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{{Plugin Sidebar | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
summary=20 MHz amplifier plug-in | | |type=Type A | ||
image= | |summary=20 MHz amplifier plug-in | ||
caption=Tektronix Type 53A | | |image=Tek 53 54 a.jpeg | ||
series= | |caption=Tektronix Type 53A | ||
introduced=1954 | | |series=500-series scopes | ||
discontinued=1962 | | |introduced=1954 | ||
manuals= | |discontinued=1962 | ||
* [ | |designers=Bill Polits | ||
|manuals= | |||
* [[Media:tek_manuals_type_a.pdf|Tektronix Type A Manual ( | * [[Media:070-214.pdf|Tektronix Type A Manual 070-214]] | ||
* [[Media:tek_type_a_fcp.pdf|Tektronix Type A Factory Calibration Procedure ( | * [[Media:tek_manuals_type_a.pdf|Tektronix Type A Manual]] (bad-OCR) | ||
* [[Media:Tek 53a cal outline.pdf|Tektronix Type A Calibration Outline ( | * [[Media:tek_type_a_fcp.pdf|Tektronix Type A Factory Calibration Procedure]] (OCR) | ||
* [[Media:Tek 53a cal outline.pdf|Tektronix Type A Calibration Outline]] (OCR) | |||
<small> | |||
'''Alternate copies''' | |||
* [http://bama.edebris.com/manuals/tek/a/ Tektronix Type A Manual] (PDF @ BAMA) | |||
</small> | |||
}} | }} | ||
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]]. | ||
It provides two inputs and has a switch to select between them. | 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. | A [[545]] with a Type A has a system risetime of 18 nanoseconds and a bandwidth of 20 MHz. It was designed by [[Bill Polits]]. | ||
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 | |||
Type 53A ancestor was in the August 1954 catalog which introduced the first 500-series scopes, | |||
the [[531]] and the [[535]]. | |||
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. | |||
{{MissingSpecs}} | |||
Bandwidth is 10 MHz in the 530 mainframes. | |||
Catalogs don't list 53A performance in the 540 mainframes. The Factory Cal Procedure says 20 MHz, but this is wrong. (A Type 53A's measured 3 dB point was around 17 MHz while a Type A made 23 MHz. Furthermore, the front-panel artwork reads ".017 usec" for 53A and .015 for A.) | |||
==Internals== | |||
Type 53A has only three tubes, and no [[T-coil peaking|T-coils]]. | |||
The plug-in uses a [[12AU6]] in the front end as a cathode follower. | 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. | 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 | 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-bootstrapping" extends the high-frequency response. | tube by a 5 nF capacitor. This "cross-bootstrapping" extends the high-frequency response. | ||
==Pictures== | ==Pictures== | ||
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</gallery> | </gallery> | ||
==Components== | |||
{{Parts|A}} | |||
[[Category:500 series plugins]] | [[Category:500 series plugins]] |