1A1: Difference between revisions

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title=Tektronix 1A1|
title=Tektronix 1A1|
summary=50 MHz dual channel amplifier|
summary=50 MHz dual channel amplifier|
image=tek 1a1 front.jpg |  
image=Tek 1A1 front.jpg |  
caption=1A1 front view|
caption=1A1 front view|
introduced=1964 |
introduced=1964 |
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}}
}}
The '''Tektronix Type 1A1''' plug-in for the [[500-series scopes]] has two channels
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 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.
and 2 Hz to 15 MHz at 500 μV/Div when channels 1 and 2 are cascaded.


There were three distinct versions of 1A1.
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 the vertical position knobs.
* 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 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.
* 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.   
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,  
In a Type [[547]] mainframe, this signal allows channel 1 to be displayed using the "A" timebase  
this signal allows channel 1 to be displayed using the "A" timebase  
and channel 2 using the "B" 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]],  
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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.


==Specifications==
{{BeginSpecs}}
[[Category:Specifications needed]]  ''please add''
{{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==
==Links==
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<gallery>
<gallery>
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

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