It looks like the quartz is in the sealed glass "valve", or "tube".
I have removed a similar glass vacuum enclosed 100 kHz frequency marker generator from my Eddystone EA12 receiver that I bought from Tom Roberts, G3YTO (SK 1985), in September 1978. I don't use the EA12 any more and I wonder what kind of timing device I can make from this beautiful slab of quartz, approximately 28 x 5 x 2 mm. I don't have a data sheet for it, but I can see which pins are connected to the quartz. In the receiver, it has a spring stabilized black metal cover that mates to the socket. I suspect that is so that the thirteen valves and their heaters create a thermal equilibrium and the black shroud lets the crystal bathe in it. I ran the EA12 24/7 from then until I bought and used an IC-735 in January 1987. It is a GEC Crystal Unit, 100 kHz, serial number 82690 and type JCF/193, "Made in England", and it looks like it means business. Ian, G4ICV, AB2GR -- _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
