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rating detail per https://vintagetek.org/wp-content/uploads/2017/07/Tek-CRT-History-Keller-Feb-2007-Pt4.pdf
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(rating detail per https://vintagetek.org/wp-content/uploads/2017/07/Tek-CRT-History-Keller-Feb-2007-Pt4.pdf)
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The Tektronix 581 is similar to the [[585]], but with simplified trigger and sweep circuitry.
{{Oscilloscope Sidebar|
It was [[introduced in 1959]].
title=Tektronix 581|
The vertical signal path of the 581 is the same as that of the 585.   
image=581_old_1.JPG|
It uses the [[T581]] CRT.   
caption=Tektronix 581 (early model) |
Type 581 scopes with serial numbers up to 510 use an all-tube trigger cicrcuit.
introduced=1959 |
discontinued=1972 |
summary=100 MHz (85 MHz) oscilloscope|
manuals=
* [http://w140.com/tek_581_sn1273.pdf Tektronix 581 Manual (PDF)]
* [http://w140.com/581a_by_matt.pdf Tektronix 581A Manual (PDF)]
* [[Media:Service Scope 39 Aug 1966.pdf|580 series gain adjustment procedure, in Service Scope 39, Aug 1966]]
}}
 
The '''Tektronix 581''' is a 100 MHz tube scope [[introduced in 1959]] as a single time base version of the [[585]].
Like all [[580-series_scopes|580-series scopes]], it uses [[580-series_plug-ins|580-series plug-ins]].
 
The 58x series were the first Tektronix scopes to use [[distributed deflection plates]] and the last to use [[distributed amplifier]]s for vertical deflection.
At 100 MHz (down-rated to 95 MHz in 1962 and 85 MHz for the 581A) with the [[80|Type 80 plug-in]] and up to 85 MHz with the dual-channel [[82|Type 82]],
they were the highest-speed general purpose scopes of Tek's tube scope era (the 1 GHz [[519]] was specialized with no vertical amplifier).
 
The vertical signal path of the 581 is the same as that of the 585.  It uses the [[T581]] CRT.   
Type 581 scopes with serial numbers up to 510 use an all-tube trigger circuit.
Starting at serial number 511, the 581 uses [[tunnel diodes|tunnel diode]] triggering.
Starting at serial number 511, the 581 uses [[tunnel diodes|tunnel diode]] triggering.
   
   
A Type 581A was introduced later, and it is specified to have a bandwidth of 85MHz instead of 100MHz.
A Type 581A was introduced in 1963, and it is specified to have a bandwidth of 85 MHz instead of 100 MHz.
The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope  
The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope  
was specified to 100MHz.
was specified to 100 MHz.
 
==Specifications==
[[Category:Specifications needed]] ''please add''
 
==Pictures==
===581===
<gallery>
581_old_1.JPG                  | early 581
581_old_2.JPG                  | wrinkle and chrome from early 581
581_triggermods.JPG            | TD trigger instead of 6DJ8 trigger
581_selenium.JPG                | Selenium rectifier
</gallery>


* [http://w140.com/tek_581_sn1273.pdf Tektronix 581 Manual (PDF)]
===581A===
* [http://w140.com/581a_by_matt.pdf Tektronix 581A Manual (PDF)]
<gallery>
Tek 581 1.jpg                  | 581A
Tek 581 2.jpg                  |
Tek 581 3.jpg                  |
Tek 581 5.jpg                  |
</gallery>


===Schematics===
<gallery>
<gallery>
Image:581_old_1.JPG|early 581
Tek 581 early trig.png          | early model 581 trigger using tubes
Image:581_old_2.JPG|wrinkle and chrome from early 581.
Tek 581 late trig.png          | late model 581 trigger using tunnel diode
Image:581_triggermods.JPG| TD trigger instead of 6DJ8 trigger.
Tek 581 vertical output amp.png | 581 vertical output amp ([[distributed amplifier]]) driving CRT
Image:Tek 581 1.jpg
Image:Tek 581 2.jpg
Image:Tek 581 3.jpg
Image:Tek 581 5.jpg
</gallery>
</gallery>
[[Category:580 series scopes]]
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