Yes, they have a trimmer (at least all of mine do). Most backs can be opened by either prying, screws, or threaded ring. It's very helpful to have good lighting and some magnifiers. If you've done any surface mount work, this would be a piece of cake.
Daun -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Max Robinson Sent: Saturday, December 01, 2007 1:09 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Chronometer contest sponsored by IEEE Spectrum In my experience watches come from the factory adjusted to gain about 5 seconds a month. The ones I have owned over the years seemed to be fairly stable in that. I have always wished there was a way for someone who is not a watch maker to open up such a watch and turn the trimmer capacitor, there has to be one, to set it right on. Then it would be much easier to tell how the crystal is aging. Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: "Hal Murray" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Friday, November 30, 2007 12:04 PM Subject: Re: [time-nuts] Chronometer contest sponsored by IEEE Spectrum > >> With a little work you might be able to precisely calculate the >> maxima of the parabola and precisely set the frequency independent of >> temp and aging. Ha! > > What's the aging like for watch crystals? > > What type of cut to watch crystals use? Are there any generalizations > about > aging? > > I don't remember any tales of watches changing from good to bad after a > couple of years. Surely there are enough geeks who keep an eye on the > performance of their watches that somebody would have noticed. Or maybe > they > setup the initial calibration so it gets better as it ages for the first > year... > > > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > 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. > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.503 / Virus Database: 269.16.12/1162 - Release Date: > 11/30/2007 9:26 PM > > _______________________________________________ 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. _______________________________________________ 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.