[time-nuts] 5071A tube EEPROM and tube data

Predrag Dukic stijena at tapko.de
Thu Sep 10 07:08:27 UTC 2009




Dave,

Do You know the Cs level of purity used for CBTs


Predrag Dukic



At 08:30 10.9.2009, you wrote:
>Corby wrote: "I'm not saying other tubes dont have glass but HP tubes DO
>NOT."
>
>On what authority? That statement is categorically incorrect.
>
>To set the record straight I worked for HP and Agilent since 1977 as a
>technician on the 5061 and later worked on the introduction of the 5071A
>with the newer small-format CBT needed for that chassis. I've had direct
>contact with the physicists, engineers, glass-blowers, and assemblers of the
>CBT and have handled the components that make up a CBT. I've given
>presentations to Agilent Sales Engineers at neophyte seminars, given
>training on the physics principles of the CBT and have learned what I know
>from the people who created the Cesium Beam Tube. I think I know what goes
>inside an HP or Agilent CBT.
>
>The ampoules are glass. They are filled using a "cow"  that is a string of
>several ampoules  that are simply a bulge in the end of a glass tube. When
>all the ampoules are filled   with exactly the correct amount of cesium,
>they are each "calved" off the string using a glass-blowing torch. It's a
>fascinating process and would not work if the ampoules were metal.
>
>Now I'll concede that at some time in the past HP may have switched their
>process from a metal to a glass ampoule, and you should know if you indeed
>pulled that oven from an older HP CBT. But don't say that HP doesn't used
>glass. That's absolutely wrong. They did when they were HP, and continued to
>do so when they became Agilent. I was there.
>
>Dave Carlson
>
>From: "Corby Dawson" <cdelect at juno.com>
>To: <time-nuts at febo.com>
>Sent: Wednesday, September 09, 2009 14:00
>Subject: [time-nuts] 5071A tube EEPROM and tube data
>
>
>"The HP tubes used a heated metal "burst" diaphragm not glass ampoules
>to"
>
>Dave,
>
>Actually, YES.
>
>I dug up the oven I had opened up and it is as I remembered.
>
>The cesium ampoule is all metal and sits upside down in the center of the
>"wicking" screen.
>
>The center of the burst diaphragm is welded to a post that comes out the
>top of the oven via an insulated feedthru.
>
>When they want to free the cesium they apply a high current thru the post
>and it melts a hole where the post was welded to the diaphragm.
>
>NO glass inside the wicking or inside the ampoule.
>
>I'm not saying other tubes dont have glass but HP tubes DO NOT.
>
>I'll see if I can look thru my box of ovens and if I have an FTS oven
>I'll cut it open and see.
>
>Corby Dawson
>
>I do have PIX of the above but nowhere to post them!
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