[time-nuts] Cesium beam tube on eBay
Magnus Danielson
cfmd at bredband.net
Fri Sep 9 01:30:37 UTC 2005
From: "Dave Carlson" <dgcarlson at sprynet.com>
Subject: Re: [time-nuts] Cesium beam tube on eBay
Date: Thu, 8 Sep 2005 13:44:07 -0700
Message-ID: <000701c5b4b6$10802bd0$820fa8c0 at symmetricom.com>
> 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" <bdale at gag.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> 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
> > time-nuts at febo.com
> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
>
> _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
More information about the Time-nuts_lists.febo.com
mailing list