I've successfully "repaired" four 7971s with shorted segments. All were in corners where diagonal segments overlapped at the ends. Rough shipping can cause this. I've posted photos on this forum showing the before and after, as well as the way I did it. Others before me posted suggestions of how they did the same thing and convinced me of why I should not give up on an otherwise perfectly good tube. Search the forum for photos and suggestions from several posters. If you can't find them, send me a note and I'll find my examples. Jeff -------- Original message --------From: Richard Scales <rich...@scalesweb.co.uk> Date: 4/5/20 11:44 PM (GMT-06:00) To: neonixie-l <neonixie-l@googlegroups.com> Subject: Re: [neonixie-l] Re: B7971's on the bay.... I am equally hooked. It wont help you much but I had success with removing a short using the banging method - I would not have thought it possible but it worked. I could actually see the change in position of the cathode in question - a little geometry workout in advance ensured I was applying potentially destructive forces in the right direction.Although late to the party I now have all that I need and I find I can quite easily avoid bidding ebay sales for them although I still look out - just in case!On Sunday, 5 April 2020 20:27:54 UTC+1, gregebert wrote:The one-and-only "antenna" version of the b7971 I had in my 8-tube clock failed as shorted segments after 2 years of usage. Not sure if others have seen reliability issues with a particular tube style, but that's my experience. I only use direct-drive, and the clock is well-protected from getting bumped-around so it's a real mystery to me how the cathode segment slipped up-against it's neighbor. I dont have the balls to put my tube at the end of a stick and whack it; Michail Wilson published a photo and has had success. Photo makes me laugh and cry at the same time....I got hooked on 7971's a few years ago, mainly because they are so frigging HUGE. They lack the artistic beauty of a traditional nixie., but are too versatile to be shunned.
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