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The Tektronix Type A is a single-channel preamp [[introduced in 1959]] for [[500-series scopes]]. | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|type=Type A | |||
|summary=20 MHz amplifier plug-in | |||
|image=Tek 53 54 a.jpeg | |||
|caption=Tektronix Type 53A | |||
|series=500-series scopes | |||
|introduced=1954 | |||
|discontinued=1962 | |||
|designers=Bill Polits | |||
|manuals= | |||
* [[Media:070-214.pdf|Tektronix Type A Manual 070-214]] | |||
* [[Media:tek_manuals_type_a.pdf|Tektronix Type A Manual]] (bad-OCR) | |||
* [[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]]. | |||
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 | 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 | 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 | |||
Short Form catalog, and its | Type 53A ancestor was in the August 1954 catalog which introduced the first 500-series scopes, | ||
catalog which introduced the first 500-series scopes, the [[531]] and the [[535]] | the [[531]] and the [[535]]. | ||
Type A was the first letter-series plug-in to be discontinued, in 1962. | 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. | 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. | |||
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. | |||
==Pictures== | |||
<gallery> | <gallery> | ||
53A 1.JPG | 53A 1.JPG|53A front | ||
53A 2.JPG|53A chassis | |||
53A 3.JPG|53A chassis bottom | |||
Tek 53-54a front.jpg|53/54A front | |||
Tek 53-54a top.jpg|53/54A top (dirty, missing two tubes) | |||
Tek 53-54a bottom.jpg|53/54A bottom | |||
Tek 53-54a left.jpg|53/54A left | |||
Tek 53-54a rear.jpg|53/54A rear | |||
Tek type a 1.jpg|Type A front | |||
Tek type a schem.png|schematic | |||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|A}} | |||
[[Category:500 series plugins]] | |||