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April 24, 2017

This video outlines the set up, calibration and use of Riverstone Audio's Record-Level Turntable Vertical Tracking Force Gauge.   Our VTF gauge allows tracking force measurements at record level.  

January 20, 2017

How 5654, 5654W and 6AK5 vacuum tubes are tested and selected at Riverstone Audio.

May 1, 2013

This video shows the testing of vintage GE JAN 5654W vacuum tubes using a Hickok 539B tube tester, and highlights the test parameters used for quality checks and tube matching on Hickok 539B/C series tube testers. The 5654W vacuum tube was originally designed as a prem...

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Testing and matching GE JAN 5654W tubes

May 1, 2013

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