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manuals=
manuals=
* [http://bama.edebris.com/manuals/tek/a/ Tektronix Type A Manual (PDF)]
* [http://bama.edebris.com/manuals/tek/a/ Tektronix Type A Manual (PDF)]
* [http://w140.com/tek_fcp/tek_type_a_factory_cal_proc.pdf Tektronix Type A Factory Calibration Procedure (PDF)]
<!-- * [http://w140.com/tek_fcp/tek_type_a_factory_cal_proc.pdf Tektronix Type A Factory Calibration Procedure (PDF)] -->
* [[Media:tek_manuals_type_a.pdf|Tektronix Type A Manual (PDF, OCR, bad-OCR)]]
* [[Media:tek_type_a_fcp.pdf|Tektronix Type A Factory Calibration Procedure (PDF, OCR)]]
* [[Media:Tek 53a cal outline.pdf|Tektronix Type A Calibration Outline (PDF, OCR)]]
}}
}}
The '''Tektronix Type A''' is a single-channel preamp [[introduced in 1959]] for [[500-series scopes]].
The '''Tektronix Type A''' is a single-channel preamp [[introduced in 1959]] for [[500-series scopes]].
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The second stage drives the output stage, a pair of cathode followers made of both halves of  
The second stage drives the output stage, a pair of cathode followers made of both halves of  
a [[12AT7]] tube.  The plate of each output tube is connected to the cathode of the other output
a [[12AT7]] tube.  The plate of each output tube is connected to the cathode of the other output
tube by a 5 nF capacitor.  This "cross-coupling" extends the high-frequency response.
tube by a 5 nF capacitor.  This "cross-bootstrapping" extends the high-frequency response.


Although 1959 was the first year one could find a "Type A" in the catalog, the same
Although 1959 was the first year one could find a "Type A" in the catalog, the same
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Tek 53-54a rear.jpg|53/54A rear
Tek 53-54a rear.jpg|53/54A rear
Tek type a 1.jpg|Type A front
Tek type a 1.jpg|Type A front
File:Tek type a schem.png|schematic
Tek type a schem.png|schematic
</gallery>
</gallery>




[[Category:500 series plugins]]
[[Category:500 series plugins]]

Revision as of 17:49, 25 June 2021

Template:Plugin Sidebar 2 The Tektronix Type A is a single-channel preamp introduced in 1959 for 500-series scopes. It provides two inputs and has a switch to select between them. A 545 with a Type A has a system risetime of 18 nanoseconds and a bandwidth of 20 MHz.

The plug-in uses a 12AU6 in the front end as a cathode follower. This input stage drives the second stage, a differential amplifier made of two more 12AU6 tubes. The second stage drives the output stage, a pair of cathode followers made of both halves of a 12AT7 tube. The plate of each output tube is connected to the cathode of the other output tube by a 5 nF capacitor. This "cross-bootstrapping" extends the high-frequency response.

Although 1959 was the first year one could find a "Type A" in the catalog, the same instrument with earlier "Type 53/54A" nomenclature was in the August 1956 Short Form catalog, and its slower Type 53A ancestor was in the August 1954 catalog which introduced the first 500-series scopes, the 531 and the 535. Type 53A has only three tubes, and a bandwidth of 10 MHz in the 530 mainframes. Tek never documented its performance in the 540 mainframes.

Type A was the first letter-series plug-in to be discontinued, in 1962. Customers were told to get Type B instead, although it cost more.

Specifications

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Pictures