[AMRadio] National Calibrator

Jim ars-w5jo at brightok.net
Sat Aug 15 15:25:48 EDT 2009

Has anyone ever worked on a National XCU 50 crystal calibrator? 
Specifically I am curious about the Valpey crystal in it.  The one 
meg side is not working and I believe the quartz slab may be cleaned 
to restore operation.  The caveat is I am a bit hesitant to open the 
case without knowing what to expect.

Has anyone here ever taken one apart that can tell me how they are 



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