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{{Oscilloscope Sidebar|
{{Oscilloscope Sidebar|
title=Tektronix 575 |
title=Tektronix 575 |
image=Tek 575 8250.JPG |
image=Tek_575-Front-Trace.jpeg |
caption=Tektronix 575 |
caption=Tektronix 575 |
introduced=1957 |
introduced=1957 |
discontinued=(?) |
discontinued=1972 |
summary=Transistor Curve Tracer |
summary=Transistor Curve Tracer |
manuals=
manuals=
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* [http://w140.com/tek-575-122c.pdf Tektronix 575 with Mod 122C Manual (PDF)]
* [http://w140.com/tek-575-122c.pdf Tektronix 575 with Mod 122C Manual (PDF)]
* [http://w140.com/tektronix_575_mod_122c_modifications.pdf Mod 122C Kit Manual (PDF)]
* [http://w140.com/tektronix_575_mod_122c_modifications.pdf Mod 122C Kit Manual (PDF)]
* [[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]]
* [http://w140.com/tek_fcp/tek_575_fac_cal.pdf Tektronix 575 Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_fcp/tek_575_fac_cal.pdf Tektronix 575 Factory Calibration Procedure (PDF)]
* [http://w140.com/tek_3-terminal_adapter_013-0069-00.pdf 013-0069-00 3-Terminal Adapter (PDF)]
* [http://w140.com/tek_3-terminal_adapter_013-0069-00.pdf 013-0069-00 3-Terminal Adapter (PDF)]
* [[Media:Nuvistor checking procedure with 575.pdf|Nuvistor Checking Procedure with 575 (PDF, needs OCR)]]
* [[Media:040-0223-00.pdf|Mod M5272: Silicon Rectifier]]
* [[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 mod 122D.pdf]]
* [[Media:Tek 575 rackmount.pdf]]
* [[Media:Tek 575 cal outline.pdf]]
}}
}}
The '''Tektronix 575''' is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
The '''Tektronix 575''' is a curve tracer for transistors, [[introduced in 1957|introduced in March 1957]].
Line 49: Line 68:
=== Step Source ===
=== Step Source ===
This uses a gated Miller integrator to generate controlled steps.   
This uses a gated Miller integrator to generate controlled steps.   
The result is a staircase waveform, which generates different traces in the the family of I-V curves of the transistor.
The result is a staircase waveform, which generates different traces in the family of I-V curves of the transistor.


===  Power Supplies ===
===  Power Supplies ===
The 575 contains three separate power supplies:
The 575 contains three separate power supplies:
* Main Power Supply using T601 (120-095 and, later, [[120-0095-01]]),
* A '''main power supply''' around T601 (120-095 and, later, [[120-0095-01]]), supplying power to the amplifiers and step generator in the 575.
supplying power to the amplifiers and step generator in the 575
:This power supply follows the standard 500-series power supply design.
* High-voltage, using T801, supplying the CRT voltages, +2300 V for the CRT anode and -1700 V for the CRT cathode
:In addition to heater power, it provides −150 V, +100 V, +300 V regulated and +400 V unregulated output.
* Collector sweep, using T701 (a variac) and T702, supplying the collector current to the device under test
: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]].
=== Collector Sweep ===
: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.
Power from the mains goes through an isolation transformer and a variac
:The +100 V regulator uses a [[6080]] series pass tube and a [[6AU6]] tube as the error amplifier.
and is rectified by germanium diodes to produce the collector sweep voltage.
:The +300 V regulator is similar to the +100 V circuit, except that it uses a [[12B4]] series pass tube.
The isolation transformer has two pairs of secondary taps,
:Unregulated +400 V is provided for the CRT HV Oscillator.
one for high voltage (0 to 200 V) and low current, the other for low voltage (0 to 20 V) and high current.
* A '''high-voltage supply''' around T801, supplying the CRT voltages, +2300 V for the CRT anode and −1700 V for the CRT cathode.
The maximum power that can be delivered to the transistor in either mode is approximately 200 Watts.
: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.
575 with Mod 122C has extended collector sweep voltage to 400 V.
: 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 ===
=== Rectifiers ===
Early 575 versions used [[selenium 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.   
A kit for conversion to silicon diodes was available and is documented in the back of the manual.   
===CRT===
The 575 uses the Tektronix [[T0520]] CRT.


The 575 has a [[thermal cutoff]].   
The 575 has a [[thermal cutoff]].   
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==Links==
==Links==
* [https://lazyelectrons.wordpress.com/2018/10/13/tektronix-575-curve-tracer-restore/ A Tek 575 Restoration with video]
* [http://w140.com/tek_575_use.pdf "A Power Curve Tracer At Surplus Prices" by Dennis L. Feucht (PDF)]
* [http://w140.com/tek_575_use.pdf "A Power Curve Tracer At Surplus Prices" by Dennis L. Feucht (PDF)]
* [http://classictek.org/images/stories/Articles/assorted_material/Using_Tek_575.pdf Some Transistor Measurements Using the Type 575]
* [http://www.oscilloscopemuseum.com/oscilloscope-tektronix-575-s1957.html Tek 575 @ oscilloscopemuseum.com]
* [http://www.oscilloscopemuseum.com/oscilloscope-tektronix-575-s1957.html Tek 575 @ oscilloscopemuseum.com]
* [http://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]
==See Also==
* [[067-078]]


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 575 npn traces.jpg
Tek_575-Front-Trace.jpeg | NPN Trace
Tek 575 tq.jpg |575 w/o Mod 122C
Tek 575 tq.jpg |575 w/o Mod 122C
575_122C.JPG|575 w Mod 122C
575_122C.JPG|575 w Mod 122C
Tek 575 left.jpg
Tek_757_Cart.jpg | 575 In a Cart
Tek 575 right.jpg
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_TestPanel.jpg | 575 Test Panel
Tek 575 transistor sockets.jpg | Test Sockets
Tek 575 pnp trace.jpg
Tek 575 pnp trace.jpg
Tek 575 8250.JPG
Tek_757_Cart.jpg | 575 In a Cart
Tek 575 display.jpg
Tek 575 display.jpg
Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Tek 575 tunnel diode.jpg|575 testing a tunnel diode
Tek 575 top.jpg
Tek_575_NPN.jpg | NPN - Curve of 2N3904
Tek 575 internal.jpg
Tek_575_PNPCurve_2N2207.jpg | PNP - Curve of 2N2207
Tek 575 Side.jpg | Internal Side View
Tek_575_5651_VRCurve.jpg | 5651 VR Tube in 575
Tek 575 rear.jpg
Tek_575_NPN-hfe_Curve.jpg | hFE curve of a 2N3904 in 575
Tek_575_Underside.jpg | Bottom#1
</gallery>
Tek 575 bottom.jpg  | Bottom#2
===Internal===
Tek 575 bottom rear.jpg  | Bottom Rear
 
Tek_575_Chart.png | 575 Load Resistance Chart
<gallery>
Tek 575 hvps 1.jpg  | High-Voltage Power Supply
USA Tektronix 575 Front RAW.jpg
Tek_575_NoCRT.jpg | Front without CRT
Tek_575_NoCRT.jpg | Front without CRT
USA Tektronix 575 InsideR0.jpg
Tek_575-Internal-Top.jpeg | Internal Top
Tek_575_Top.jpg | Top View without Support Bar
Tek-575-Internal-Bottom.jpeg | Internal Bottom
Tek_575-Internal-RHS.jpeg | Internal RHS
Tek_575-Internal-LHS.jpeg | Internal LHS
575 int 1.jpg
575 int 1.jpg
575 int 2.jpg
575 int 2.jpg
575 int 3.jpg
575 int 3.jpg
USA Tektronix 575 InsideR0.jpg
Tek 575 left.jpg
Tek 575 right.jpg
Tek_575-HVSection.jpeg | HV Section
Tek 575 hvps 1.jpg  | High-Voltage Power Supply
Tek 575 CollectorSweep.jpg | Collector sweep germanium rectifier and dissipation resistor stack
Tek_575_Rectifier.jpg | Rectifiers - Silicon Diode Version
Tek_575_Rear_FanRmvd.jpg | Rear View, Air-filter/Fan Removed.
Tek_575_CRTConn.jpg | Def Plate  Connections
575 int 4.jpg
575 int 4.jpg
575 int 5.jpg  
575 int 5.jpg  
Tek 575 transistor sockets.jpg
Tek 575 internal.jpg
Tek 575 npn traces.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>
</gallery>
===Schematics===
===Schematics===

Revision as of 11:42, 6 May 2021

Manuals – Specifications – Links – Pictures

The Tektronix 575 is a curve tracer for transistors, 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.

Key Specifications

Collector Sweep 0−200 V minimum peak with 1 A current curves, 0−20 V minimum peak with 20 A current curves
Vertical Display plots collector current from 0.01 mA/div to 1 A/div ±3% in 16 Steps
Vertical Display plots base voltage from 0.01 V/div to 0.5 V/div ±3% in 6 Steps
Horizontal Display plots collector voltage from 0.01 V/div to 20 V/div ±3% in 11 Steps
Horizontal Display plots base voltage from 0.01 V/div to 0.5 V/div ±3% in 6 Steps
CRT T52P, P1 phosphor, P2/P7/P11 on request ; 4.2 kV acceleration
Line voltage 105−125 V or 210−250 VAC, 50 to 60 Hz
Power 200 W in standby, 400 W max − Actual consumption based on transistor being tested
Size (W/L/H) 13" × 24" × 16¾"
Weight ~30 kg (70 lb)
Cooling AC Fan
Construction Aluminum alloy chassis, anodized front panel, blue vinyl coated cabinet

History

John Kobbe says:

While I was working on the 540 series vertical amplifier, Virgil Briton, whose bench was next to me, had put together a vacuum tube curve tracer using stepping relays and other mechanical devices. I remember thinking that, that was a neat display even if it did a lot clicking and was slow. After putting the cross hatch generator together, I knew it would be very easy to do the curve tracer electronically,it started for in house use,but after putting a self-contained instrument together, Tek decided to call it 575 and sell it.

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. The CRT has −1700 V on the cathode and +2500 V on the anode. The HV power supply uses two 5642 rectifier tubes.

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.

Step Source

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.

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.

CRT

The 575 uses the Tektronix T0520 CRT.

The 575 has a thermal cutoff.

Type 175 High Current Adaptor

575 on top of a 175

The 575 can be paired with a 175 for high current device measurements.

Links

See Also

Pictures

Internal

Schematics