I'm puzzling over this statement.  The FT-243's I have seen have a spring
that squishes the quartz blank between the electrodes.  They aren't plated
onto the quartz, but they are still in intimate mechanical and electrical
contact.

-Chuck Harris

Bob Camp wrote:
Hi

The WWII era FT-243 is one example of a crystal that has the active portion of 
the
electrodes separated from the resonator by an air gap. There are lots of similar
holders from that era that do pretty much the same thing. Non-contacting
electrodes are not very new.

Bob
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