570

Tektronix 570
Curve tracer for tubes Tektronix 570 front Produced from 1955 to (?) Manuals Tektronix 570 Manual 070-167 (OCR, good quality) Tektronix 570 Manual 070-359 (1963) (good quality) Calibration 570 Factory Calibration Procedure 1964 570 Factory Calibration Procedure 1959 (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 570 was Tek's first curve tracer, introduced in 1955. It is a curve tracer for vacuum tubes. It sweeps the plate voltage between zero and a selectable maximum voltage while "stepping" the control grid through a set of voltages.

A selectable screen voltage is available for testing tubes with screens. The plate voltage is measured and applied to the X-axis of the display. Plate current is measured and amplified and is applied to the Y-axis of the display.

John Kobbe had a key role in the development of both the 570 and 575 curve tracers.

Key Specifications

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Internals

The 570 contains five transformers:

T310: center-tapped isolation transformer for plate sweep
T340: multitap transformer for heater voltages
T401: multitap autotransformer for selecting peak plate voltage, feeds T310
T501: transformer for floating supplies and screen voltage supply
T620: transformer for 60 kHz HV power oscillator for CRT voltages

The screen supply is regulated and uses a 6CD6GA tube as the series regulator.

The vertical and horizontal amplifiers are almost identical. The first stage is a differential amplifier made of two 6AU6 tubes. The second stage is a differential amplifier made of both halves of a 6BQ7A.

A T52P1 CRT is standard in the 570.