535

Manuals – Specifications – Links – Pictures

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In 1959, Types 531, 535, 541, and 545 were superseded by Types 531A, 535A, 541A, and 545A, which have more convenient controls.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

Key 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

• Comparison of Tektronix 535, 535A, and HP 150A with detailed pictures
• Tektronix 535A - Restoring a Swap Meet Find
• 120-086 Power transformer schematic

Pictures

535

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  535 with brown case

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  535 with brown case

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  535 with brown case

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  535 with brown case

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  535 with brown case

535 S1

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  535 S1

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  535 S1

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  535 S1

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  535 S1

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  535 S1

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  535 S1

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  535 S1

535 S2

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  535-S2

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  535-S2

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  535-S2

535A

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  535A

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  vertical amplifier

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  535A delay line

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  535A delay line

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  535A trace

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  535A

RM35A

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  R35A front

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  R35A trigger controls

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  RM35A HV Section

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  RM35A B intensified by A Trace

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  RM35A Internals

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  RM35A Internals

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  RM35A trace

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  RM35A rear

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  RM35A rear

RM35AR

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  RM35AR (mod 116B)

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  RM35AR (mod 116B)

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  RM35AR (mod 116B)

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  RM35AR (mod 116B)

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  RM35AR (mod 116B)