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The Tektronix Type 82 is a dual-trace plug-in for the [[580-series scopes]]. | {{Plugin Sidebar 2| | ||
The Type 82 combined with a [[585]] or 585A provides a 4 nanosecond risetime. | title=Tektronix Type 82 | | ||
The front end of the Type 82 | summary=85 MHz Dual trace amplifier | | ||
followed by bipolar diff-amps and diode channel switching, | image=Tek_82_early_front.jpg | | ||
followed by a distributed output amplifier made of three [[6DJ8]] tubes, | caption=Type 82 front view (earlier style) | | ||
with differential | introduced=1962 | | ||
discontinued=1972 | | |||
series=[[580-series scopes]]| | |||
manuals= | |||
* [http://w140.com/tek-82.pdf Tektronix Type 82 Manual (PDF)] | |||
}} | |||
The '''Tektronix Type 82''' is a dual-trace plug-in for the [[580-series scopes]]. | |||
The Type 82 combined with a [[585]] or 585A provides a 4 nanosecond risetime (85 MHz bandwidth). | |||
{{BeginSpecs}} | |||
{{Spec | Rise time | 4 ns in ×1 mode, 4.3 ns in ×10 mode (in [[585]] mainframe) }} | |||
{{Spec | Bandwidth | 85 MHz in ×1 mode, 80 MHz in ×10 mode (in [[585]] mainframe); 70 MHz/66 MHz, respectively, with [[P6008]] probe }} | |||
{{Spec | Deflection | 50 V/Div to 100 mV/Div in ×1 mode, 5 V/Div to 10 mV/Div in ×10 mode (1-2-5) }} | |||
{{EndSpecs}} | |||
==Internals== | |||
The front end of the Type 82 has three versions, depending on serial number range. | |||
In all versions, the signal path starts with a [[7586]] [[nuvistor]] cathode-follower, followed by bipolar diff-amps | |||
and diode channel switching, followed by a [[distributed amplifier|distributed output amplifier]] made | |||
of three [[6DJ8]] tubes, with differential 93 Ω outputs. | |||
The use of a distributed amplifier in a plug-in is unusual. | The use of a distributed amplifier in a plug-in is unusual. | ||
Note that the 58x series differs from [[500-series scopes]] mainly in that | Note that the 58x series differs from [[500-series scopes]] mainly in that the vertical | ||
the vertical signal interface between the plug-in and the mainframe is | signal [[580 Series plug-in interface|interface between the plug-in and the mainframe]] | ||
a low controlled impedance (93 ohms), as opposed to other 500-series scopes | is a low controlled impedance (93 ohms), as opposed to other 500-series scopes | ||
that present a high impedance to the plug-in. | that present a high impedance to the plug-in. | ||
[[Stan Griffiths]] wrote: | |||
<blockquote> | |||
If you feed [a fast risetime] signal into an early type 82, you will | |||
find that the top three least sensitive positions have really terrible frequency | |||
response ... so bad, in fact, that some customers thought they were broken. | |||
When told this was normal, these customers wondered why Tek ever included them | |||
on the plugin. The answer was that they were still useful for low frequency | |||
signals ... but Tek never really made it well known that these 82 attenuator | |||
positions were lousey. I think this was fixed on the later 82's as Tek learned | |||
how to make better attenuators. If you have an early 82 and need to look at | |||
high frequency signals on the less sensitive ranges, the answer is to get ×100 | |||
probes and use them on the more sensitive ranges where the frequency response is | |||
better. | |||
</blockquote> | |||
The [[P6008]] voltage probe was designed for use with the Type 82. | |||
The [[585]] manual warns that for proper performance with the 82 and higher-numbered plug-ins, 585 non-A scopes with serial numbers before 2585 should have the back termination of the final distributed amplifier output modified to the later circuit (modification 040-275). | |||
==Prices== | |||
{| class="wikitable" | |||
|- | |||
! Year | |||
! 1965 | |||
! 1969 | |||
! 1971* | |||
|- | |||
! Type 82 | |||
|align=right| $650 | |||
|align=right| $695 | |||
|align=right| $925 | |||
|- | |||
! 2020 value | |||
|align=right| $5,340 | |||
|align=right| $4,900 | |||
|align=right| $5,910 | |||
|} | |||
: ''* "Limited demand" instrument | |||
==Pictures== | |||
<gallery> | <gallery> | ||
Tek_82_early_front.jpg | Front view, early style | |||
Tek 82 1d.JPG | Front view, later style | |||
Tek-585-82.jpg | Early type 82 in [[585]] mainframe | |||
Tek-82-left.jpg | Left side | |||
Tek-82-right.jpg | Right side | |||
Tek82-input-1.jpg | Detail of input section | |||
Tek82-input-2.jpg | Detail of input section | |||
82_front.jpg | Front view, early style | |||
82_left.jpg | Left view | |||
82_top.jpg | Top view | |||
82_right.jpg | Right view | |||
Type 82 top.jpg | |||
Type 82 rear.jpg | |||
Type 82 leftb.jpg | |||
Type 82 bottom.jpg | |||
Type 82 distamp bottom.jpg | Bottom of distributed amplifier | |||
Type 82 distamp top.jpg | Top of distributed amplifier | |||
Type 82 front.jpg | |||
Tek 82 late input schematic.png|Input schematic for late serial numbers | |||
Tek 82 x10 amplifiers schematic.png|x10 amplifiers schematic | |||
Tek 82 switching and output schematic.png|Switching and output schematic | |||
</gallery> | </gallery> | ||
[[Category:580 series plugins]] |