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The Tektronix Type 535 is a 10MHz* oscilloscope that accepts [[letter-series and 1-series plug-ins]].
{{Oscilloscope Sidebar
There are two timebases, and triggering is done with a Schmitt trigger made of a [[6U8]] tube (in
|manufacturer=Tektronix
early instruments) or a [[6DJ8]] tube (in late instruments).
|series=500-series scopes
The 535 is functionally the same as a [[545]],
|model=535
but with a simpler, non-distributed vertical amplifier.
|summary=10 (15) MHz dual-timebase scope
Early 535s came in brown, square-cornered cabinets;
|image=Tek-535a-crop.jpg
in 1956 the cabinet became blue and round-cornered.
|caption=Tektronix 535A front
Early 535s had [[selenium rectifiers]]. The 535
|introduced=1954
has a [[thermal cutoff]].
|discontinued=1973
|designers=Dick Rhiger
|manuals=
'''535'''
* [[Media:070-198.pdf    | Tektronix 535 Manual]]
* [[Media:tek_type_535_545_operators_handbook.pdf|Tektronix 535 and 545 Operators Handbook]] (OCR)
* [[Media:tek_type_535_modification_summary.pdf|Tektronix 535 Modification Summary]] (bad-OCR)
* [[Media:navair_17-20aw-08_manual.pdf|Navair 17-20AW-08 Manual, which discusses the 535]] (OCR)
'''535A'''
* [[Media:070-0145-01.pdf | Tektronix 535A Manual]] (OCR)
* [[Media:Using your 535A or 545A.pdf|Using your 535A or 545A (1960)]]
* [[Media:Operators Handbook 535A 545A 1959.pdf|Tektronix 535A and 545A Operator's Handbook 1959]]
<small>
'''Calibration'''
* [[Media:tek_type_535_fcp_low-sn.pdf|Tektronix 535 Factory Calibration Guide low-sn]] (OCR)
* [[Media:tek_type_535_fcp_high-sn.pdf|Tektronix 535 Factory Calibration Guide high-sn]] (OCR)
* [[Media:tek_type_535a_fcp.pdf|Tektronix 535A Factory Calibration Guide, August 1959]] (OCR)
* [[Media:Tek 535a fcp march 1968.pdf|Tektronix 535A Factory Calibration Procedure, March 1968]] (OCR)
</small>
}}
The '''Tektronix Type 535''' is a 10*/15 MHz dual-timebase oscilloscope that accepts [[letter-series and 1-series plug-ins]].


Type 535, the single-timebase Type [[531]],  
The 535 is functionally the same as the 30-MHz [[545]], but with a simpler, non-distributed vertical amplifier.
and the first four plug-ins, Types 53[[A]], 53[[B]], 53[[C]], and 53[[D]],
Early 535s came in brown, square-cornered cabinets; in 1956 the cabinet became blue and round-cornered.
were [[introduced in 1954|introduced in August 1954]],  
 
advertised as '...the "convertibles" of the Tektronix line'.
Type 535, the single-timebase Type [[531]], and the first four plug-ins, Types 53[[A]], 53[[B]], 53[[C]], and 53[[D]],
were [[introduced in 1954|introduced in August 1954]], advertised as ''"... the «convertibles» of the Tektronix line"''.
Types [[541]] and [[545]] [[introduced_in_1955|came out in March 1955]].
Types [[541]] and [[545]] [[introduced_in_1955|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 connector]]s for the external trigger inputs. 
Prior to 1963, the external trigger inputs used [[UHF connector]]s. 
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. 
 
<nowiki>*</nowiki> With Type [[A]] or [[B]] plug-in; 11 MHz with Type [[K]] or other fast plug-in.
 
{{BeginSpecs}}
{{SpecGroup | 535 SN 101-8627: Double-terminated delay line}}
{{Spec | Bandwidth | DC to 10 MHz (≤ 3 dB) with [[A|Type A plug-in]]  }}
{{Spec | Rise time | 0.035 μs }}
{{SpecGroup | 535 SN 8268 up  & 535A: Single-terminated delay line}}
{{Spec | Bandwidth | DC to 15 MHz (≤ 3 dB) with [[K|Type K plug-in]]  }}
{{Spec | Rise time | 0.024 μs }}
{{SpecGroup | all}}
{{Spec | Line Voltage | 108/115/122/216/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz. }}
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Power Consumption | 500 W with [[CA|Type CA plug-in]] }}
{{Spec | Cooling  | AC Fan }}
{{Spec | Trigger Modes | AC/DC/AC LF Reject, and HF Sync}}
{{Spec | CRT | early models, [[5BG]]P2, part number [[154-081]]; late models, [[T51]]; 10 kV acceleration, 6 cm × 10 cm screen}}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Weight| 65 lbs / 29.5 kg }}
{{EndSpecs}}
 
==Links==
{{Documents|Link=535}}
{{Documents|Link=535A}}
 
==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 [[Media:Service_Scope_01_Oct_1959.pdf|ServiceScope No.1, October 1959]]:
<blockquote>
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.
</blockquote>
 
==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


In 1959, Types [[531]], 535, [[541]], and [[545]] were superseded by
==Links==
Types 531A, 535A, 541A, and 545A,
which have more convenient controls. 
In addition, Types 531A and 535A have
slightly faster (15MHz vs 11MHz) vertical amplifiers.
There is a rack-mount version of the 535A, the R35A.  Starting in 1963, the 535A was
made with [[Connectors#BNC|BNC connectors]] for the external trigger inputs.  Prior to 1963, the external
trigger inputs used [[Connectors#UHF|UHF connectors]].  1970 was the last year that any
version of the 535 was sold. In 1971, 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
* [https://richardsears.wordpress.com/2011/06/18/tektronix-and-early-hewlett-packard/ Comparison of Tektronix 535, 535A, and HP 150A] with detailed pictures
blue cases with pop-off sides.
* [[120-086]] Power transformer schematic
<!-- dead link 2023-03-27 * [http://www.lydecker.org/Tektronix_535A.htm Tektronix 535A - Restoring a Swap Meet Find] -->


<nowiki>*</nowiki> With Types [[A]] or [[B]] plug-in. 11MHz with Type [[K]] or other fast plug-in.
==Pictures==
===535===
<gallery>
Tek 535 brown 1.jpg|535 with brown case
Tek 535 brown 2.jpg|535 with brown case
Tek 535 brown 3.jpg|535 with brown case
Tek 535 brown 4.jpg|535 with brown case
Tek 535 brown 5.jpg|535 with brown case
</gallery>
===RM 35===
<gallery>
Tek rm35.jpg
Tek rm35 2.jpg
Tek rm35 3.jpg
Tek rm35 4.jpg
</gallery>
===535 S1===
<gallery>
1.TEK535.JPG|535 S1
2.TEK535.JPG|535 S1
3.TEK535.JPG|535 S1
4.TEK535.JPG|535 S1
5.TEK535.JPG|535 S1
6.TEK535.JPG|535 S1
7.TEK535.JPG|535 S1
</gallery>
===535 S2===
<gallery>
Tek 535-s2 1.jpg|535-S2
Tek 535-s2 2.jpg|535-S2
Tek 535-s2 3.jpg|535-S2
</gallery>
===535A===
<gallery>
535A.jpg|535A
535_vertical2.png|vertical amplifier
Wellenkino 535a 3.jpg
Wellenkino 535a 2.jpg
Tek 535a delay line 1.jpg|535A delay line
Tek 535a delay line 2.jpg|535A delay line
Tek 535a trace.jpg|535A trace
Tek 535a on plastic.jpg|535A
</gallery>
====535A Internals====
<gallery>
Tek_535A-LHS.jpeg | LHS
Tek_535A-RHS.jpeg | RHS
Tek_535A-RHS1.jpeg | RHS
Tek_535A-top.jpeg | Top (without HV Shields)
Tek_535A-Underside.jpeg | Underside


* [http://exodus.poly.edu/~kurt/mmm/tek-535.pdf Tektronix 535 Manual (PDF)]
* [http://exodus.poly.edu/~kurt/mmm/tek-535a.pdf Tektronix 535A Manual (PDF)]
* [http://w140.com/535_545_operators_handbook.pdf Tektronix 535 and 545 Operators Handbook (PDF)]
* [http://w140.com/tek_fcp/tek_type_535_early_factory_cal_proc.pdf Tektronix 535 Factory Calibration Guide low-sn (PDF)]
* [http://w140.com/tek_fcp/tek_type_535_late_factory_cal_proc.pdf Tektronix 535 Factory Calibration Guide high-sn (PDF)]
* [http://w140.com/tek_fcp/tek_type_535a_factory_cal_proc.pdf Tektronix 535A Factory Calibration Guide (PDF)]


</gallery>
===RM35A===
<gallery>
Tek rm35a 1.JPG
Tek rm35a 2.jpg
Tek rm35a 3.jpg
Tek rm35a 4.jpg
Tek rm35a 5.jpg
Tek rm35a 6.jpg
Tek rm35a 7.jpg
Tek rm35a 8.jpg
Tek rm35a 9.jpg
Tek rm35a 10.jpg
Tek rm35a 11.jpg
Tek rm35a 12.jpg
Tek rm35a 13.jpg
Tek rm35a 14.jpg
Tek rm35a 15.jpg
Tek rm35a 16.jpg
Tek rm35a 17.jpg
Tek rm35a 18.jpg
Rm35a front.jpg|R35A front
Rm35a trig panel.jpg|R35A trigger controls
Tek-RM35A-HV-Section.jpg |  RM35A HV Section
Tek-RM35A-A-Inten-B.jpg | RM35A B intensified by A Trace
Tek-RM35A-Inside-Live.jpg |RM35A Internals
Tek-RM35A-Live-Tubes.jpg |RM35A Internals
Tek rm35a trace.jpg|RM35A trace
Tek rm35a rear2.jpg|RM35A rear
Tek rm35a rear.jpg|RM35A rear
</gallery>
===RM35AR===
<gallery>
<gallery>
Image:Rm35a front.jpg|R35A front
Tek rm35ar 1.jpg|RM35AR (mod 116B)
Image:Rm35a trig panel.jpg|R35A trigger controls
Tek rm35ar 2.jpg|RM35AR (mod 116B)
Image:535_vertical2.png|vertical amplifier
Tek rm35ar 3.jpg|RM35AR (mod 116B)
File:Wellenkino 535a 3.jpg
Tek rm35ar 4.jpg|RM35AR (mod 116B)
File:Wellenkino 535a 2.jpg
Tek rm35ar 5.jpg|RM35AR (mod 116B)
</gallery>
</gallery>
{{Parts|535}}
{{Parts|535A}}
{{Parts|RM35}}
{{Parts|RM35A}}
[[Category:500 series scopes]]
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