Trumpter;
You can rejuvenate them if it isn't an outgas problem.
I haven't had any tubes fail on the Spectrum 18, which has fairly loose socket
pins, but I have lost 2 to seal failures on the Blue Dream clock, which has
the really tight pin "cups". I've also had a couple of tubes that have showed
cathode poisoning which have been rejuvenated and are still OK after about 8
months of operation.
To rejuvenate, run the failing digits, one at a time, on a power supply at
170-180vdc that lets you apply 8-10mA to the cathodes at that are partial and
that may clear the deposits. Some say it is OK to use 2-4x the rated current
but I try to go easy. If it is truly cathode poisoning, it could take care of
the problem for a long time. If a pin seal is failing, you may not be able to
clear the cathodes and the tube will get progressively worse until all digits
fail. The process could take minutes or hours for each digit. Check from
time to time by lowering the current back to 3-4mA to see if they are cured at
the regular current.
Spares are also a good solution...
Jeff
-------- Original message --------
From: Trumpeter <[email protected]>
Date: 2/18/17 9:58 PM (GMT-06:00)
To: neonixie-l <[email protected]>
Subject: Re: [neonixie-l] In18 displaying cathode poisoning after 1000hrs or
less.
Oh well I guess I'll run them until the digits are unreadable. Just bummer
given the cost of a new set, nothing cool is cheap these days.
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