570: Difference between revisions

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The Tektronix 570 is a curve tracer for tubes.  It sweeps the plate voltage between zero and a selectable maximum voltage
The Tektronix 570 is a curve tracer for tubes.  It sweeps the plate voltage between zero and a selectable maximum voltage
while "stepping" the control grid through a set of voltages.   
while "stepping" the control grid through a set of voltages.   
A selectable screen voltage is available for testing tubes with screens.
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.  The plate current is measured and amplified and
is applied to the Y-axis of the display. 





Revision as of 22:48, 13 September 2011

The Tektronix 570 is a curve tracer for 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. The plate current is measured and amplified and is applied to the Y-axis of the display.


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
  • T501: transformer for floating supplies and screen voltage supply
  • T620: transformer for 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.