Having two HP CBT's minus enclosure sitting on my window sill, allow me to
ad my two cents worth. Looking at the assemblies I see more art than
science and duplicating something like that would most likely end in failure.
Comparing that to the previous H Maser discussions the collective know how
and resources of the list could maybe result in a Maser.
As to refurbishing tubes some of us have discussed that off line and in
my opinion with proper tools and equipment cleaning and replacing cesium is
doable. Cynics say the manufacturers of tubes could do it but rather sell
only new ones since they are the only source of the much more expensive new
tube. I think that is only half the story.
The reason in my opinion why refurbishing the tube is commercially not
viable is you have to ask: when done what do you really have? You have not
eliminated some of the failure modes, in the case of the 5071 the data in the
EPROM does not necessarily reflect the tube and who could say how long the
tube would last? A crap shoot.
I have a HP 5061 B and a HP 5062 C but eventually want to replace them
totally with a Tbolt-Rb-HP 10811 combination using two digital loops that are
tailored to the devices. I am now focusing on the thermal management in
order to get maximum performance. There is work going on by some members of
the list to develop more sophisticated digital loops. Lets face it, with GPS
properly used, having a Cesium Standard will give you the warm feeling
that you have a primary standard.
By the way that is why I repeatedly have asked the list if there is any
long term Tbolt data out there comparing the 1 PPS or the 10 MHz with a Maser.
I hope this is worth two cents.
Bert Kehren
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