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* [[Media:tek_manuals_type_a.pdf|Tektronix Type A Manual (PDF, OCR, bad-OCR)]] | * [[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_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)]] | |||
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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]]. |
Revision as of 18:00, 3 May 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-coupling" 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
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53A front
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53A chassis
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53A chassis bottom
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53/54A front
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53/54A top (dirty, missing two tubes)
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53/54A bottom
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53/54A left
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53/54A rear
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Type A front
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schematic