{"id":819,"date":"2016-05-10T21:03:11","date_gmt":"2016-05-10T20:03:11","guid":{"rendered":"http:\/\/storycase.co.uk\/radio\/?p=819"},"modified":"2018-06-09T22:14:04","modified_gmt":"2018-06-09T22:14:04","slug":"nixie-tube-in-8-failure","status":"publish","type":"post","link":"https:\/\/storycase.co.uk\/radio\/common-faults\/nixie-tube-in-8-failure\/","title":{"rendered":"Nixie tube IN-8 failure"},"content":{"rendered":"

My retro digital clock has developed a fault after running continuously for over seven or more years. The problem started with the minutes\u00a0Nixie tube that displayed a faint 1 when 5 was on. As a quick fix I swapped it with the hours decade so the 5 was not used and it’s been fine for several months.<\/p>\n

But now it just glows at the base when trying to display 1. As you can see from the pictures it looks rather sad.<\/p>\n

\"Nixie

Nixie clock with faulty decade hour indicator<\/p><\/div>\n

\"Nixie

Close up showing glow at base of Nixie tube<\/p><\/div>\n

 <\/p>\n

A quick Google search reveals this is not an uncommon failure for these OTK IN-8 tubes. With a date code of December ’92, they are nearly 25 years old and probably used stock when I bought the clock.<\/p>\n

\"OTK<\/p>\n

I tried measuring the resistance between all pins and found a low reading of\u00a01.4k\u03a9 between pins 1 and 5 (cathodes for 1 and 5 digits). Expectation was an infinite resistance at the low voltage from my multimeter. Several taps of the tube on a craft mat removed the reading but the fault remained. Strangely no low resistance was found between any other pins (pin 11 is the common anode). So the fault must lie within the tube – possibly a faulty cathode connection to the wire 1 digit. All the remaining digits work with the addition of a small dot at the base of the 5 which could be a fine piece of wire filament.<\/p>\n

Now to find a replacement. The Nixie tubes fitted to my clock have pins making it easy to replace a tube just like a valve. There are several eBay suppliers based in the Russian federation or Ukraine but most sell the wired versions and sets of six for a whole clock at around \u00a350 with shipping. A bit steep for one tube that may arrive broken…<\/p>\n

\"Nixie<\/p>\n

Maybe I’ll wait and hope to find a local source – if you know of supplier or have one to sell please let me know \ud83d\ude42<\/p>\n

Update: Spare tube ordered and arrived from Ukraine in just over a week and it’s working again. As expected new old stock with\u00a0date code ’83 and seems fine.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

My retro digital clock has developed a fault after running continuously for over seven or more years. The problem started with the minutes\u00a0Nixie tube that displayed a faint 1 when 5 was on. 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