535

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

There are two timebases, and triggering is done with a Schmitt trigger made of a 6U8 tube (in early instruments) or a 6DJ8 tube (in late instruments). The delaying timebase on the 535 (non-A) supports delays up to 100 milliseconds. The 535-S1 supports delays up to 1 second. The 535A supports delays up to 10 seconds.

The 535 is functionally the same as a 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. Early 535s had selenium rectifiers. The 535 has a thermal cutoff.

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.

The 535's CRT is Tektronix part number 154-081.

In 1959, Types 531, 535, 541, and 545 were superseded by Types 531A, 535A, 541A, and 545A, which have more convenient controls.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.

From the October 1959 issue of TekScope:

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.

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

Specifications

     — 535 SN 101-8627
Bandwidth DC to 10 MHz (≤ 3 dB) with Type A plug-in
Rise time 0.035 μs
     — 535 SN 8268 up & 535A
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
Anode Potential 10 kV
Screen Area 6 cm × 10 cm
Construction Aluminum alloy chassis. Anodized front panel
Weight 65 lbs / 29,5 kg

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)

Internals

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 the following types


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

RM35A

RM35AR


Some Parts used in the 535

Page Class Description Used in
12AU7 Vacuum Tube (Double Triode) twin medium-μ triode 122 181 502 502A 512 535 545 545A 545B 547 549 555 575 581 581A 585 585A C D
12AX7 Vacuum Tube (Double Triode) dual triode 513 531 531A 535 545 545A 545B 546 547 549 555 581 581A 585 585A E
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
12BY7 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 531 533 535 536 541 543 535 545 545A 549 555
5642 Vacuum Tube (Diode) directly-heated high-voltage rectifier 360 453 502 502A 504 506 513 515 516 533 533A 535 543 543A 543B 545 545A 545B 547 551 555 556 567 575 581 581A 585 585A 647
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6197 Vacuum Tube (Pentode) sharp-cutoff pentode 516 531 533 535 535A 556
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6AU5 Vacuum Tube (Pentode) 10 W beam power pentode 513 531 535 541 535 545 581 581A 585 585A
6AU6 Vacuum Tube (Pentode) RF pentode 107 181 310 502 502A 512 513 531 531A 535 545 545A 546 547 549 555 575 581 581A 585 585A C CA
6AW8 Vacuum Tube (Triode/Pentode) triode-pentode combo 132 541 535 545
6BQ7A Vacuum Tube (Double Triode) dual triode 107 181 315 524 531 532 535 541 545
6CB6 Vacuum Tube (Pentode) pentode 105 112 513 517 541 535 545
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
6DJ8 Vacuum Tube (Double Triode) dual triode 132 502 502A 503 504 515 516 519 533 535 543 544 545 545A 545B 546 547 549 555 556 565 581 581A 585 585A 661 2A60 2A63 3A8 1121 1A4 67 81 82 86 3B1 3B4 O Telequipment S32A Telequipment D52 Telequipment S52 Telequipment S51 Telequipment Type A
6DK6 Vacuum Tube (Pentode) high-frequency miniature pentode 180 503 513 514 541 543 535 545 545A 551 555
6U8 Vacuum Tube (Triode/Pentode) triode-pentode combo 130 535 545
T51 CRT 5" CRT 513 531 535


Some Parts used in the 535A

Page Class Description Used in
12B4 Vacuum Tube (Triode) power triode 126 502 502A 541 541A 535 535A 545 545A 546 547 549 551 555 513 581 581A 585 585A
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
6197 Vacuum Tube (Pentode) sharp-cutoff pentode 516 531 533 535 535A 556
6AL5 Vacuum Tube (Double Diode) high-perveance dual diode 181 316 317 502 502A 511 511A 516 535 535A 545 545A 549 581 581A 585 585A 551 Telequipment S52
6CL6 Vacuum Tube (Pentode) miniature power pentode 132 515 524 525 531 535 535A 545 545A 545B 549 581 581A 585 585A 3A74
T5330 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A


Some Parts used in the RM35

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Some Parts used in the RM35A

Page Class Description Used in
6080 Vacuum Tube (Double Triode) twin power triode 132 535 535A RM35A 541 541A 535 545 545A 545B 546 547 549 575 581 581A 585 585A
T5330 CRT 5" CRT RM31A RM33 RM33A RM35A 531A 533 533A 535A