[time-nuts] evaluation of 5071a(hp)

[Richard (Rick) Karlquist]

 From what I remember from the years I worked
on the 5071A is that the prognosis for CBT's
in long term storage is very poor.  The Navy
had to scrap a bunch of them due to this problem.
I vaguely remember that the pressure got too high
for the ion pump to start.  If it does start, I
think ion current is an indicator of vacuum.  In
marginal cases there are tricks for starting the
ion pump.  This is all I remember hearing anecdotaly,
maybe others can chime in.  This problem is the
same as for the 5061 CBT.

Rick Karlquist N6RK

David Welch wrote:
> I am new to this forum and was wondering if someone would know how to check if the tube in a agilent 5071a is any good.these units are new in box but have been in storage many years(bad idea)..is there anything to look at during start up to give you an indication of outgassing ar vacum loss? could a tube that locks now fail in a few weeks of use even if new but stored without power for years?IF anyone has any suggestions let me know ..thanks..David
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