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The '''Tektronix Type D''' is a differential amplifier plug-in for [[500-series scopes]].
The '''Tektronix Type D''' is a differential amplifier plug-in for [[500-series scopes]].


It has high gain, and the bandwidth depends on the gain,
It has high gain, and the bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div and up, to 300 kHz at 1 mV/div.
ranging from 2 MHz at 50 mV/div and up, to 300 kHz at 1 mV/div.


It displays the difference between two input signals,
It displays the difference between two input signals, with a common-mode rejection ratio of 10,000.  It has
with a common-mode rejection ratio of 10,000.  It has
six tubes, on a shock-mounted subchassis to avoid microphonics.
six tubes, on a shock-mounted subchassis to avoid
microphonics.


Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in  
Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in [[introduced in 1954|1954]] as Type 53D,
[[introduced in 1954|1954]] as Type 53D,
was briefly renamed Type 53D/54D in 1955 with the introduction of the [[541]] and [[545]], then quickly renamed Type 53/54D,
was briefly renamed Type 53D/54D in 1955 with the introduction
then shortened to Type D in 1959 with the introduction of the 5xxA scopes.  Its last year was 1968, having been superseded
of the [[541]] and [[545]], then quickly renamed Type 53/54D,
by the constant-bandwidth model [[1A6]].
then shortened to Type D in 1959 with the introduction of
the 5xxA scopes.  Its last year was 1968.


[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]].
[[Lavoie Laboratories]] produced an unauthorized clone, the [[Lavoie LA-265-D]].

Revision as of 02:47, 6 August 2017

Template:Plugin Sidebar 2

The Tektronix Type D is a differential amplifier plug-in for 500-series scopes.

It has high gain, and the bandwidth depends on the gain, ranging from 2 MHz at 50 mV/div and up, to 300 kHz at 1 mV/div.

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.

Type D was introduced with the 531 and 535 in 1954 as Type 53D, 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 Its last year was 1968, having been superseded by the constant-bandwidth model 1A6.

Lavoie Laboratories produced an unauthorized clone, the Lavoie LA-265-D.

Internals

Some production runs used a pair of 5814 tubes at the input while others 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.

Specifications

please add

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)

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