570

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

Manuals – Specifications – Links – Pictures

The Tektronix 570 is a curve tracer for tubes, introduced in 1955. 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.

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.