There are crystal made cheaply and then some made with more labor and
usually are more expensive. Better ones are slowly ground to frequency.
Cheaper ones are ground "close to frequency" and then "doped" to bring them
on frequency. This process is faster then the prior one. However, the
doped crystals will "drift" with age a lot more then those which have not
been doped to get them on frequency.
Lee Bahr
w0vt
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