21 pages from "Quartz Crystal Oscillator Circuits Design Handbook" by D. Firth of Magnavox Company, Fort Wayne, Indiana. This epic was published in March 1965 and this chapter contains everything I need to know about how to build a low frequency crystal oscillator using valves (tubes). Many thanks to Len Anderson for sending me this information.

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8.000 KHz OCXO

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Troublesome crystal oscillator circuit: