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raygungothic
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« on: September 29, 2009, 09:43:37 AM »

You may be interested to know that, despite the high voltages involved, wiring the nixie tube's anode and a cathode the wrong way 'round will still almost work (except on the digit serving as the anode) and does not appear to cause permanent damage. Full function is restored when the error is corrected.

d'oh!

Ray: making stupid mistakes, so you don't have to.

(Don't try this at home. But, if you do, don't think all is lost.)

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nonentity
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« Reply #1 on: September 30, 2009, 02:14:36 PM »

You may be interested to know that, despite the high voltages involved, wiring the nixie tube's anode and a cathode the wrong way 'round will still almost work (except on the digit serving as the anode) and does not appear to cause permanent damage. Full function is restored when the error is corrected.

d'oh!

Ray: making stupid mistakes, so you don't have to.

(Don't try this at home. But, if you do, don't think all is lost.)



Oh yeah, I've done that. Don't worry, it won't hurt them.  That's actually a remedy for spotty cathode contamination I read about someplace.  Don't know offhand where the article is, but if a tube has been direct driven and left on a single digit for a loong period of time, that cathode gets weak, contaminated, etc,  and running it backwards for a bit helps restore it to bright shiny orange.

It' won't asplode them in your face, you should be good to go.  Even though they're delicate, they can be hearty lil buggers.
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nonentity
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raygungothic
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« Reply #2 on: October 01, 2009, 03:50:14 AM »

Ah! I knew about cathode poisoning, and I'd read something about how to cure it but I'd not understood. Now I get it, thank you. Using a cathode as the anode presumably drives off the accumulated crud that was making it dim and patchy in the first place. I imagine that prolonged reversal would cause a shorter life, but at least it's not so hard to detect (since the accidental anode doesn't work properly).

The more I learn about this technology, the more I love it.

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