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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix Type 81|
|manufacturer=Tektronix
summary=Plugin Adapter|
|type=Type 81
image=81.JPG |  
|summary=plug-in adapter
caption=Type 81 front view|
|image=81.JPG  
introduced=1960 |
|caption=Type 81 with a [[1A2]] in a [[585|585A]]
discontinued=1972 |
|introduced=1960  
type=Adapter|
|discontinued=1972  
series=[[580-series scopes]]|
|designers=Bill DeVey;John Gates;
manuals=
|series=580-series scopes
* [http://w140.com/tek-81.pdf Tektronix Type 81 Manual (PDF)]
|manuals=
* [http://w140.com/tek-81a.pdf Tektronix Type 81A Manual (PDF)]
* [[Media:070-232.pdf|Tektronix Type 81 Manual]]
* [http://w140.com/tek_fcp/tek_type_81_factory_cal_proc.pdf Tektronix Type 81 Factory Calibration Procedure (PDF)]
* [[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]].   
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]].
{{MissingSpecs}}
==Internals ==
The Type 81 contains a two-stage amplifier.  The letter-series plug-in drives
The Type 81 contains a two-stage amplifier.  The letter-series plug-in drives
the input stage of the Type 81 which is a high impedance, similar to the input  
the input stage of the Type 81 which is high impedance (grids of a [[6GM8]] stage with [[T-coil peaking]])
of a 530-, 540-, or 550-series scope.  The second stage of the Type 81 is a  
so that the plug-in sees conditions similar to the [[500_Series_plug-in_interface|input of a 530-, 540-, or 550-series scope]].   
cathode-follower, which drives the 580-series scope using a low impedance, as
The second stage is a [[6DJ8]] cathode-follower, which drives the [[580_Series_plug-in_interface|580-series scope's 93 Ω input impedance]].
is required by 580-series scopes.
Type 81 also terminates the grid line of the [[Distributed_amplifier | distributed vertical amplifier]] (delay line driver).  


The 81 and 81A are significantly different.
Type 81A has a FET source follower pair followed by cascoded BJT amplifiers.
Type 81 is tube-based and has bandwidth of 33 MHz.
Type 81A is solid-state and has bandwidth of 50 MHz.


==Specifications==
The Type 81 does not have a [[547#Spoiler_Switch|spoiler switch]].
[[Category:Specifications needed]] ''please add''
The Type 81A has a spoiler switch.


==Pictures==
==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>
81.JPG|Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
Tek type 81a 1.jpg
81-2.JPG|Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
Tek type 81a 2.jpg
Type-81-schem.png|Type 81 Schematic
Tek type 81a 3.jpg
Tek 81a schematic.png|Type 81A Schematic
Tek type 81a 4.jpg
Tek type 81a 1.jpg|Type 81A
Tek type 81a 5.jpg
Tek type 81a 2.jpg|Type 81A
Tek type 81a 6.jpg
Tek type 81a 3.jpg|Type 81A
Tek type 81a 7.jpg
Tek type 81a 4.jpg|Type 81A
Tek 81a schematic.png | Type 81A Schematic
Tek type 81a 5.jpg|Type 81A
Tek type 81a 6.jpg|Type 81A
Tek type 81a 7.jpg|Type 81A
</gallery>
</gallery>
==Components==
{{Parts|81}}
{{Parts|81A}}


[[Category:580 series plugins]]
[[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 • 1L30 • 1L60 • 3L10 • 512 • 556 • 575 • 545 • 547 • 549 • 581 • 585 • A • B • C • G • K • H • L • ML • M • N • O • R • S • Z • Pentrix L20 • Pentrix L30
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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