3A8: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar
title=Tektronix 3A8 |
|manufacturer=Tektronix
summary=Operational amplifier|
|series=560-series scopes
image=3a8-crop.jpg |  
|type=3A8
caption=3A8 front view |
|summary=Operational amplifier plug-in
introduced=1965 |
|image=Tek 3a8 front.jpeg
discontinued=1972 |
|caption=3A8 Front View
series=[[560-series scopes]]|
|introduced=1965
manuals=
|discontinued=1972
* [http://w140.com/tek_3a8.pdf Tektronix 3A8 Manual (PDF)]
|designers=Roy Hayes
* [[Media:Tek type 3a8 irb.pdf|Tektronix 3A8 Instrument Reference Book (PDF, OCR)]]
|manuals=
* [[Media:070-0507-00.pdf|Tektronix 3A8 Manual]]
* [[Media:Tek type 3a8 irb.pdf|Tektronix 3A8 Instrument Reference Book]] (OCR)
}}
}}
The '''Tektronix 3A8''' is an operational amplifier plug-in for [[560-series scopes]].
The '''Tektronix 3A8''' is an operational amplifier plug-in for [[560-series scopes]],  designed by [[Roy Hayes]] and [[introduced in 1965]].
It was designed by [[Roy Hayes]].
The 3A8 contains two operational amplifiers and a vertical display amplifier.


==Internals ==
Each operational amplifier has external inputs and outputs.
The 3A8 contains two operational amplifiers and one vertical display amplifier.
Input and feedback resistances / capacitances are separately switch-selectable to provide a variety of operational amplifier functions.
External components can be substituted by way of front panel banana jacks, which also accept special purpose modules (see ''Accessories'', below.)


The 3A8 display amplifier can accept inputs from the output of either operational amplifier or from an external input. The input can be AC or DC coupled and can be inverted if desired. It has several transistors plus three 9-pin miniature vacuum tubes: an [[8416]] and two [[6KV8]]s.
The display amplifier can be connected to the output of either operational amplifier, or an external input. The input can be AC or DC coupled and can be inverted.  


Each 3A8 operational amplifier can accept external inputs and has external as well as internal outputs. Each operational amplifier has a number of transistors plus three [[Nuvistor]]s: a [[6CW4]] and a selected pair of [[7586]]s.
{{BeginSpecs}}
{{Spec | Gain Bandwidth Product | ≥10 MHz }}
{{Spec | DC Open Loop Gain | ≥10,000  }}
{{Spec | Output | ≥±25 V driving ≥7.5 mA (including feedback current) }}
{{Spec | Display Amplifier Bandwidth | DC to 3.5 MHz }}
{{Spec | Display Amplifier Sensitivity | 20 mV/cm to 10 V/cm, 1−2−5 }}
{{EndSpecs}}


==Specifications==
==Internals ==
The vertical display amplifier has a bandwidth of DC-3.5 MHz with sensitivity from .02 to 10 V/cm.  
The 3A8 has several transistors plus three 9-pin vacuum tubes, an [[8416]] and two [[6KV8]]s.


The operational amplifiers have a gain bandwidth product ≥ 10 MHz and a DC open loop gain ≥ 10,000. Output voltage is ≥ ± 25 V. Output current is ≥ 7.5 mA (including feedback current.) Input and feedback resistances and capacitances are separately switch selectable to provide a variety of opamp functions. External components can be substituted by way of front panel banana sockets which also accept any of the following special purpose adapters:
Each operational amplifier has a number of transistors plus three [[Nuvistor]]s: a [[6CW4]] and a selected pair of [[7586]]s.


*[[013-0049-01]] Standard Shielded Cover (two supplied with each plugin)
==Accessories==
*[[013-0048-01]] Terminal Adapter Assembly (empty box for user chosen components)
:[[013-0048-01]] Terminal Adapter Assembly (empty box for user chosen components)
*[[013-081]] Compensating Adapter
:[[013-0049-01]] Standard Shielded Cover (two supplied with each plugin)
*[[013-068]] Gating Adapter
:[[013-0067-00]] Logarithmic Amplifier Adapter
*[[013-0086-00]] Leakage Current Adapter
:[[013-0068-00]] Gating Adapter
*[[013-0067-00]] Logarithmic Amplifier Adapter
:[[013-0081-00]] Compensating Adapter
:[[013-0086-00]] Leakage Current Adapter
 
==Calibration Fixtures==
:[[067-0507-00]] Grid Current Checker


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 3a8 1.JPG
Tek 3a8 front.jpeg
Tek 3a8 2.JPG
Tek 3a8 front2.jpeg
Tek 3a8 3.JPG
Tek 3A8 j5.jpeg | Front, no plugin covers
Tek 3a8 4.JPG
Tek 3A8 j6.jpeg | Front view, w/shield covers
Tek 3a8.jpg
Tek 3A8 j1.jpeg | 3A8 Left side
Tek 3A8 j2.jpeg | 3A8 Right side
</gallery>
</gallery>
==Components==
{{Parts|3A8}}


[[Category:560 series plugins]]
[[Category:560 series plugins]]

Latest revision as of 14:35, 6 December 2023

Tektronix 3A8
Operational amplifier plug-in
3A8 Front View

Compatible with 560-series scopes

Produced from 1965 to 1972

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 3A8 is an operational amplifier plug-in for 560-series scopes, designed by Roy Hayes and introduced in 1965. The 3A8 contains two operational amplifiers and a vertical display amplifier.

Each operational amplifier has external inputs and outputs. Input and feedback resistances / capacitances are separately switch-selectable to provide a variety of operational amplifier functions. External components can be substituted by way of front panel banana jacks, which also accept special purpose modules (see Accessories, below.)

The display amplifier can be connected to the output of either operational amplifier, or an external input. The input can be AC or DC coupled and can be inverted.

Key Specifications

 Gain Bandwidth Product ≥10 MHz
 DC Open Loop Gain ≥10,000
 Output ≥±25 V driving ≥7.5 mA (including feedback current)
Display Amplifier Bandwidth DC to 3.5 MHz
Display Amplifier Sensitivity 20 mV/cm to 10 V/cm, 1−2−5

Internals

The 3A8 has several transistors plus three 9-pin vacuum tubes, an 8416 and two 6KV8s.

Each operational amplifier has a number of transistors plus three Nuvistors: a 6CW4 and a selected pair of 7586s.

Accessories

013-0048-01 Terminal Adapter Assembly (empty box for user chosen components)
013-0049-01 Standard Shielded Cover (two supplied with each plugin)
013-0067-00 Logarithmic Amplifier Adapter
013-0068-00 Gating Adapter
013-0081-00 Compensating Adapter
013-0086-00 Leakage Current Adapter

Calibration Fixtures

067-0507-00 Grid Current Checker

Pictures

  • Front, no plugin covers

    Front, no plugin covers

  • Front view, w/shield covers

    Front view, w/shield covers

  • 3A8 Left side

    3A8 Left side

  • 3A8 Right side

    3A8 Right side

Components

Some Parts Used in the 3A8

Part Part Number(s) Class Description Used in
6CW4 154-0323-00 Vacuum Tube (Triode) Nuvistor triode 1A7 • 3A8 • 3B2 • 3S76 • 6R1 • 565 • S-311
6KV8 154-497 • 154-0497-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 3A8
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
8416 154-0413-00 • 157-0116-00 Vacuum Tube (Dual Triode) dual triode 1S1 • 2A61 • 3A8 • 3L5 • W
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