1A1: Difference between revisions

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The Type 1A1 plug-in has two channels and a -3dB point of 50MHz.
{{Plugin Sidebar
|manufacturer=Tektronix
|series=500-series scopes
|type=1A1
|summary=50 MHz dual channel amplifier
|image=Tek 1A1 front.jpg
|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]]
 
<!--
* [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. 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.
 
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>
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>
 
==Components==
{{Parts|1A1}}
 
[[Category:500 series plugins]]

Latest revision as of 05:25, 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

Pictures

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