535

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The Tektronix Type 535 is a 10*/15 MHz dual-timebase oscilloscope that accepts letter-series and 1-series plug-ins.

The 535 is functionally the same as the 30-MHz 545, but with a simpler, non-distributed vertical amplifier. Early 535s came in brown, square-cornered cabinets; in 1956 the cabinet became blue and round-cornered.

Type 535, the single-timebase Type 531, and the first four plug-ins, Types 53A, 53B, 53C, and 53D, were introduced in August 1954, advertised as "... the «convertibles» of the Tektronix line". Types 541 and 545 came out in March 1955.

In 1959, Types 531, 535, 541, and 545 were superseded by Types 531A, 535A, 541A, and 545A, which have more convenient controls. In addition, Types 531A and 535A have slightly faster (15 MHz vs. 11 MHz) vertical amplifiers.

There is also a rack-mount version, Types RM35 and RM35A.

Starting in 1963, the 535A was made with BNC connectors for the external trigger inputs. Prior to 1963, the external trigger inputs used UHF connectors. 1972 was the last year that any version of the 535 was sold. In 1973, the 54x series was still available, but nothing from the 53x series.

The first 535s had brown slide-out cases, then blue slide-out cases, and finally blue cases with pop-off sides.

* With Type A or B plug-in; 11 MHz with Type K or other fast plug-in.

Key Specifications

     — 535 SN 101-8627: Double-terminated delay line
Bandwidth DC to 10 MHz (≤ 3 dB) with Type A plug-in
Rise time 0.035 μs
     — 535 SN 8268 up & 535A: Single-terminated delay line
Bandwidth DC to 15 MHz (≤ 3 dB) with Type K plug-in
Rise time 0.024 μs
     — all
Line Voltage 108/115/122/216/244 VAC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz.
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Power Consumption 500 W with Type CA plug-in
Cooling AC Fan
Trigger Modes AC/DC/AC LF Reject, and HF Sync
CRT early models, 5BGP2, part number 154-081; late models, T51; 10 kV acceleration, 6 cm × 10 cm screen
Construction Aluminum alloy chassis. Anodized front panel
Weight 65 lbs / 29.5 kg

Links

Documents Referencing 535

Document Class Title Authors Year Links
Tek rotan 500-series.pdf Article A Dynamic Angular Transducer for Oscilloscope Display of Rotation-Related Phenomena George Edens 1958
IBM 223-6725-2.pdf Application Note Tektronix oscilloscopes (IBM Customer Engineering Manual) 1960

Documents Referencing 535A

Document Class Title Authors Year Links
IBM 223-6725-2.pdf Application Note Tektronix oscilloscopes (IBM Customer Engineering Manual) 1960

Special Models

Three "special models" of 535 were made:

  • 535-S1 (sweep delay 10 microseconds to 1 second)
  • 535-S2 (sweep delay 100 microseconds to 10 seconds)
  • 535-S6 (sweep delay 1.5 microseconds to 10 seconds)

The delaying timebase on the standard non-A 535 supports delays up to 100 milliseconds. The 535-S1 supports delays up to 1 second, the 535A up to 10 seconds.

From ServiceScope No.1, October 1959:

In Type 535 and 545 the total delaying sweep time is limited to 10 ms/cm. If a total delaying sweep time in excess of 10 ms/cm is required, a K535-S1 modification kit (Tek #040-063) which gives a maximum delay sweep range of 1 s/cm. This kit is available for $40.00 in including a new front panel.

Internals

Triggering is done with a Schmitt trigger made of a 6U8 tube (in early instruments) or a 6DJ8 tube (in late instruments).

Early 535s had selenium rectifiers. The 535 has a thermal cutoff.

Power Supply

The 535's power supply provides regulated outputs of −150V, +100V, +225V, +350V, +500V as well as a +325 V unregulated output for CRT HV section.

The Power supply section is very similar to a 549. It is an all tube design using

5651 as Voltage reference
12AX7 as comparator
12B4 as -150V series pass element
6080 as +100V, +225V and +350V series pass element
12B4 as +500V series pass element
6AU6 as error amplifier for all rails

Links

Pictures

535

RM 35

535 S1

535 S2

535A

535A Internals

RM35A

RM35AR


Some Parts Used in the 535

Part Part Number(s) Class Description Used in
120-086 120-086 Discrete component power transformer 535
12AU7 154-041 154-0041-00 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 104A 122 160 161 162 181 190 310 310A 316 317 3C66 502 502A 507 511A 512 516 517 517A 524 526 535 536 545 545A 545B 547 549 555 561 564 570 575 581 581A 585 585A C D E N Q Hickok 1825
12AX7 154-043 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 513 524 531 531A 535 536 545 545A 545B 546 547 549 555 570 581 581A 585 585A E Q Hickok 1825
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A
12BY7A 154-047 154-0047-00 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 163 524 531 533 535 536 541 543 535 545 545A 549 555 75 3A75 3B5
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 533 533A 535 536 543 543A 543B 545 545A 545B 547 551 555 556 560 561 561A 561S 564 567 570 575 581 581A 585 585A 647 647A
5651 154-052 154-0052-00 154-0288-00 Gas Discharge Tube (Voltage regulator) 87 V voltage reference 128 160 310 310A 502 503 504 511A 512 516 517 524 526 531 531A 535 536 541 541A 543 543A 543B 545 545A 545B 570 549 581 581A 585 585A
5BG 154-0080-00 154-0081-00 154-0082-00 154-0083-00 154-0124-00 CRT series of 5" CRTs 513 531 535
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6197 154-0146-00 Vacuum Tube (Pentode) 7.5 W power pentode 516 531 533 535 535A 547 556 75 3A75
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6AU5 154-021 154-0021-00 Vacuum Tube (Pentode) 10 W beam power pentode 507 513 516 517 517A 531 535 541 535 545 547 581 581A 585 585A
6AU6 154-0022-00 157-0073-00 157-0059-00 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 160 181 190 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 535 536 545 545A 546 547 549 555 561 561A 561S 564 565 567 570 575 581 581A 585 585A 80 C CA Q
6AW8 154-0095-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 132 160 541 535 545
6BQ7A 154-028 154-0028-00 157-0022-00 157-0003-00 Vacuum Tube (Dual Triode) dual triode 107 163 181 310 315 316 360 524 531 532 535 536 541 545 570 T
6CB6A 154-0030-00 Vacuum Tube (Pentode) pentode 105 112 316 317 503 504 513 517 517A 541 535 545 63 2A63
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 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
6DK6 154-0149-00 154-0367-00 Vacuum Tube (Pentode) high-frequency miniature pentode 180 503 513 514 541 543 535 545 545A 551 555
6U8 154-0033-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 130 160 163 310 315 316 524 535 545 T
T51 154-0080-00 154-0081-00 154-0082-00 154-0083-00 154-0092-00 154-0096-00 154-0101-00 154-0117-00 154-0121-00 154-0123-00 154-0124-00 154-0117-00 154-0150-00 154-0197-00 154-0342-00 154-0379-00 CRT 5" CRT 513 531 535


Some Parts Used in the 535A

Part Part Number(s) Class Description Used in
12B4 154-044 154-0044-00 Vacuum Tube (Triode) power triode 126 310 310A 316 317 502 502A 524 526 541 541A 535 535A 545 545A 546 547 570 549 551 555 513 581 581A 585 585A
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
6197 154-0146-00 Vacuum Tube (Pentode) 7.5 W power pentode 516 531 533 535 535A 547 556 75 3A75
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D56 Telequipment S52
6CL6 154-031 154-0031-00 154-0286-00 Vacuum Tube (Pentode) 7.5 W power pentode 132 310 310A 316 317 515 524 525 531 535 535A 545 545A 545B 549 570 581 581A 585 585A 3A74
T5330 154-0178-00 154-0165-00 154-0179-00 154-0180-00 154-0350-00 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A


Some Parts Used in the RM35


Some Parts Used in the RM35A

Part Part Number(s) Class Description Used in
6080 154-0056-00 154-0315-00 Vacuum Tube (Dual Triode) dual power triode 132 160 316 317 516 535 535A RM35A 541 541A 535 536 545 545A 545B 546 547 549 565 567 575 581 581A 585 585A
T5330 154-0178-00 154-0165-00 154-0179-00 154-0180-00 154-0350-00 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A