[time-nuts] Cesium beam tube on eBay

[Magnus Danielson]

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
> >
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> 
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