360
The Tektronix Type 360 is the "indicator unit" of the 160 series modular scope system. It contains a 3WP CRT (T3100 for SN > 2682), vertical amplifier, horizontal amplifier, and HV CRT circuit. It does not contain the low-voltage power supply, which is a separate component in the 160 system.
Internals
Vertical Signal Path
The vertical signal path starts with a switched compensated attenuator, followed by a 6AU6 differential amplifier stage, followed by a second 6AU6 differential stage.
Horizontal Signal Path
The horizontal amplifier uses a 6AN8 common-cathode gain stage followed by a 6AU6 common-cathode amplifier as a phase splitter to differentially drive the CRT horizontal deflection plates.
CRT Circuit
The CRT circuit in the Type 360 uses a 6AQ5-based power oscillator to drive two 5642 high-voltage rectifier tubes, one for the CRT grid voltage, and one for the CRT cathode voltage. The high-voltage regulator feedback amplifier is made from two cascaded common-cathode amplifiers, each made from one half of a 12AT7 dual triode.A high voltage isolation transformer (1:1) is used to power the CRT filament from the main 6.3V heater line.
Mechanical
Open-frame construction allows the 360 to operate without fan cooling. 360s with SN < 1000 were made using printed circuit boards, later SN are made using the ceramic wiring strip style that is more typical of the 1950s and 1960s Tektronix construction.
Pictures
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360 front view
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360 Trace
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The BNC connectors are a modification.
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LHS
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LHS, HV Cover off
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RHS
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RHS, HV Cover off
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Top
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Amplifiers schematic
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CRT circuit
Components
Some Parts Used in the 360
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 12AT7 | 154-0039-00 | Vacuum Tube (Dual Triode) | dual high-gain triode | 161 • 180 • 310 • 310A • 315 • 316 • 360 • 502 • 502A • 511A • 512 • 513 • 513D • 514 • 514AD • 514D • 516 • 524 • 529 • RM529 • 544 • 546 • 547 • 556 • 565 • 570 • 3A2 • 75 • 3A75 • 1M1 • A • B • C • G • H • K • L • ML • M • N • K • R • S • Z • Keithley 610B • Pentrix L20 • Pentrix L30 |
| 3WP | 154-0059-00 | CRT | series of flat-faced 3" mono-accelerator CRTs | 315 • 310 • 360 • Telequipment S31 |
| 5642 | 154-0051-00 • 154-0079-00 | Vacuum Tube (Diode) | directly-heated high-voltage rectifier | 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 531A • RM31A • 532 • 533 • 533A • 535 • 535A • RM35A • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A |
| 6AN8 | 154-078 • 154-0078-00 | Vacuum Tube (Triode/Pentode) | triode-pentode combo | 310 • 310A • 316 • 317 • 360 • 502 • 502A • 516 • 517 • 517A • 526 • 532 • 565 • 570 • 575 • N |
| 6AQ5 | 154-017 • 154-0017-00 | Vacuum Tube (Pentode) | beam pentode | 310 • 310A • 316 • 360 • 507 • 511A • 512 • 517 • 517A • 524 • 532 • 536 • 570 • 575 |
| 6AU6 | 154-0022-00 • 157-0073-00 • 157-0059-00 • 154-0284-00 | Vacuum Tube (Pentode) | RF pentode | 107 • 129 • 160 • 181 • 190 • 60 • 2A60 • 72 • 3A72 • 3C66 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 506 • 511 • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • RM31A • 532 • 535 • 535A • RM35A • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 561 • 561A • 561S • 564 • 565 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 80 • C • CA • Q |
| 6BQ7A | 154-028 • 154-0028-00 • 157-0003-00 • 157-0022-00 | Vacuum Tube (Dual Triode) | dual triode | 107 • 163 • 181 • 310 • 315 • 316 • 360 • 524 • 531 • 532 • 535 • 536 • 541 • 545 • 570 • T |
| 6EW6 | 154-0212-00 | Vacuum Tube (Pentode) | pentode | 106 • 132 • 360 • 51 • 527 • 581 • 581A • 585 • 585A • 3T77 • 3T77A |
| T3100 | 154-0362-00 • 154-0363-00 • 154-0364-00 • 154-0365-00 • 154-0366-00 • 154-0058-01 • 154-0059-01 • 154-0060-01 • 154-0061-01 | CRT | 3" CRT | 310 • 310A • 315 • 360 |