[time-nuts] eBay: HP Cesium Beam Tube Hewlett Packard 1924A 029090581

[Dave Carlson]

Jack,

See the thread below on this CBT, if it's indeed the same one.

Dave

----- Original Message ----- 
From: "Dave Carlson" <dgcarlson at sprynet.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: September 08, 2005 1:44 PM
Subject: Re: [time-nuts] Cesium beam tube on eBay


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.

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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