3S76: Difference between revisions
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Tek 3s76 early.jpg|Early 3S76, sn 000815 | Tek 3s76 early.jpg|Early 3S76, sn 000815 | ||
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==Parts== | |||
{{Parts|3S76}} | |||
{{Parts|3S76A}} | |||
[[Category:Sampling plugins]] | [[Category:Sampling plugins]] | ||
[[Category:560 series plugins]] | [[Category:560 series plugins]] |
Revision as of 05:44, 14 September 2023
The Tektronix 3S76 is a dual-trace sampling plug-in for 560-series scopes. The inputs have 50 Ω impedance and use GR-874 connectors. Rise time is rated at less than 0.4 ns.
The initial design work on the 3S76 was done by Cliff Moulton. It was called the Type 76, later renamed 3S76 before going into production. A decision was made to demonstrate the 76/3S76 at the 1961 IRE show. This created a panic because the plug-in was not complete. The 76 project landed in the TV group. Ron Olson and Charlie Rhodes were designing it and Walt Lowy was a technician. Phil Crosby worked on it for a week during spring break from Portland State (college then, not university). Phil Crosby designed the channel switching circuitry.
Key Specifications
Rise time | < 400 ps |
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Bandwidth | 875 MHz |
Input impedance | 50 Ω |
Triggering | Internal trigger take-off, 55 ns delay line |
Early 3S76 units are marked RT. ≈ 0.4 nSEC on the front panel. Later 3S76 units are marked RT. ≤ 0.4 nSEC on the front panel.
Internals
Each input has a trigger takeoff transformer and a 55 ns coaxial delay line. The trigger source channel is selectable.
Each delay line terminates at that channel's sampling bridge, which is a four-diode design using beam-lead GaAs diodes.
A 7586 nuvistor buffers the output of each sampling bridge. The sampling pulse, common to both channels, is generated by a 152-115 snap-off diode and a 3 cm twisted-pair clipping line.
Pictures
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front
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Sampler schematic
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Early 3S76, sn 000815
Parts
Some Parts Used in the 3S76
Part | Part Number(s) | Class | Description | Used in |
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152-115 | 152-115 • 152-0115-00 | Discrete component | step recovery diode | 3S3 • 3S76 |
2N1516 | 151-015 | Discrete component | Germanium PNP transistor | 3S76 |
2N2207 | 151-063 • 151-0063-00 | Discrete component | germanium PNP transistor | 3B1 • 3B3 • 3S76 • 321A • 547 |
6922 | 154-0195-00 | Vacuum Tube (Dual Triode) | dual triode | 3S76 • 4S2 |
6CW4 | 154-0323-00 | Vacuum Tube (Triode) | Nuvistor triode | 1A7 • 3A8 • 3B2 • 3S76 • 6R1 • 565 • S-311 |
6DJ8 | 154-0187-00 • 154-0305-00 | Vacuum Tube (Dual Triode) | dual triode | 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4 |
7308 | 154-0371-00 | Vacuum Tube (Dual Triode) | dual triode | 3S76 • 3S3 • 4S1 • 4S2A • 4S3 • S-311 |
7586 | 154-0306-00 | Vacuum Tube (Triode) | Nuvistor triode | M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A1S • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3T77 • 3T77A • 3B5 • 4S1 • 4S2 • 6R1 • 6R1A • 9A1 • 9A2 • 82 • 86 • S-311 |
RT5204 | 151-0058-00 | Discrete component | Silicon NPN transistor | 565 • RM565 • Z • 2A61 • 3B1 • 3B3 • 3S76 • 3T77 |
ZZ1000 | 154-370 • 154-0370-00 | Gas Discharge Tube (Voltage regulator) | 81 V voltage reference | 129 • 3B1 • 3B1S • 3B2 • 3B3 • 3S76 • 422 • S-311 |
Some Parts Used in the 3S76A
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