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
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
> I’ve purchased many of the tubes which were ‘pulls’ and they were all wrapped
> in newspaper from 1970-1972 - I still have the newpaper wrappings.
A seller named "USquarters" sold a vast number of tubes wrapped in newspaper
like that, that's where I got most of mine, years ago.
- John
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> I was cleaning the office with all my "spare time" and found this!
>
> Date code 1974!
>
> Should I restore or scrap for a tiny VFD clock?
If you end up scrapping it, I'd be interested in the IC or the board if you
don't want to remove the IC.
- John
--
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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
The first link shows a little poisoning on the underscore.
The second link is mine. They went for $220 a tube.
I only posted for those people that really really really need one. (Did expect
a purchase of more than 1 at a time.)
I will post more, but again, only meant for people that don’t want
One of the two tubes is the rarer antenna tube. They made much less of
them. I actually try and avoid them because they don't match my others. I
have close to 30 tubes now and a bunch of clocks. I think Michail almost
had enough of the antenna tubes to make a clock with them maybe? I just
Looking excellent, are you far away from production boards for selling?
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another b7971 on ebay todayfirst day already over 180USD per tube...
https://www.ebay.com/itm/Two-Giant-15-segment-Burroughs-B-7971-Nixie-Tubes-with-sockets/303531498958?hash=item46abe31dce:g:n~0AAOSw7MNeh~rG
You still have to be careful with these all-segments-lit-up photos, as I
think it would be a great way to disguise the fact that multiple segments
could be stuck on together. I have of couple of B-7971s that have two
segments that come on together due to some kind of internal short, and no
amount
There was a post a little while ago about two Nixie's that appeared on eBay
that are now priced $360 for two. The post was deleted so I cannot reply to
it. I was wondering what is the test module that is powering the tubes
demonstrating that all segments are functional? I tried a bit of Google
another b7971 on ebay todayfirst day already over 180USD per tube...
https://www.ebay.com/itm/Two-Giant-15-segment-Burroughs-B-7971-Nixie-Tubes-with-sockets/303531498958?hash=item46abe31dce:g:n~0AAOSw7MNeh~rG
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