Hi I think you will find that the Russian versions were used without ovens for a long time. In the US, the only use for the glass packages past the mid 1960’s was in ovens.
Bob > On Feb 2, 2016, at 1:43 PM, iovane--- via time-nuts <[email protected]> > wrote: > > 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. _______________________________________________ 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.
