C
- Actually, there never was a Type C, but that name is sometimes used as shorthand for the official "Type 53C" and "Type 53/54C" nomenclatures.
The Type C was designed by Rodgers Jenkins.
The Tektronix Type 53C is a dual-trace plug-in for 500-series scopes. It was introduced along with the 531 and 535 mainframes in 1954. It is very possibly the first dual-trace scope or plugin ever. Unlike the Type A and Type B, the Type C had the ability to invert the signal before display.
Type 53C was replaced by Type 53/54C in 1956 when the 541 and 545 were introduced. The Type 53/54C's bandwidth is 24 MHz in those scopes. In 1959 it was replaced by the Type CA.
Key Specifications
| Bandwidth | 24 MHz (53/54C in a 545) |
|---|---|
| Rise time | ≤15 ns (53/54C in a 545) |
| Deflection | 50 mV/Div to 20 V/Div, 1–2–5 |
| Input impedance | 1 MΩ // 20 pF |
53C Specifications
In the 53x scopes (Tek never documented its performance in the 540's), its bandwidth is 8.5 MHz, and like most letter-series plug-ins, its maximum vertical sensitivity is 50 mV/div.
Links
Documents Referencing C
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| IBM 223-6725-2.pdf | Application Note | Tektronix oscilloscopes (IBM Customer Engineering Manual) | 1960 | 310 • 310A • 531 • 531A • 535 • 535A • 545A • B • C • CA • D • G | |
| Service Scope 12 Feb 1962.pdf | Article | Field Modification Kits | 1962 | 551 • 020-224 • 531 • 535 • 541 • 545 • 040-200 • 531A • 535A • 541A • 545A • 040-198 • 502 • 040-209 • Type 53C • Type 53/54C • C • CA |
Internals
At 15 tubes, the Type 53/54C and Type CA have the highest tube count of any letter-series plug-in. Each channel consists of a 6AK5 cathode-follower driving a 12AU6 differential pair which drives a 6AU6 differential pair. The two channels converge on a 12AT7 cross-coupled cathode-follower. Four more tubes, a 6AL5 and three 12AT7's, comprise a logic circuit which determines which channel drives the output at any given moment. The options are A, B, CHOPPED, and ALT.
Links
Pictures
53C
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53C-Plugin´s Front
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53C-Plugin´s chassis
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53C-Plugin´s chassis side
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Early 53C, serial number 140
53/54C
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53/54C-Plugin´s front
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53/54C-Plugin´s chassis
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53/54C-Plugin´s chassis bottom
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53/54C Schematic diagram
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53/54C
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53/54C
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53/54C
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53/54C
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53/54C
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53/54C
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53/54C
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53/54C
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Gray 53/54C with sideways labeling
