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{{Plugin Sidebar 2 |
{{Plugin Sidebar  
title=Tektronix 1A1|
|manufacturer=Tektronix
summary=50 MHz dual channel amplifier|
|series=500-series scopes
image=tek 1a1 front.jpg |  
|type=1A1
caption=1A1 front view|
|summary=50 MHz dual channel amplifier
introduced=1964 |
|image=Tek 1A1 front.jpg  
discontinued=1975 |
|caption=1A1 front view
series=[[500-series scopes]]|
|introduced=1964  
manuals=
|discontinued=1975  
* [http://w140.com/mmm/tek-1a1-early.pdf Tektronix 1A1 Manual (early) (PDF)]
|designers=Ron Olson
* [http://w140.com/mmm/tek-1a1-late.pdf Tektronix 1A1 Manual (late) (PDF)]
|manuals=
* [http://w140.com/tek_fcp/tek_type_1a1_factory_cal_proc.pdf Tektronix 1A1 Field Recalibration Procedure (PDF)]
* [[Media:070-378.pdf|Tektronix 1A1 Manual (early)]] (bad-OCR)
* [http://w140.com/Tektronix_1A1_SN20000up_german_short_version_300dpi.pdf Tektronix 1A1 Manual SN20000-up German Short Version (PDF)]
* [[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]]
 
<!--
* [https://w140.com/mmm/tek-1a1-early.pdf Tektronix 1A1 Manual (early)]
* [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.
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_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.


Early production used a [[Nuvistor]] 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.   
and [[rotary_input_switch|rotary input switches]] that were concentric
In a Type [[547]] mainframe, this signal allows channel 1 to be displayed using the "A" timebase and channel 2 using the "B" timebase.
with the [[BNC]] jacks, while later units have FETs and lever switches. 
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.   
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,  
Even after the front-end transitioned from Nuvistors to FETs, the output amplifier continued to use Nuvistors.
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.
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]],  
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]].   
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.
Both remained available until the [[500-series scopes|500-series scope line]] was discontinued.


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


Tektronix' German distributor, ''[[Rohde & Schwarz]]'', apparently manufactured a version of the 1A1 in Germany (see Links).
{{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) }}
==Specifications==
{{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) }}
[[Category:Specifications needed]]  ''please add''
{{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==
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/1A1.html 1A1 @ amplifier.cd] (pictures of a German-produced 1A1)
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/1A1.html 1A1 @ amplifier.cd]
{{Documents|Link=1A1}}


==Pictures==
==Pictures==


<gallery>
<gallery>
Tek_1A1_Early_Front.jpeg | 1A1 SN121
Tek 1a1 early style.jpg|Early 1A1
Tek 1a1 early style.jpg|Early 1A1
Tek 1A1 front.jpg | Second 1A1 version
dual_1A1_2.JPG|left: Nuvistor right: FET
dual_1A1_2.JPG|left: Nuvistor right: FET
dual_1A1_1.JPG|left: Nuvistor right: FET
dual_1A1_1.JPG|left: Nuvistor right: FET
dual_1A1.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
1a1_frontend.png|Early 1A1 front end
Tek 1a1 late output amp.png|Late 1A1 Output Amp
Tek 1a1 late output amp.png|Late 1A1 Output Amp
Tek 1a1 early left.jpg|Early 1A1 Left View
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]]
[[Category:500 series plugins]]
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