[time-nuts] Cesium beam tube on eBay
cfmd at bredband.net
Thu Sep 8 21:30:37 EDT 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
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.
> 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
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