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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]].


It has high gain, and the bandwidth depends on the gain,
Type D was the most sensitive plug-in of the original four.
ranging from 2MHz at 50mV/div and up, to 300kHz at 1mV/div.
The bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div to 300 kHz at 1 mV/div.
It displays the difference between two input signals,
There are two axes of sensitivity setting: a decade attenuator in front of a gain switch.
with a common-mode rejection ratio of 10,000. It has
This scheme would be reprised in Type [[W]].
six tubes, on a shock-mounted subchassis to avoid
microphonics.


Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in
It displays the difference between two input signals, with a common-mode rejection ratio of 10,000. 
[[introduced in 1954|1954]] as Type 53D,
It has six tubes, on a shock-mounted subchassis to avoid microphonics.
was briefly renamed Type 53D/54D in 1955 with the introduction
of the [[541]] and [[545]], then quickly renamed Type 53/54D,
then shortened to Type D in 1959 with the introduction of
the 5xxA scopes.  Its last year was 1968.


Some production used a pair of [[5814]] tubes at the input while others used [[12AU7]]'s.
Along with Types [[A]], [[B]], and [[C]], Type D was introduced with the [[531]] and [[535]] in [[introduced in 1954|1954]].
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.


* http://bama.edebris.com/manuals/tek/d/
At the time it was called Type 53D.
* http://w140.com/tek_fcp/tek_type_d_factory_cal_proc.pdf
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>
<gallery>
Image:D.jpeg
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>
</gallery>
==Components==
{{Parts|D}}
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]

Latest revision as of 10:31, 29 January 2024

Tektronix Type D
Differential amplifier
D front view

Compatible with 500-series scopes

Produced from 1954 to 1969

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

The Tektronix Type D is a differential amplifier plug-in for 500-series scopes. It was designed by Rodgers Jenkins.

Type D was the most sensitive plug-in of the original four. 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 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.

Key Specifications

Deflection 1 mV/Div to 50 V/Div in 1–2–5-10-20-50 sequence and 1-10-100-1000 sequence
Input impedance 1 MΩ // 47 pF (either input)
Bandwidth 2 MHz with MV/CM MULTIPLIER set to 50; 300kHz with MV/CM MULTIPLIER set to 1
CMRR 10000:1 with MILLIVOLTS/CM set to 1, 1000:1 otherwise
Signal ranges
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.

Links

Documents Referencing D

Document Class Title Authors Year Links
IBM 223-6725-2.pdf Application Note Tektronix oscilloscopes (IBM Customer Engineering Manual) 1960 310 • 310A • 531 • 531A • 535 • 535A • 545A • B • C • CA • D • G
Tekscope 1972 V4 N5 Sep 1972.pdf Article A Practical Approach to Differential Amplifiers and Measurements Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z
Tekscope 1972 V4 N6 Nov 1972.pdf Article Differential Amplifiers and Measurements, Part 2 Fred Beckett 1972 112 • 11A33 • 1A5 • 1A6 • 1A7 • 1A7A • 26A2 • 3A9 • 5A22N • 7A13 • 7A22 • AM502 • D • E • G • P6055 • P6046 • W • Z

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

  • Front

    Front

  • Chassis

    Chassis

  • Rubber support for elimination of microphonics

    Rubber support for elimination of microphonics

  • Chassis bottom

    Chassis bottom

  • Early Schematic

    Early Schematic

  • Late Schematic

    Late Schematic

  • Late Attenuators

    Late Attenuators

  • Front View (vertical position knob not original)

    Front View (vertical position knob not original)

Components

Some Parts Used in the D

Part Part Number(s) Class Description Used in
12AU7 154-041 • 154-0041-00 • 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825 • Keithley 660A
5814 154-0054-00 • 154-0316-00 Vacuum Tube (Double Triode) twin medium-μ triode D
5879 154-0055-00 Vacuum Tube (Pentode) sharp-cutoff pentode 112 • 512 • D • E • Hickok 1825
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