[time-nuts] HP 5071A Electron Multiplier of Cesium Beam Tube

Rick Karlquist richard at karlquist.com
Mon Sep 7 03:54:15 UTC 2009

John Miles wrote:
> Of course, you'd hear the same thing if you asked the modern-day HP if
> they
> could refurbish an inkjet cartridge. :)  Not the same thing, and not the
> same company, I know... but still, HP had no incentive to try very hard to
> develop a reconditioning process, at least before Datum started selling
> replacement tubes.


Wait a minute.  Datum owns Symmetricom which bought HP/Agilent's
CBT production line and admits that their tubes were never as
good as HP/Agilent's tubes.  The 5071, as opposed to the 5061, has
a ROM with a password in the CBT so that only OEM tubes will work.
The password consists of a poem written by Len Cutler.  The poem is
copyrighted so that it would be illegal for a competitor to simply
reproduce it, according to Len.

Rick Karlquist N6RK

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