D: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
m (Early production not "some production")
(One intermediate revision by the same user not shown)
Line 37: Line 37:


==Internals==
==Internals==
Some production runs used a pair of [[5814]] tubes at the input while others used [[12AU7]]'s.
Early production used a pair of [[5814]] tubes at the input while late used [[12AU7]]'s.
These two tube types have different heater currents, and because the heaters are
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.
series-wired, you cannot switch from one type to the other without circuit modification.
Line 57: Line 57:
Tek d late attenuators.png|Late Attenuators
Tek d late attenuators.png|Late Attenuators
Tek type d front.jpg|Front View (vertical position knob not original)
Tek type d front.jpg|Front View (vertical position knob not original)
Tek type d left2.jpg
</gallery>
</gallery>


[[Category:500 series plugins]]
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]
[[Category:Differential amplifiers]]

Revision as of 14:50, 1 March 2021

Template:Plugin Sidebar 2

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

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 Its final year in the catalog was 1968; it had been superseded by Type W and then 1A6.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

Early production used a pair of 5814 tubes at the input while late 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