A tube that has sat dormant for a long period can exhibit these issues. The cathodes can pick up surface contamination which will likely clear up if you run them for a day or two. It's not exactly the same as operating cathode poisoning but shows similarly. This is very typical when you get an old nixie. Regular operating keeps the cathode "cleaned". Jeff -------- Original message --------From: christopher helps <chris4cl...@gmail.com> Date: 5/14/18 2:37 PM (GMT-06:00) To: neonixie-l <neonixie-l@googlegroups.com> Subject: [neonixie-l] z568m tubes starting to fail Hello,I have had a six digit nixie clock running on and off for a number of years but today switching it on after being boxed up for a year it is showing signs that some tubes are fading!!?Is this something that can be repaired-by anti poisoning?..is this the first sign that they are on their way out.It seems odd that it was fine before boxing them up then suddenly three of them have some digits with dark areas...any advice would be very grateful
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