[AMRadio] National Calibrator

Bry Carling bcarling at cfl.rr.com
Sat Aug 15 18:13:44 EDT 2009

Jim - what type of crystal holder do they use?

I have replacement crystals for sale, that you could press into 
service there - on both 1000 KC. and also on 100 KC.

Best regards - Brian, AF4K

From:           	"Jim" <ars-w5jo at brightok.net>

> 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 
> constructed?
> 73
> Jim/W5JO 
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