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The Tektronix 575 is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
{{Instrument Sidebar
It can be thought of as being composed of three modules: an x-y display, a step source, and a collector
|manufacturer=Tektronix  
sweep source.
|class=Curve Tracer
|model=575
|summary=Curve tracer for transistors
|image=Tek_575-Front-Trace.jpeg
|caption=Tektronix 575
|introduced=1957
|discontinued=1972
|designers=John Kobbe
|manuals=
* [[Media:070-255.pdf|Tektronix 575 and 175 Manual]]
* [[Media:tek-575-122c.pdf|Tektronix 575 with Mod 122C Manual]]
* [[Media:Tek 575 rackmount.pdf|Tektronix 575 rackmount images]]


== X-Y display ==
<small>
The vertical and horizontal amplifiers are very similar,  
'''Modifications'''
* [[Media:Tek_575_Mod_Summaries.pdf|Tektronix 575 Modification Summaries]] / <small> [[Media:Tektronix575ModSummaries.pdf|Tektronix 575 Modification Summaries]]</small>
* [[Media:Tektronix_575_mod_122c_modifications.pdf|Mod 122C Kit Manual]]
* [[Media:Tek 575mod122c correspondence.pdf|Correspondence Regarding 575 Mod 122A and C]]
* [[Media:Tek 575 mod 122D.pdf|Modification 122D]]
* [[Media:Tek 575 mod 122c description 1961.pdf|Tektronix 575 Mod 122C Description 1961]]
* [[Media:Tek 575 122c instructions for custom instruments.pdf|Tektronix 575 Mod 122C Instructions for Custom Instruments]]
* [[Media:Tek 575 mod 122c instructions.pdf|Tektronix 575 Mod 122C Instructions]]
* [[Media:Tek 575 122c parts list.pdf|Tektronix 575 Mod 122C Parts List]]
* [[Media:040-0223-00.pdf|Mod M5272: Silicon Rectifier]]
* [[Media:040-0276-00.pdf|Mod 122C: Increased collector volts]]
* [[Media:050-0021-00.pdf|Mod M2058, M10070, M8244: Base Step Generator Polarity Switch Replacement]]
* [[Media:050-0070-01.pdf|Mod M6375: Transistor Selector Switch Replacement]]
* [[Media:050-0065-00.pdf|Mod M3873: Precision Resistor Replacement]]
* [[Media:050-0104-00.pdf|Mod for Horizontal Volts/Div Switch Replacement]]
* [[Media:050-0218-00.pdf|Mod for P7 CRT Replacement]]
* [[Media:050-0218-11.pdf|Mod for P11 CRT Replacement]]
* [[Media:050-0218-12.pdf|Mod for P31 CRT Replacement]]
* [[Media:050-0383-00.pdf|Mod M12361: Horizontal and Vertical Amplifier Tube Replacement]]
* [[Media:Jan 1959 tek 575 fcp with cal check.pdf]]
* [[Media:Tek 575 rackmount westinghouse.pdf|Rackmount 575]]
 
'''Calibration'''
* [[Media:tek_575_fac_cal.pdf|Tektronix 575 Factory Calibration Procedure]]
* [[Media:tek_3-terminal_adapter_013-0069-00.pdf|013-0069-00 3-Terminal Adapter]]
* [[Media:Tek 575 cal outline.pdf]]
 
'''Miscellaneous'''
* [[Media:Nuvistor checking procedure with 575.pdf|Nuvistor Checking Procedure with 575]]
* [[Media:575_Usage_-_Some_Transistor_Measurements_Using_the_575.pdf|Some Transistor Measurements Using the Type 575]]
* [[Media:Tek 175 higher voltage discussion.pdf|Discussions of Modification to 575 for Higher Voltage]]
* [[Media:Tek 575a discussion.pdf|Discussion of Possible 575A]]
</small>
}}
The '''Tektronix 575''' is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
 
It can be thought of as being composed of three modules: an X-Y display, a step source, and a collector sweep source.
 
Unlike later curve tracers, the 575 can optionally display base voltage on the vertical axis.
 
{{BeginSpecs}}
{{Spec | Collector Sweep    | 0−200 V minimum peak with 1 A current curves, 0−20 V minimum peak with 20 A current curves }}
{{Spec | Vertical Display    | I<sub>C</sub> 0.01 mA/div to 1 A/div ±3% in 16 Steps, or U<sub>B</sub> 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | Horizontal Display  | U<sub>C</sub> 0.01 V/div to 20 V/div ±3% in 11 Steps, or U<sub>B</sub> 0.01 V/div to 0.5 V/div ±3% in 6 Steps }}
{{Spec | CRT                | [[T0520]], P1 phosphor, P2/P7/P11 on request; 4.2 kV acceleration }}
{{Spec | Power              | 105−125 V or 210−250 V<sub>AC</sub>, 50 to 60 Hz; 200 W in standby, 400 W max; thermal cutoff}}
{{Spec | Size                |  (W/L/H) 13" × 24" × 16¾"  }}
{{Spec | Weight              | ~30 kg (70 lb) }}
{{EndSpecs}}
 
==Links==
* [https://lazyelectrons.wordpress.com/2018/10/13/tektronix-575-curve-tracer-restore/ A Tek 575 Restoration with video]
* [https://w140.com/tek_575_use.pdf ''A Power Curve Tracer At Surplus Prices''], by [[Dennis Feucht]]
* [https://www.oscilloscopemuseum.com/oscilloscope-tektronix-575-s1957.html Tek 575 @ oscilloscopemuseum.com]
* [https://techchannel.att.com/play-video.cfm/2011/7/1/AT&T-Archives-Microworld Tek 575 in AT&T film "Microworld" (1976)] at ~6:00
* [http://www.ke5fx.com/A_VTCT_Adapter_for_All_Tektronix_SCTs_W7PF.pdf Dennis Tillman: An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers]
* [https://www.youtube.com/watch?v=Ix7ju0Q8YZg Zenwizard Studios - Curve Tracer Basics]
* [https://www.youtube.com/watch?v=Wpok66re3G0 Zenwizard Studios - Zen's Curve Tracer Buying Guide]
 
{{Documents|Link=575}}
{{Documents|Link=Curve tracers}}
 
==History==
[https://vintagetek.org/my-early-tektronix-days-by-john-kobbe-2/ John Kobbe says]:
<blockquote>
When transistors started to become practical, Tek sent [[Bill Polits]] to Michigan, for a 2 week primer on transistors.
He in turn communicated it to the rest of us who were interested. That called for a transistor curve tracer.
It used a similar step generator as the tube curve tracer but otherwise needed mostly new circuits.
I remember a day at the beach, I was trying to hide from the sun while everyone else was getting their sunburn.
I dug the sand out from under our new 1954 Chevy, got comfortable and figured out the circuits for the curve tracer soon to become the 575.
[[Deane Kidd]] did the hard part when he designed the switches.
</blockquote>
 
==Internals==
=== X-Y display ===
The vertical and horizontal amplifiers are very similar,
using the two halves of a [[6CG7]] dual-triode tube as the output amplifier.   
using the two halves of a [[6CG7]] dual-triode tube as the output amplifier.   
The CRT has -1700V on the cathode and +2500V on the anode.
The CRT has −1700 V on the cathode and +2500 V on the anode.
The HV power supply uses two [[5642]] rectifier tubes.   
The HV power supply uses two [[5642]] rectifier tubes.   


== Step Source ==
It is possible to use the 575 as an X-Y monitorThe vertical and horizontal
This uses a gated miller integrator to generate controlled steps.   
range switches have settings for external input, at 0.1 V/div sensitivity.
The result is a staircase waveform, which generates different traces in the the family of I-V curves of the transistor.  


== Collector Sweep ==
=== Step Source ===
Power from the mains goes through an isolation transformer and a variac and is rectified by germanium diodes to produce the collector sweep voltage.  The isolation transformer has two pairs of secondary taps, one for high voltage (0 to 200V) and low current, the other for low voltage (0 to 20V) and high current.  The maximum power that can be delivered to the transistor in either mode is approximately 200 watts.
This uses a gated Miller integrator to generate controlled steps.   
The result is a staircase waveform, which generates different traces in the family of I-V curves of the transistor.


575 with Mod122c has extended collector sweep voltage to 400V.
===  Power Supplies ===
The 575 contains three separate power supplies:
* A '''main power supply''' around T601 (120-095 and, later, [[120-0095-01]]), supplying power to the amplifiers and step generator in the 575.
:This power supply follows the standard 500-series power supply design.
:In addition to heater power, it provides −150 V, +100 V, +300 V regulated and +400 V unregulated output.
:It uses a mix of tubes and silicon or [[selenium rectifiers]] (earlier S/N) for rectification.
:The −150 V and +400 V unregulated/+300 V regulated rails are supplied through [[6BW4]] full wave rectifier tubes, the +100 V circuits through silicon diodes/[[selenium rectifiers]].
:The −150 V rail is the main reference supply.  Its regulator uses a [[5651]] voltage reference, a [[6AN8]] as the comparator/error amplifier, and a [[12B4]] as series pass tube.
:The +100 V regulator uses a [[6080]] series pass tube and a [[6AU6]] tube as the error amplifier.
:The +300 V regulator is similar to the +100 V circuit, except that it uses a [[12B4]] series pass tube.
:Unregulated +400 V is provided for the CRT HV Oscillator.
* A '''high-voltage supply''' around T801, supplying the CRT voltages, +2300 V for the CRT anode and −1700 V for the CRT cathode.
:This HV power supply uses a [[6AQ5]] as the HV oscillator tube, and a [[12AU7]] as the feedback/error amplifier.
* A '''collector sweep supply''' for the device under test.
: Power from the mains goes through an isolation transformer (T701) and a variac (T702) and is rectified by germanium diodes to produce the collector sweep voltage.
: The isolation transformer has two pairs of secondary taps, one for high voltage (0 to 200 V) and low current, the other for low voltage (0 to 20 V) and high current.
: The maximum power that can be delivered to the transistor in either mode is approximately 200 Watts.
: 575s with Mod 122C offer extended collector sweep voltage to 400 V.
 
=== Rectifiers ===
Early 575 versions used [[selenium rectifiers]].
A kit for conversion to silicon diodes was available and is documented in the back of the manual.


== Type 175 High Current Adaptor ==
== Type 175 High Current Adaptor ==
The 575 can be paired with a [[175]] for high current device measurements.
[[File:Tek 575 on 175.jpg | thumb | right | 575 on top of a [[175]]]]
<gallery>
The 575 can be paired with a [[175]] for high current device measurements.
File:Tek 575 on 175.jpg|575 on 175
</gallery>
It is possible to use the 575 as an X-Y monitor.  The vertical and horizontal
range switches have settings for external input, at 0.1 V/div sensitivity.


== Rectifiers ==
==See Also==
Early 575 versions used [[selenium rectifiers]].  A kit for conversion to
* [[067-078]]
silicon diodes was available and is documented in the back of the manual. 
* [[Nuvistor Checker-Balancer]]


The 575 has a [[thermal cutoff]]. 
==Pictures==


* [http://bama.edebris.com/download/tek/575-175/tek%20575%20&%20175.v6.pdf Tektronix 575 and 175 Manual (PDF)]
<gallery>
* [http://w140.com/tek-575-122c.pdf Tektronix 575 with Mod 122C Manual (PDF)]
Tek 575 npn traces.jpg
* [http://w140.com/tek_575_use.pdf "A Power Curve Tracer At Surplus Prices" by Dennis L. Feucht (PDF)]
Tek_575-Front-Trace.jpeg | NPN Trace
* [http://classictek.org/images/stories/Articles/assorted_material/Using_Tek_575.pdf Some Transistor Measurements Using the Type 575]
Tek 575 tq.jpg |575 w/o Mod 122C
* [http://w140.com/tek_fcp/tek_575_fac_cal.pdf Tektronix 575 Factory Calibration Procedure (PDF)]
575_122C.JPG|575 w Mod 122C
* [http://w140.com/tek_3-terminal_adapter_013-0069-00.pdf 013-0069-00 3-Terminal Adapter (PDF)]
Tek_757_Cart.jpg | 575 In a Cart
Tek 575 mod 118 1.jpg|Tektronix 575 Mod 118
Tek 575 mod 118 2.jpg|Tektronix 575 Mod 118
USA Tektronix 575 Front RAW.jpg
Tek 575 8250.JPG
Tek_575-Top.jpeg | Top
Tek_575_Chart.png | 575 Load Resistance Chart
Tek 575 top.jpg
Tek_575-Rear.jpeg | Rear
Tek 575 rear.jpg
Tek_575_TestPanel.jpg | 575 Test Panel
Tek 575 transistor sockets.jpg | Test Sockets
Tek 575 pnp trace.jpg
Tek 575 display.jpg
Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Tek_575_NPN.jpg | NPN - Curve of 2N3904
Tek_575_PNPCurve_2N2207.jpg | PNP - Curve of 2N2207
Tek_575_5651_VRCurve.jpg | 5651 VR Tube in 575
Tek_575_NPN-hfe_Curve.jpg | hFE curve of a 2N3904 in 575
Tek 575 with 175.jpg|575 with 175
</gallery>
===Internal===


<gallery>
<gallery>
Image:Tek 575 tq.jpg|575 w/o Mod 122C
Tek_575_NoCRT.jpg | Front without CRT
Image:575_122C.JPG|575 w Mod 122C
Tek_575-Internal-Top.jpeg | Internal Top
Image:Tek 575 display.jpg
Tek_575_Top.jpg | Top View without Support Bar
Image:Tek 575 top.jpg
Tek-575-Internal-Bottom.jpeg | Internal Bottom
Image:Tek 575 internal.jpg
Tek_575-Internal-RHS.jpeg | Internal RHS
Image:Tek 575 rear.jpg
Tek_575-Internal-LHS.jpeg | Internal LHS
Image:Tek 575 collector sweep2.png|Unmodified Collector Supply
575 int 1.jpg
Image:Tek 575 122c-collector supply.png|Collector Supply Rectifier with MOD122C
575 int 2.jpg
File:Tek 575 ps.png|Main Power Supply
575 int 3.jpg
File:Tek 575 step gen.png|Step Generator
USA Tektronix 575 InsideR0.jpg
File:Tek 575 amplifiers.png|Amplifiers
Tek 575 left.jpg
File:Tek 575 crt circuit.png|CRT Circuit
Tek 575 right.jpg
File:Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Tek_575-HVSection.jpeg | HV Section
File:Tek 575 8250.JPG
Tek 575 hvps 1.jpg | High-Voltage Power Supply
File:Tek 575 bottom.jpg|Bottom
Tek 575 CollectorSweep.jpg | Collector sweep germanium rectifier and dissipation resistor stack
File:Tek 575 bottom rear.jpg|Bottom Rear
Tek_575_Rectifier.jpg | Rectifiers - Silicon Diode Version
File:Tek 575 hvps 1.jpg|High-Voltage Power Supply
Tek_575_Rear_FanRmvd.jpg | Rear View, Air-filter/Fan Removed.
Tek_575_CRTConn.jpg | Def Plate  Connections
575 int 4.jpg
575 int 5.jpg
Tek 575 internal.jpg
Tek 575 Side.jpg | Internal Side View
Tek_575_Underside.jpg | Bottom#1
Tek 575 bottom.jpg | Bottom#2
Tek 575 bottom rear.jpg | Bottom Rear
Tube_154-0343-00.jpg | CRT of 575, Type [[T0520]]
Tek_575_Live.jpg | Inside view of a live 575
</gallery>
===Schematics===
<gallery>
Tek 575 collector sweep2.png|Unmodified Collector Supply
Tek 575 122c-collector supply.png|Collector Supply Rectifier with MOD122C
Tek 575 ps.png|Main Power Supply
Tek 575 step gen.png|Step Generator
Tek 575 amplifiers.png|Amplifiers
Tek 575 crt circuit.png|CRT Circuit
</gallery>
</gallery>


==Components==
{{Parts|575}}


[[Category:Curve tracers]]
[[Category:Curve tracers]]
[[Category:Specifications needed]]
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