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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]].
|manufacturer=Tektronix
The vertical signal path of the 581 is the same as that of the 585. It uses the [[T581]] CRT.  There is also a 581A, which
|series=580-series scopes
has [[tunnel diodes|tunnel diode]] triggering.
|model=581
|image=581_old_1.JPG
|caption=Tektronix 581 (early model)
|introduced=1959
|discontinued=1972
|summary=100 MHz (85 MHz) oscilloscope
|designers=John Gates;
|manuals=
* [[Media:070-170.pdf|Tektronix 581 Manual]] (PDF)
* [[Media:070-390.pdf|Tektronix 581A Manual]] (PDF, OCR)
* [[Media:070-426.pdf|Tektronix 581A Manual 070-426]] needed
<small>
* Factory Calibration Procedure: [[Media:Tek 581a fcp dec 1968.pdf|Dec 1968]] / [[Media:Tek 581a fcp march 1967.pdf|March 1967]]
* [[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]].


Manual needed.
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.
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
was specified to 100 MHz.
{{BeginSpecs}}
{{Spec | Rise time | 3.5 ns with [[80 | Type 80]] plugin and [[P80|P80 probe]] }}
{{Spec | Timebase | 50 ns/Div to 2 s/Div, 1−2−5, variable ×2.5, magnifier ×5, single sweep; X input }}
{{Spec | CRT | [[T581]], distributed vertical deflection plates, 10 kV acceleration }}
{{Spec | Outputs | A Sawtooth, A Gate, B Gate, Calibrator (0.2 mV to 100 V<sub>p-p</sub>, 1−2−5) }}
{{EndSpecs}}
==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>
===581A===
<gallery>
<gallery>
Image:Tek 581 1.jpg
Tek 581 1.jpg                   | 581A
Image:Tek 581 2.jpg
Tek 581 2.jpg                   |
Image:Tek 581 3.jpg
Tek 581 3.jpg                   |
Image:Tek 581 5.jpg
Tek 581 5.jpg                   |
</gallery>
</gallery>
===Schematics===
<gallery>
Tek 581 early trig.png          | early model 581 trigger using tubes
Tek 581 late trig.png          | late model 581 trigger using tunnel diode
Tek 581 vertical output amp.png | 581 vertical output amp ([[distributed amplifier]]) driving CRT
</gallery>
{{Parts|581}}
[[Category:580 series scopes]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/5400...66016"

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