IN-1 cathode poisoning after 2 months, even with number rotating every minute

celzey11

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Sep 25, 2020, 12:47:43 PM9/25/20

to neonixie-l

Well, that didn't take long. I knew this would happen eventually but wasn't expecting it this soon. On the plus side in normal clock operation it still looks great. I have so many IN-1s I figure it's better enjoying them in use than have them collect dust, even if they get a little poisoning. I'm gonna see how long the tubes last before the digits in use for displaying the time start to get affected.

celzey11

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Sep 25, 2020, 12:50:05 PM9/25/20

to neonixie-l

https://postimg.cc/xJMQr1TD

Weirdly it's not letting me upload images anymore, so I had to link it.

gregebert

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Sep 25, 2020, 2:45:52 PM9/25/20

to neonixie-l

I'm amazed you didn't have any shorted cathodes. I had that happen on several of mine and I gave up using them, except for an occasional ride in the microwave oven. Also, I'm not a fan of the upside-down-2 used as a '5'.

Have you tried depoisoning at higher current, say 8-10mA ?

Funny thing about the IN-1 is the sockets cost more than the tube !

celzey11

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Sep 25, 2020, 4:48:18 PM9/25/20

to neonixie-l

Nope they're being driven off a cheapo Chinese IN-12 kit providing 2.5ish MA direct drive

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