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The Tektronix Type 81 is a plug-in adapter so that [[letter-series and 1-series plug-ins]] can
{{Plugin Sidebar
be used in [[580-series scopes]]. The Type 81 contains a two-stage amplifier. The letter-series
|manufacturer=Tektronix
plug-in drives the input stage of the Type 81 which is a high impedance, similar to the input
|type=Type 81
of a 530-, 540-, or 550-series scope. The second stage of the Type 81 is a cathode-follower,
|summary=plug-in adapter
which drives the 580-series scope using a low impedance, as is required by 580-series scopes.
|image=81.JPG
|caption=Type 81 with a [[1A2]] in a [[585|585A]]
|introduced=1960
|discontinued=1972
|designers=Bill DeVey;John Gates;
|series=580-series scopes
|manuals=
* [[Media:070-232.pdf|Tektronix Type 81 Manual]]
* [[Media:070-0751-00.pdf|Tektronix Type 81A Manual]]
<small>
'''Factory Calibration Procedures'''
* [https://w140.com/tek_fcp/tek_type_81_factory_cal_proc.pdf Type 81 FCP]
* [[Media:Tek 81a fcp may 1967.pdf|Type 81A FCP]]
</small>
}}
The '''Tektronix Type 81''' is a plug-in adapter so that
[[letter-series and 1-series plug-ins]] can be used in [[580-series scopes]].


Type 81 is tubebase and has bandwidth of 33 megacycle.
The 81 and 81A are significantly different.
Type 81A is solid state and has bandwidth of 50 megacycle.
Type 81 is tube-based and has a bandwidth of 33 MHz.
81 and 81A are not same.  
Type 81A is solid-state and has a bandwidth of 50 MHz.
The 81A was designed by [[John Gates]].


* [http://w140.com/tek-81.pdf Tektronix Type 81 Manual (PDF)]
{{MissingSpecs}}
* [http://w140.com/tek-81a.pdf Tektronix Type 81A Manual (PDF)]


==Internals ==
The Type 81 contains a two-stage amplifier.  The letter-series plug-in drives
the input stage of the Type 81 which is high impedance (grids of a [[6GM8]] stage with [[T-coil peaking]])
so that the plug-in sees conditions similar to the [[500_Series_plug-in_interface|input of a 530-, 540-, or 550-series scope]]. 
The second stage is a [[6DJ8]] cathode-follower, which drives the [[580_Series_plug-in_interface|580-series scope's 93 Ω input impedance]].
Type 81 also terminates the grid line of the [[Distributed_amplifier | distributed vertical amplifier]] (delay line driver).
Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.
The Type 81 does not have a [[547#Spoiler_Switch|spoiler switch]].
The Type 81A has a spoiler switch.
==Pictures==
===Type 81===
<gallery>
81.JPG            |Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
81-2.JPG          |Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
Type-81-schem.png |Type 81 Schematic
Tek 81 front.jpg
Tek 81 1.jpg
Tek 81 2.jpg
Tek 81 3.jpg
Tek 81 4.jpg
Tek 81 5.jpg
Tek 81 6.jpg
Tek 81 7.jpg
Tek 81 8.jpg
</gallery>
===Type 81A===
<gallery>
<gallery>
Image:Type-81-schem.png
Tek type 81a 1.jpg
Tek type 81a 2.jpg
Tek type 81a 3.jpg
Tek type 81a 4.jpg
Tek type 81a 5.jpg
Tek type 81a 6.jpg
Tek type 81a 7.jpg
Tek 81a schematic.png | Type 81A Schematic
</gallery>
</gallery>
==Components==
{{Parts|81}}
{{Parts|81A}}
[[Category:580 series plugins]]

Latest revision as of 06:24, 6 December 2023

Tektronix Type 81
plug-in adapter
Type 81 with a 1A2 in a 585A

Compatible with 580-series scopes

Produced from 1960 to 1972

Manuals

Factory Calibration Procedures

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

The Tektronix Type 81 is a plug-in adapter so that letter-series and 1-series plug-ins can be used in 580-series scopes.

The 81 and 81A are significantly different. Type 81 is tube-based and has a bandwidth of 33 MHz. Type 81A is solid-state and has a bandwidth of 50 MHz. The 81A was designed by John Gates.

Key Specifications

  • please add

Internals

The Type 81 contains a two-stage amplifier. The letter-series plug-in drives the input stage of the Type 81 which is high impedance (grids of a 6GM8 stage with T-coil peaking) so that the plug-in sees conditions similar to the input of a 530-, 540-, or 550-series scope. The second stage is a 6DJ8 cathode-follower, which drives the 580-series scope's 93 Ω input impedance. Type 81 also terminates the grid line of the distributed vertical amplifier (delay line driver).

Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.

The Type 81 does not have a spoiler switch. The Type 81A has a spoiler switch.

Pictures

Type 81

  • Type 81 with a 1A2 in a Netherlands-made 585A

    Type 81 with a 1A2 in a Netherlands-made 585A

  • Type 81 with a 1A2 in a Netherlands-made 585A

    Type 81 with a 1A2 in a Netherlands-made 585A

  • Type 81 Schematic

    Type 81 Schematic

Type 81A

  • Type 81A Schematic

    Type 81A Schematic

Components

Some Parts Used in the 81

Part Part Number(s) Class Description Used in
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
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
6GM8 154-259 • 154-0259-00 Vacuum Tube (Dual Triode) dual triode 81 • 516 • S


Some Parts Used in the 81A

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