From: "Dave Carlson" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Cesium beam tube on eBay Date: Thu, 8 Sep 2005 13:44:07 -0700 Message-ID: <[EMAIL PROTECTED]>
> Based on data I have, it pre-dates March 1986. Unfortunately the earliest > serial number I have is 3156 (last 4 digits) so not extremely accurate. > > This is definitely an old CBT and would be surprising if it had any life at > all. Unless of course that for some reason it has been stuck in storage and remained unused, which I seriously doubt. > BTW the 1924A does indeed indicate 1979 and the 24th week, but please > remember that this is the yyww of the last significant engineering change to > the model number. > The 1924A prefix remained unchanged until the 3232A prefix (smaller-diameter > CBT), over 13 years later, so not a good indicator of age, at all. Good point. Cheers. Magnus > Dave Carlson > > ----- Original Message ----- > From: "Bdale Garbee" <[EMAIL PROTECTED]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Thursday, September 08, 2005 7:10 AM > Subject: Re: [time-nuts] Cesium beam tube on eBay > > > > On Thu, 2005-09-08 at 09:57 +0200, Magnus Danielson wrote: > >> serial number 1924A02909 > > > > If I recall correctly, HP serial numbers of that vintage are YYWWCNNNNN. > > > > YY is the year expressed in years since an epoch, usually 1960. So 19 > > means 1979. > > > > WW is the week of the year in which the last manufacturing change was > > made. > > > > C is the manufacturing location, A means USA. > > > > NNNNN is a sequential unit number. > > > > Bdale > > > > _______________________________________________ > > time-nuts mailing list > > [email protected] > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
