I think that these crystals were designed to be placed in an oven, which worked as a shield too. I have a similar crystal made by Racal in the 60's, and in my case it is fitted with the classic octal tube-type plug. It was housed (still is) in a heavy massive shimmering chrome-plated cylindrical brass enclosure, a beauty to see, It was the timebase of a tube-type synthesizer with lots of tubes. Themperature control was achieved by means of a mercury thermometer in which mercury actuated a contact when reaching a wire crossing the capillary tube.
Antonio I8IOV >Da: Bob Camp <[email protected]> >Data: 02/02/2016 13.15 >A: "Discussion of precise time and frequency measurement"<[email protected]> >Ogg: Re: [time-nuts] Glass Envelope Quartz Crystals > >Hi > >Since the 25 MHz crystal has already been soldered into a circuit, putting it in a >socket is probably not a real good idea. It’s also a leaded part. Even with fat pins >sockets can be an issue. With wire leads, you are asking for trouble. > >Functionally, there is little there is little difference between a glass package crystal >and a metal package. About the only real one is the obvious - one has a metal shield >you can (but sometimes don’t) ground. > >Bob > > >> On Feb 1, 2016, at 9:58 PM, Daniel Watson <[email protected]> wrote: >> >> Hi, >> >> I purchased a pair of interesting glass envelope crystals for a project. >> Here are some pictures: >> >> http://syncchannel.blogspot.com/2016/02/glass-envelope-quartz-crystals.html >> >> Does anyone have an idea about what mount/socket I should buy for these? I >> read a previous thread on the list about Bliley crystals using a B7G mount, >> but I'm not sure if that type might work here. >> >> Also, when building up a circuit to make these oscillate, are there any >> specific differences about crystals in this package that I should keep in >> mind? >> >> >> Thanks much, >> >> Dan W. _______________________________________________ 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.
