1A2: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar  
title=Tektronix 1A2|
|manufacturer=Tektronix
summary=50 MHz dual channel amplifier|
|series=500-series scopes
image=Tek 1a2 new.jpg |  
|type=1A2
caption=1A2 front view|
|summary=50 MHz dual channel amplifier
introduced=1964 |
|image=Tek 1a2 front.jpeg
discontinued=1975 |
|caption=1A2 front view
series=[[500-series scopes]]|
|introduced=1964  
manuals=
|discontinued=1975  
* [http://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual (PDF)]
|designers=Larry Biggs
 
|manuals=
* [[Media:070-0430-01.pdf|Tektronix 1A2 Manual (PDF, bad-OCR)]]
* [[Media:070-0430-01.pdf|Tektronix 1A2 Manual]]
* [[Media:Tek 1a2 notes.pdf|Tektronix 1A2 Notes]]
* [[Media:1a2 sn6220 parts correction.pdf|Tektronix 1A2 Parts Correction at Serial Number 6220]]
* [[Media:TM-11-6625-2517-14.pdf|Military manual for Tektronix 1A2]]
* [[Media:Tek 1a2 cal outline.pdf|Tektronix 1A2 Calibration Outline]] (OCR)
<small>
'''Alternate copies'''
* [https://w140.com/mmm/tek-1a2.pdf Tektronix 1A2 Manual]
'''
}}
}}
The '''Tektronix 1A2''' is a two-channel plug-in amplifier for [[500-series scopes]].
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 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]].
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
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 and channel 2 to timebase B.   
ten times the sensitivity at a higher price and is able to lock channel 1 to Type [[547]]'s timebase A
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]]).   
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
circuits have few details in common.


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


The 1A2 uses a [[7586]] [[nuvistor]] at the front end as a cathode follower.
{{MissingSpecs}}
Then one input of an NPN differential amplifier is driven to produce a differential current-mode signal at the collectors.
 
==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.
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.
A cross-coupled pair of PNP transistors forms a multivibrator that generates the voltages that control the diodes that select the input channel.
==Specifications==
[[Category:Specifications needed]] ''please add''


==Pictures==
==Pictures==
Line 52: Line 61:
Tek 1a2 b4.jpg
Tek 1a2 b4.jpg
Tek 1a2 b5.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>
==Components==
{{Parts|1A2}}


[[Category:500 series plugins]]
[[Category:500 series plugins]]

Latest revision as of 16:24, 14 December 2023

Tektronix 1A2
50 MHz dual channel amplifier
1A2 front view

Compatible with 500-series scopes

Produced from 1964 to 1975

Manuals
Manuals – Specifications – Links – Pictures

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

Components

Some Parts Used in the 1A2

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