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The Tektronix 1A2 is a two-channel plug-in amplifier for [[500-series scopes]].  It provides a -3dB point of
{{Plugin Sidebar 2|
50MHz in a [[544]], [[546]], or [[547]], and 50mV/div sensitivity. It uses a [[7586]] [[nuvistor]] at the front end as a cathode follower.
title=Tektronix 1A2|
Then one input of an NPN differential amplifier is driven to produce a differential current-mode signal at
summary=50 MHz dual channel amplifier|
the collectors.  Silicon diodes form an analog multiplexer that switches between the two inputs.
image=Tek 1a2 new.jpg |
A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control
caption=1A2 front view|
the diodes that select the input channel.
introduced=1964 |
discontinued=1975 |
series=[[500-series scopes]]|
manuals=
* [http://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual (PDF)]


Type 1A2 was [[introduced in 1964]] together with Types [[1A1]], [[543|543B]], [[545|545B]], [[544]], [[546]], and [[547]].
* [[Media:070-0430-01.pdf|Tektronix 1A2 Manual (PDF, OCR, bad-OCR)]]
It was designed to replace the venerable Type [[CA]], while the Type [[1A1]] delivered
* [[Media:Tek 1a2 notes.pdf|Tektronix 1A2 Notes (PDF, needs OCR)]]
* [[Media:1a2 sn6220 parts correction.pdf|Tektronix 1A2 Parts Correction at Serial Number 6220 (PDF)]]
* [[Media:TM-11-6625-2517-14.pdf|Military manual for Tektronix 1A2 (PDF)]]
}}
 
The '''Tektronix 1A2''' is a two-channel plug-in amplifier for [[500-series scopes]].
It provides a −3 dB point of 50 MHz in a [[544]], [[546]], [[547]], or [[556]], and 50 mV/div sensitivity.
It was designed by [[Larry Biggs]].
 
The Type 1A2 was [[introduced in 1964]] together with Types [[1A1]], [[543|543B]], [[545|545B]], [[544]], [[546]], and [[547]].
It was designed to replace the venerable [[CA|Type CA]], while the [[1A1]] delivered
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A
and channel 2 to timebase B.  On the other hand, Type 1A2 can select which channel provides triggering
and channel 2 to timebase B.  On the other hand, Type 1A2 can select which channel provides triggering
when the mainframe is set to Plug-In mode.  They share some mechanical design, but the
when the mainframe is set to Plug-In mode, for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]).   
circuits have few details in common.


The 1A2 remained available until the [[500-series scopes|500-series scope line]] was discontinued after 1974.
The 1A2 remained available until the [[500-series scopes|500-series scope line]] was discontinued.


* [http://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual (PDF)]
{{MissingSpecs}}
 
==Internals==
1A1 and 1A2 share some mechanical design, but the circuits have few details in common.
 
Below serial number 11000, the 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower.
Above serial number 11100, the front-end uses a FET for this function.  
After the front-end buffer, one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors.
 
Silicon diodes form an analog multiplexer that switches between the two inputs.
A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control the diodes that select the input channel.
 
==Pictures==


<gallery>
<gallery>
Image:Tek 1a2 front.jpg
Tek 1a2 new.jpg
Image:Tek 1a2 top.jpg
Tek 1a2 front.jpg
Image:Tek 1a2 rear.jpg
Tek 1a2 top.jpg
Tek 1a2 rear.jpg
Tek 1a2 left.jpg|1A2 right
Tek 1a2 right.jpg|1A2 left
Tek 1a2 top2.jpg|1A2 top
Tek 1a2 bottom.jpg|1A2 bottom
Tek 1a2 bottom2.jpg
Tek 1a2 front2.jpg
Tek 1a2 front3.jpg
Tek 1a2 b1.jpg
Tek 1a2 b2.jpg
Tek 1a2 b3.jpg
Tek 1a2 b4.jpg
Tek 1a2 b5.jpg
1a2front132.jpg|1A2 serial number 132
1a2top132.jpg|1A2 serial number 132
1a2nuvistor132.jpg|1A2 serial number 132
1a2bottom132.jpg|1A2 serial number 132
</gallery>
</gallery>
[[Category:500 series plugins]]

Revision as of 19:00, 31 January 2021

Template:Plugin Sidebar 2

The Tektronix 1A2 is a two-channel plug-in amplifier for 500-series scopes. It provides a −3 dB point of 50 MHz in a 544, 546, 547, or 556, and 50 mV/div sensitivity. It was designed by Larry Biggs.

The Type 1A2 was introduced in 1964 together with Types 1A1, 543B, 545B, 544, 546, and 547. It was designed to replace the venerable Type CA, while the 1A1 delivered ten times the sensitivity at a higher price and is able to lock channel 1 to Type 547's timebase A and channel 2 to timebase B. On the other hand, Type 1A2 can select which channel provides triggering when the mainframe is set to Plug-In mode, for scopes having this feature (544, 546, 547, 549, 556, late 555).

The 1A2 remained available until the 500-series scope line was discontinued.

Key Specifications

  • please add

Internals

1A1 and 1A2 share some mechanical design, but the circuits have few details in common.

Below serial number 11000, the 1A2 uses a 7586 nuvistor at the front end as a cathode follower. Above serial number 11100, the front-end uses a FET for this function. After the front-end buffer, one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors.

Silicon diodes form an analog multiplexer that switches between the two inputs. A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control the diodes that select the input channel.

Pictures