G'day Joe,
My call on <this> question is: "very seldom with a properly designed circuit and crystal" (NO flames please on these descriptions !) Having said that, I have a couple of broken crystals from once-working HP E1938A oscillators. All appear to have some form of physical fracture or electrical disconnect within the copper crystal capsule. A careful shake makes a re-connection but fails if the capsule is moved even slightly. I've not attempted to butcher a capsule open to determine the cause - this to my mind is bordering on the sacrilegious but if given absolution from another TimeNut, I may attempt it and photograph the results ... Regards, Kit VK2LL ************* Do XTAL's fail often? If so, by what mechanism? Slowly fade away? Sudden death? I am not experienced enough to know this answer but in all my years with various HAM gear, I do not recall the failure of a single XTAL. However, none of these were in an oven. Thanks again for all the useful information. Joe _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
