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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