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The Tektronix Type D is a plug-in for [[500-series scopes]].
{{Plugin Sidebar
|manufacturer=Tektronix
|series=500-series scopes
|type=Type D
|summary=Differential amplifier
|image=Tek type d front.jpg
|caption=D front view
|introduced=1954
|discontinued=1969
|designers=Rodgers Jenkins
|manuals=
* [[Media:070-228.pdf|Tektronix Type D Manual]] (bad-OCR)
* [[Media:tek_type_d_fcp.pdf|Tektronix Type D Factory Calibration Procedure]] (OCR)
* [[Media:Tek type d cal outline.pdf|Tektronix Type D Calibration Outline]] (OCR)
<!-- * [http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf Cal procedure]
* [http://bama.edebris.com/manuals/tek/d/ Type D manual @ BAMA] -->
}}
The '''Tektronix Type D''' is a differential amplifier plug-in for [[500-series scopes]].
It was designed by [[Rodgers Jenkins]].


* http://bama.edebris.com/manuals/tek/d/
Type D was the most sensitive plug-in of the original four.
* http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf
The bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div to 300 kHz at 1 mV/div.
There are two axes of sensitivity setting: a decade attenuator in front of a gain switch.
This scheme would be reprised in Type [[W]].
 
It displays the difference between two input signals, with a common-mode rejection ratio of 10,000. 
It has six tubes, on a shock-mounted subchassis to avoid microphonics.
 
Along with Types [[A]], [[B]], and [[C]], Type D was introduced with the [[531]] and [[535]] in [[introduced in 1954|1954]].
 
At the time it was called Type 53D.
It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]].  This quickly changed to 53/54D, and finally shortened to just "D" in 1959 with the introduction of the 5xxA scopes.
Its final year in the catalog was 1968; it had been superseded by Type [[1A6]].
 
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years.
[[B]], [[D]], and [[G]] are next at 15 years.
 
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]].
 
{{BeginSpecs}}
{{Spec | Deflection | 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
{{Spec | Bandwidth | 2 MHz with MV/CM MULTIPLIER set to 50;  300kHz with MV/CM MULTIPLIER set to 1 }}
{{Spec | CMRR | 10000:1 with MILLIVOLTS/CM set to 1, 1000:1 otherwise }}
{{Spec | Signal ranges | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Range
! Common mode dynamic range*
|-
| MILLIVOLTS/CM = 1 || ±2.5 V
|-
| MILLIVOLTS/CM = 10 || ±25 V
|-
| MILLIVOLTS/CM = 100 || ±250 V
|-
| MILLIVOLTS/CM = 1000 || ±500 V
|-
|}
* In practice, Type D behaves well up to about +/–15V if the CM signal is either a brief excursion or a constant.  If the CM varies slowly, DC shift in the input tubes will degrade CMRR.
{{EndSpecs}}
 
==Links==
{{Documents|Link=D}}
 
==Internals==
Instruments below serial number 3462 used a pair of [[5814]] tubes at the input; later production used [[12AU7]]'s.
These two tube types have different heater currents, and because the heaters are series-wired, you cannot switch from one type to the other without circuit modification.
 
==Pictures==
 
<gallery>
D.jpeg
D 1.JPG|Front
D 1.JPG.JPG| Chassis
D 3.JPG| Rubber support for elimination of microphonics
D 4.JPG| Chassis bottom
Tek d early schem.png|Early Schematic
Tek d late schem.png|Late Schematic
Tek d late attenuators.png|Late Attenuators
Tek type d front.jpg|Front View (vertical position knob not original)
</gallery>
 
==Components==
{{Parts|D}}
 
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]
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