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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 (95) MHz oscilloscope
|designers=John Gates;
|manuals=
* [[Media:070-170.pdf|Tektronix 581 Manual]]
* [[Media:070-390.pdf|Tektronix 581A Manual]] (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]].
It was designed by [[John Gates]].
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:581_old_1.JPG|early 581
Tek 581 1.jpg                   | 581A
Image:581_triggermods.JPG| TD trigger inseat 6DJ8 trigger.
Tek 581 2.jpg                   |
Image:581_old_2|wrickle and chrom on case.
Tek 581 3.jpg                   |
Image:Tek 581 1.jpg
Tek 581 5.jpg                   |
Image:Tek 581 2.jpg
Image:Tek 581 3.jpg
Image: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>
==Components==
{{Parts|581}}
{{Parts|581A}}
{{Plugins|580-series scopes}}
[[Category:580 series scopes]]

Latest revision as of 15:44, 18 August 2024

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

Produced from 1959 to 1972

Manuals

(All manuals in PDF format unless noted otherwise)
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. It was designed by John Gates. 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.

Key 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

  • early 581

    early 581

  • wrinkle and chrome from early 581

    wrinkle and chrome from early 581

  • TD trigger instead of 6DJ8 trigger

    TD trigger instead of 6DJ8 trigger

  • Selenium rectifier

    Selenium rectifier

581A

  • 581A

    581A

Schematics

  • early model 581 trigger using tubes

    early model 581 trigger using tubes

  • late model 581 trigger using tunnel diode

    late model 581 trigger using tunnel diode

  • 581 vertical output amp (distributed amplifier) driving CRT

    581 vertical output amp (distributed amplifier) driving CRT

Components

Some Parts Used in the 581

Part Part Number(s) Class Description Used in
120-0141-00 120-0141-00 Discrete component power transformer 581 • 581A • 585 • 585A
12AU6 154-0040-00 Vacuum Tube (Pentode) RF pentode 81 • 112 • 1L10 • 1L20 • 1L60 • 3L10 • 512 • 556 • 575 • 545 • 547 • 549 • 581 • 585 • A • B • C • G • K • H • L • ML • M • N • O • R • S • Z
12AU7 154-041 • 154-0041-00 • 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825
12AX7 154-043 • 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 • 513 • 524 • 531 • 531A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 570 • 581 • 581A • 585 • 585A • E • Q • Hickok 1825 • Keithley 610
12B4 154-044 • 154-0044-00 Vacuum Tube (Triode) power triode 126 • 310 • 310A • 316 • 317 • 502 • 502A • 524 • 526 • 541 • 541A • 535 • 535A • 545 • 545A • 546 • 547 • 570 • 549 • 551 • 555 • 513 • 581 • 581A • 585 • 585A • Keithley 610
18NO30 Discrete component 18 V, 30-second delay relay 581 • 585
5642 154-0051-00 • 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
5651 154-052 • 154-0052-00 • 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 • 160 • 310 • 310A • 502 • 503 • 504 • 511A • 512 • 516 • 517 • 524 • 526 • 531 • 531A • 535 • 536 • 541 • 541A • 543 • 543A • 543B • 545 • 545A • 545B • 570 • 549 • 581 • 581A • 585 • 585A
6080 154-0056-00 • 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 • 160 • 316 • 317 • 516 • 535 • 535A • RM35A • 541 • 541A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 565 • 567 • 575 • 581 • 581A • 585 • 585A
6939 Vacuum Tube (Dual Tetrode) dual tetrode 581 • 585
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D52 • Telequipment D56 • Telequipment S52
6AU5 154-021 • 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 • 513 • 516 • 517 • 517A • 531 • 535 • 541 • 535 • 545 • 547 • 581 • 581A • 585 • 585A
6AU6 154-0022-00 • 157-0073-00 • 157-0059-00 • 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 • 160 • 181 • 190 • 60 • 2A60 • 72 • 3A72 • 3C66 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 506 • 511 • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • 535 • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 561 • 561A • 561S • 564 • 565 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 80 • C • CA • Q
6CL6 154-031 • 154-0031-00 • 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 • 310 • 310A • 316 • 317 • 515 • 524 • 525 • 531 • 535 • 535A • 545 • 545A • 545B • 549 • 570 • 581 • 581A • 585 • 585A • 3A74
6CY5 154-0207-00 Vacuum Tube (Tetrode) tetrode 581 • 585 • 581A • 585A
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 106 • 132 • 360 • 51 • 527 • 581 • 581A • 585 • 585A • 3T77 • 3T77A
6NO45 Discrete component 6.3 V / 500 mA, 45-second delay relay 581 • 585
7699 Vacuum Tube (Dual Tetrode) dual tetrode 581 • 585
NE-2 150-002 • 150-0002-00 Gas Discharge Tube (neon lamp) Neon lamp 511 • 511A • 581 • 581A • 585 • 585A • 545A • TU-4
OC171 152-0102-00 Discrete component Germanium PNP transistor 581 • 585
STD615 152-0102-00 Discrete component 10 mA, 28 pF germanium tunnel diode 581 • 585 • TU-5
T581 154-0224-00 • 154-0228-00 • 154-0229-00 • 154-0230-00 • 154-0297-00 • 154-0354-00 • 154-0396-00 • 154-0435-00 • 154-0445-00 • 154-0446-00 • 154-0479-00 • 154-0479-01 • 154-0479-02 CRT CRT 581 • 585


Some Parts Used in the 581A

Part Part Number(s) Class Description Used in
120-0141-00 120-0141-00 Discrete component power transformer 581 • 581A • 585 • 585A
12AU7 154-041 • 154-0041-00 • 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825
12AX7 154-043 • 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 • 513 • 524 • 531 • 531A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 570 • 581 • 581A • 585 • 585A • E • Q • Hickok 1825 • Keithley 610
12B4 154-044 • 154-0044-00 Vacuum Tube (Triode) power triode 126 • 310 • 310A • 316 • 317 • 502 • 502A • 524 • 526 • 541 • 541A • 535 • 535A • 545 • 545A • 546 • 547 • 570 • 549 • 551 • 555 • 513 • 581 • 581A • 585 • 585A • Keithley 610
1N3848 152-0140-00 Discrete component 10 mA, 25 pF tunnel diode 581A • 585A • RM585A • 7B52 • S-53
5642 154-0051-00 • 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
5651 154-052 • 154-0052-00 • 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 • 160 • 310 • 310A • 502 • 503 • 504 • 511A • 512 • 516 • 517 • 524 • 526 • 531 • 531A • 535 • 536 • 541 • 541A • 543 • 543A • 543B • 545 • 545A • 545B • 570 • 549 • 581 • 581A • 585 • 585A
6080 154-0056-00 • 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 • 160 • 316 • 317 • 516 • 535 • 535A • RM35A • 541 • 541A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 565 • 567 • 575 • 581 • 581A • 585 • 585A
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D52 • Telequipment D56 • Telequipment S52
6AU5 154-021 • 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 • 513 • 516 • 517 • 517A • 531 • 535 • 541 • 535 • 545 • 547 • 581 • 581A • 585 • 585A
6AU6 154-0022-00 • 157-0073-00 • 157-0059-00 • 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 • 160 • 181 • 190 • 60 • 2A60 • 72 • 3A72 • 3C66 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 506 • 511 • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • 535 • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 561 • 561A • 561S • 564 • 565 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 80 • C • CA • Q
6CL6 154-031 • 154-0031-00 • 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 • 310 • 310A • 316 • 317 • 515 • 524 • 525 • 531 • 535 • 535A • 545 • 545A • 545B • 549 • 570 • 581 • 581A • 585 • 585A • 3A74
6CY5 154-0207-00 Vacuum Tube (Tetrode) tetrode 581 • 585 • 581A • 585A
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
6EW6 154-0212-00 Vacuum Tube (Pentode) pentode 106 • 132 • 360 • 51 • 527 • 581 • 581A • 585 • 585A • 3T77 • 3T77A
7788 154-0420-00 Vacuum Tube (Pentode) long life, shock and vibration resistant pentode 529 • RM529 • 581A • 585A • RM581 • RM585 • Telequipment D56 • 545B
8426 Vacuum Tube (Pentode) RF pentode O • 545A • 547 • 549 • 581A • 585A
NE-2 150-002 • 150-0002-00 Gas Discharge Tube (neon lamp) Neon lamp 511 • 511A • 581 • 581A • 585 • 585A • 545A • TU-4
SMTD995 152-0140-01 Discrete component 10 mA, 8 pF tunnel diode 1S1 • 1S2 • 1502 • 21A • 22A • 3T5 • 3T6 • 475 • 475A • 475M • 544 • R544 • 546 • RM546 • 547 • RM547 • 556 • R556 • 581A • 585A • RM585 • 7B52 • 7B53N • 7B70 • 7B71 • 7D10 • 7D11 • 7T11 • 7T11A • R7912 • S-51 • S-52 • TU-5 • 067-0572-00 • 067-0572-01 • 067-0681-00
T5810 154-0479-00 • 154-0479-01 • 154-0479-02 CRT CRT 581A • 585A


Some plug-ins / accessories compatible with 580-series scopes

Page Manufacturer Model Description Introduced Discontinued
80 Tektronix 80 vertical amplifier 1959 (?)
81 Tektronix Type 81 plug-in adapter 1960 1972
82 Tektronix 82 85 MHz dual-trace amplifier 1962 1972
84 Tektronix 84 calibration fixture 1962 (?)
86 Tektronix 86 vertical amplifier 1963 1972
TU-3 Tektronix calibration fixture (?) (?)
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