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Crystal Photo

The photo to the right shows the typical structure of four glass encapsulated quartz crystals.

From left to right the frequencies are 85.18KHz, 100KHz, 500KHz and 8.991MHz.

The photo to the right shows an octal based glass encapsulated 12.6KHz crystal made by STC in the early 60s. With Qs in the upper thousands the frequency response will typically be less than 1Hz wide.