I had this (I mean the pic with the 8) on several IN-18 Tubes, it was cathode poisoning, at least I thik it was. The tube were sold as NOS, 1979. All could be regenerated by a higher current for several hours, each digit.It works good again since 2 months. I did it with the very professional and nice device from ebay:
Professional Nixie Tube Tester & Healer - For All Nixie Tubes <http://rover.ebay.com/rover/0/e11400.m1842.l5919/7?euid=524e176eb8cd4e59888365ca4e79a239&bu=43181414824&loc=http%3A%2F%2Fpayments.ebay.de%2Fws%2FeBayISAPI.dll%3FViewPaymentStatus%26transId%3D1867615175016%26itemId%3D262483292894%26qu%3D2&sojTags=bu=bu> Artikelnr.: 262483292894 , nixie_ninja I'm not the seller of the device. The result is not 100% but good. Am Freitag, 8. Juli 2016 20:48:04 UTC+2 schrieb Jeff Walton: > > 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. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/ad2e8bfc-7e02-4e9c-a82d-0dc01a6c6b20%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
