left: Nuvistor right: FET

    left: Nuvistor right: FET

  • Nuvistors under thermal cover, on shock-mounted sub-chassis

    Nuvistors under thermal cover, on shock-mounted sub-chassis

  • Nuvistor cover and tubes unplugged

    Nuvistor cover and tubes unplugged

  • Nuvistor cover and tubes, bottom

    Nuvistor cover and tubes, bottom

  • Early 1A1 front end

    Early 1A1 front end

  • Late 1A1 Output Amp

    Late 1A1 Output Amp

  • Early 1A1 Left View

    Early 1A1 Left View

  • Latest version of 1A1

    Latest version of 1A1

  • 556 with second version 1A1 in left bay and first version 1A1 in right bay.

    556 with second version 1A1 in left bay and first version 1A1 in right bay.

  • Black 1A1

    Black 1A1

  • Latest version 1A1. Photo courtesy of Dan Wilson (Hideaway Studio).

    Latest version 1A1. Photo courtesy of Dan Wilson (Hideaway Studio).

  • 1A1 - First Version - Top

    1A1 - First Version - Top

  • 1A1 - First Version - Underside

    1A1 - First Version - Underside

  • 1A1 - First Version - RHS

    1A1 - First Version - RHS

  • 1A1 - First Version - LHS

    1A1 - First Version - LHS

  • Input FET board CH1

    Input FET board CH1

  • Input FET board CH2

    Input FET board CH2

Components

Some Parts Used in the 1A1

Part Part Number(s) Class Description Used in
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311
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