360
The Tektronix Type 360 is the "indicator unit" of the 160 series modular scope system. It contains a 3WP CRT (T3100 for SN > 25767), 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
360 front view
360 Trace
The BNC connectors are a modification.
LHS
LHS, HV Cover off
RHS
RHS, HV Cover off
Top
Amplifiers schematic
CRT circuit
Some Parts Used in the 360
| Page | Class | Description | Used in |
|---|---|---|---|
| 12AT7 | 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 • 3A2 • 3A75 • 1M1 • A • B • C • G • H • K • L • M • N • K • R • S • Z |
| 3WP | CRT | series of flat-faced 3" mono-accelerator CRTs | 315 • 310 • 360 • Telequipment S31 |
| 5642 | 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 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 567 • 575 • 581 • 581A • 585 • 585A • 647 |
| 6AN8 | Vacuum Tube (Triode/Pentode) | triode-pentode combo | 310 • 310A • 316 • 317 • 360 • 502 • 502A • 516 • 517 • 517A • 526 • 575 • N |
| 6AQ5 | Vacuum Tube (Pentode) | beam pentode | 310 • 310A • 316 • 360 • 511A • 512 • 517 • 517A • 524 • 536 • 575 |
| 6AU6 | Vacuum Tube (Pentode) | RF pentode | 2A60 • 80 • 107 • 160 • 181 • 190 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • 535 • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 575 • 581 • 581A • 585 • 585A • C • CA • Q |
| 6BQ7A | Vacuum Tube (Dual Triode) | dual triode | 107 • 163 • 310 • 316 • 360 • 181 • 315 • 524 • 531 • 532 • 535 • 536 • 541 • 545 • T |
| 6EW6 | Vacuum Tube (Pentode) | pentode | 132 • 360 • 527 • 581 • 581A • 585 • 585A |
| T3100 | CRT | 3" CRT | 310 • 310A • 315 • 360 |