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(D was superseded first by W, then 1A6.)
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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, ranging from 2 MHz at 50 mV/div and up, to 300 kHz at 1 mV/div.
Type D was the first high-gain plugin for the 500-series.
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
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.
six tubes, on a shock-mounted subchassis to avoid microphonics.


Type D was [[introduced in 1954|introduced]] with the [[531]] and [[535]] in [[introduced in 1954|1954]] as Type 53D.
Along with Types [[A]], [[B]], and [[C]], Type D was introduced with the [[531]] and [[535]] in [[introduced in 1954|1954]].
It was briefly renamed Type 53D/54D in 1955 with the introduction of the [[541]] and [[545]],
 
and then quickly renamed Type 53/54D.
At the time it was called Type 53D.
Its name was then shortened to Type D in 1959 with the introduction of the 5xxA scopes.
It was briefly renamed 53D/54D in 1955 with the introduction of the [[541]] and [[545]],
Its last year was 1968, having been superseded by the constant-bandwidth model [[1A6]].
and then quickly changed to 53/54D, shortening 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Its final year in the catalog was 1968; it had been superseded by Type [[W]] and then [[1A6]].


[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years.
[[K]], [[L]], and [[T]] are tied for longest production life, at 16 years.

Revision as of 16:51, 22 February 2021

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

Type D was the first high-gain plugin for the 500-series. 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, and then quickly changed to 53/54D, shortening 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 W and then 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.

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