Difference between revisions of "581"

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The Tektronix 581 is similar to the [[585]], but with simplified trigger and sweep circuitry.
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{{Oscilloscope Sidebar
It was [[introduced in 1959]].
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|manufacturer=Tektronix
The vertical signal path of the 581 is the same as that of the 585. It uses the [[T581]] CRT.
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|series=580-series scopes
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|model=581
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|image=581_old_1.JPG
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|caption=Tektronix 581 (early model)
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|introduced=1959
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|discontinued=1972
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|summary=100 MHz (85 MHz) oscilloscope
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|designers=John Gates;
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|manuals=
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* [[Media:070-170.pdf|Tektronix 581 Manual]] (PDF)
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* [[Media:070-390.pdf|Tektronix 581A Manual]] (PDF, OCR)
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* [[Media:070-426.pdf|Tektronix 581A Manual 070-426]] needed
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<small>
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* Factory Calibration Procedure: [[Media:Tek 581a fcp dec 1968.pdf|Dec 1968]] / [[Media:Tek 581a fcp march 1967.pdf|March 1967]]
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* [[Media:Service Scope 39 Aug 1966.pdf|580 series gain adjustment procedure, in Service Scope 39, Aug 1966]]
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}}
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The '''Tektronix 581''' is a 100 MHz tube scope [[introduced in 1959]] as a single time base version of the [[585]].
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Like all [[580-series_scopes|580-series scopes]], it uses [[580-series_plug-ins|580-series plug-ins]].
  
Manual needed.
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The 58x series were the first Tektronix scopes to use [[distributed deflection plates]] and the last to use [[distributed amplifier]]s for vertical deflection.
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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]],
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they were the highest-speed general purpose scopes of Tek's tube scope era (the 1 GHz [[519]] was specialized with no vertical amplifier).
  
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The vertical signal path of the 581 is the same as that of the 585.  It uses the [[T581]] CRT. 
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Type 581 scopes with serial numbers up to 510 use an all-tube trigger circuit.
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Starting at serial number 511, the 581 uses [[tunnel diodes|tunnel diode]] triggering.
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A Type 581A was introduced in 1963, and it is specified to have a bandwidth of 85 MHz instead of 100 MHz.
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The somewhat relaxed bandwidth specification improved CRT production yield which had been a problem when the scope
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was specified to 100 MHz.
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{{BeginSpecs}}
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{{Spec | Rise time | 3.5 ns with [[80 | Type 80]] plugin and [[P80|P80 probe]] }}
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{{Spec | Timebase | 50 ns/Div to 2 s/Div, 1−2−5, variable ×2.5, magnifier ×5, single sweep; X input }}
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{{Spec | CRT | [[T581]], distributed vertical deflection plates, 10 kV acceleration }}
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{{Spec | Outputs | A Sawtooth, A Gate, B Gate, Calibrator (0.2 mV to 100 V<sub>p-p</sub>, 1−2−5) }}
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{{EndSpecs}}
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==Pictures==
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===581===
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<gallery>
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581_old_1.JPG                  | early 581
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581_old_2.JPG                  | wrinkle and chrome from early 581
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581_triggermods.JPG            | TD trigger instead of 6DJ8 trigger
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581_selenium.JPG                | Selenium rectifier
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</gallery>
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===581A===
 
<gallery>
 
<gallery>
Image:Tek 581 1.jpg
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Tek 581 1.jpg                   | 581A
Image:Tek 581 2.jpg
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Tek 581 2.jpg                   |
Image:Tek 581 3.jpg
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Tek 581 3.jpg                   |
Image:Tek 581 5.jpg
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Tek 581 5.jpg                   |
 
</gallery>
 
</gallery>
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===Schematics===
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<gallery>
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Tek 581 early trig.png          | early model 581 trigger using tubes
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Tek 581 late trig.png          | late model 581 trigger using tunnel diode
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Tek 581 vertical output amp.png | 581 vertical output amp ([[distributed amplifier]]) driving CRT
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</gallery>
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{{Parts|581}}
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{{Parts|581A}}
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[[Category:580 series scopes]]

Latest revision as of 17:06, 10 October 2021

Tektronix 581
100 MHz (85 MHz) oscilloscope
Tektronix 581 (early model)

Produced from 1959 to 1972

Manuals
Manuals – Specifications – Links – Pictures

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, it uses 580-series plug-ins.

The 58x series were the first Tektronix scopes to use distributed deflection plates and the last to use distributed amplifiers for vertical deflection. At 100 MHz (down-rated to 95 MHz in 1962 and 85 MHz for the 581A) with the Type 80 plug-in and up to 85 MHz with the dual-channel 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 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.

Specifications

Rise time 3.5 ns with Type 80 plugin and P80 probe
Timebase 50 ns/Div to 2 s/Div, 1−2−5, variable ×2.5, magnifier ×5, single sweep; X input
CRT T581, distributed vertical deflection plates, 10 kV acceleration
Outputs A Sawtooth, A Gate, B Gate, Calibrator (0.2 mV to 100 Vp-p, 1−2−5)

Pictures

581

581A

Schematics


Some Parts used in the 581

Page Class Description Used in
12AU6 Vacuum Tube (Pentode) RF pentode 112 512 556 575 545 549 581 585 C G K H L M Z
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6939 Vacuum Tube (Double Tetrode) dual tetrode 581 585
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6AU5 Vacuum Tube (Pentode) 10 W beam power pentode 513 531 535 541 535 545 581 581A 585 585A
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6CY5 Vacuum Tube (Tetrode) tetrode 581 585 581A 585A
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
6EW6 Vacuum Tube (Pentode) pentode 132 527 581 581A 585 585A
7699 Vacuum Tube (Double Tetrode) dual tetrode 581 585
T581 CRT CRT 581 585

Some Parts used in the 581A

Page Class Description Used in
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6AU5 Vacuum Tube (Pentode) 10 W beam power pentode 513 531 535 541 535 545 581 581A 585 585A
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6CY5 Vacuum Tube (Tetrode) tetrode 581 585 581A 585A
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
6EW6 Vacuum Tube (Pentode) pentode 132 527 581 581A 585 585A
7788 Vacuum Tube (Pentode) long life, shock and vibration resistant pentode 581A 585A RM581 RM585
8426 Vacuum Tube (Pentode) RF pentode O 545A 549 581A 585A
T5810 CRT CRT 581A 585A