Fortunately one of the crystals came with some remnants of the original circuit. A suitable circuit with one side of the crystal grounded is used and I selected an emitter coupled configuration. A description can be found in “Crystal Oscillator Circuits” by Robert J. Matthys dating from 1983 and revised in 1992, at pages 53 and 134. This document is available in the web. The specific geometry of the built oscillator is due to the dimensions and constrains of the oven that will be described in a next video.
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The oscillator circuit of my vintage quartz crystals
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