D: Difference between revisions

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Image:D 3.JPG| Rubber support for mircophone-elimination
Image:D 3.JPG| Rubber support for mircophone-elimination
Image:D 4.JPG| Chassis bottom
Image:D 4.JPG| Chassis bottom
File:Tek d early schem.png|Early Schematic
File:Tek d late schem.png|Late Schematic
File:Tek d late attenuators.png|Late Attenuators
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Revision as of 21:18, 1 May 2014

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

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

Some production 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.