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* High-voltage, using T801, supplying the CRT voltages, +2300 V for the CRT anode and -1700 V for the CRT cathode
* High-voltage, using T801, supplying the CRT voltages, +2300 V for the CRT anode and -1700 V for the CRT cathode
This HV power supply [[6AQ5]] as the HV oscillator tube, and [[12AU7]] as feedback/error amplifier.  
This HV power supply uses [[6AQ5]] as the HV oscillator tube, and [[12AU7]] as feedback/error amplifier.  


* Collector sweep, using T701 (a variac) and T702, supplying the collector current to the device under test
* Collector sweep, using T701 (a variac) and T702, supplying the collector current to the device under test

Revision as of 22:06, 2 October 2018

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Transistor Curve Tracer
Tektronix 575

Produced from 1957 to (?)

Manuals
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 the family of I-V curves of the transistor.

Power Supplies

The 575 contains three separate power supplies:

  • Main Power Supply using 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 -150V, +100V, +300V regulated and +400V unregulated output. It uses a mix of tubes and silicon or selenium rectifiers (earlier S/N) for rectification. -150V and +400V unregulated/+300V regulated rail uses 6BW4 full wave rectifier tube, +100V uses silicon diodes/selenium rectifiers. -150V is the main reference supply, it uses 5651 as voltage reference, 6AN8 as the comparator/error amplifier, 12B4 as series pass tube. +100V uses 6080 as series pass tube, -150V for reference and 6AU6 tube as error amplifier. +300V Rail is similar to +100V, except that it uses 12B4 as the series pass. +400V Unregulated is provided for CRT HV Oscillator.


  • High-voltage, using T801, supplying the CRT voltages, +2300 V for the CRT anode and -1700 V for the CRT cathode

This HV power supply uses 6AQ5 as the HV oscillator tube, and 12AU7 as feedback/error amplifier.

  • Collector sweep, using T701 (a variac) and T702, supplying the collector current to the device under test

Collector Sweep

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 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.

575 with Mod 122C has 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

Pictures

Schematics