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{{Plugin Sidebar|
{{Plugin Sidebar 2 |
title=Tektronix Type 81|
title=Tektronix Type 81|
summary=Plugin Adapter|
summary=Plugin Adapter|
image=81.JPG |  
image=81.JPG |  
caption=Type 81 front view|
caption=Type 81 front view|
years=? – ? |
introduced=1960 |
discontinued=1972 |
type=Adapter|
type=Adapter|
series=[[580-series scopes]]|
series=[[580-series scopes]]|
manuals=
manuals=
* [http://w140.com/tek-81.pdf Tektronix Type 81 Manual (PDF)]
* [[Media:070-232.pdf|Tektronix Type 81 Manual]] (PDF)
* [http://w140.com/tek-81a.pdf Tektronix Type 81A Manual (PDF)]
* [[Media:070-0751-00.pdf|Tektronix Type 81A Manual]] (PDF)
* [http://w140.com/tek_fcp/tek_type_81_factory_cal_proc.pdf Tektronix Type 81 Factory Calibration Procedure (PDF)]
<small>
'''Factory Calibration Procedures'''
* [http://w140.com/tek_fcp/tek_type_81_factory_cal_proc.pdf Type 81 FCP] (PDF)
* [[Media:Tek 81a fcp may 1967.pdf|Type 81A FCP]] (PDF)
</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 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
of a 530-, 540-, or 550-series scope.  The second stage of the Type 81 is a
cathode-follower, which drives the 580-series scope using a low impedance, as
is required by 580-series scopes.


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


==Specifications==
==Specifications==
[[Category:Specifications needed]] ''please add''
[[Category:Specifications needed]] ''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 [[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==
==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 1.jpg|Type 81
Tek 81 2.jpg|Type 81
Tek 81 3.jpg|Type 81
Tek 81 4.jpg|Type 81
Tek 81 5.jpg|Type 81
Tek 81 6.jpg|Type 81
Tek 81 7.jpg|Type 81
Tek 81 8.jpg|Type 81
</gallery>
==Type 81A==
<gallery>
<gallery>
File:81.JPG|Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
Tek type 81a 1.jpg|Type 81A
File:81-2.JPG|Type 81 with a [[1A2]] in a Netherlands-made [[585|585A]]
Tek type 81a 2.jpg|Type 81A
Image:Type-81-schem.png
Tek type 81a 3.jpg|Type 81A
Tek type 81a 4.jpg|Type 81A
Tek type 81a 5.jpg|Type 81A
Tek type 81a 6.jpg|Type 81A
Tek type 81a 7.jpg|Type 81A
Tek 81a schematic.png|Type 81A Schematic
</gallery>
</gallery>


[[Category:580 series plugins]]
[[Category:580 series plugins]]

Revision as of 08:42, 22 January 2021

Template:Plugin Sidebar 2 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.

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 81A