I had same failure, but probably due to my rotating tubes. I plan to make
an adapter plug to relieve the strain on the pins when I rotate the tubes.
-Dan
On Fri, 8 Jul 2016, Jeff Walton wrote:
I recently had a IN-18 failure in a clock after about 2.5 year operation.
Over a (4) day period, the digits in one of the tubes stopped working in
PWM dimmed mode. At full brightness, the digits in the affected tube
slowly lost percentages of digit coverage to where only portions of each
digit would illuminate. At the end of the observed period, the digits in
the failing tube went completely dark and even higher voltage on the bench
would not illuminate any of the cathodes. The tube date code was 8505.
I am guessing that absent of any other signs of damage, a seal around one
of the pins has failed and allowed the tube to leak. It was surprising how
quickly it failed and none of the other tubes in the same clock have
exhibited any signs of trouble and look as good as the first day of
operation. Has anyone experienced similar failures with the IN-18? Is
this a typical failure mechanism? Have there been any particular date
codes that others have found to be problematic?
The tube has been since been replaced and the clock is happy again but
curiosity leads me to ask about this experience to the rest of the members
of the group. FYI - these tubes have not been rotated since the clock was
initially put into operation (no handling). There was never any evidence
of cathode poisoning during the operation of the clock.
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