I appreciate the sellers that post photos of the actual tubes operating.
I've bought from postings without operating photos and in the past few years I
have had about 10% with issues or poisoning of segments. I've been able to
bring back all of the poisoned segments but haven't tried to "fix" shorted
segments. Not much can be done with opens.
The tubes with the post (that I have) do not have mica spacers touching the
glass at the top. I'll dig them out and post a couple photos.
Jeff
-------- Original message --------
From: Michail1 via neonixie-l <neonixie-l@googlegroups.com>
Date: 3/6/2016 5:03 PM (GMT-06:00)
To: neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] Bad B7971's
Jeff,
Sorry, I have not taken notes as to which the tubes were, although I have
both types. I did look at some to see that the ones WITH the needle still
have the mica spacers at the top. So, you should still be fine smacking
them around.
The tubes with the little space needle uses wire coming up from the bottom
to the clips. The ones without the needle have the type of circuit board
going up to the clips. I believe the last two tubes I was 'playing' with
are disconnected at the clip to the element (not the circuit/wire to the
clip).
I could take pictures when I get to work of various tubes if you're looking
for something specific.
There is a market. You can post on ebay as people still want them,
but I highly suggest you be honest with an element being bad and light it
up.
Michail
In a message dated 3/6/2016 1:47:41 P.M. Pacific Standard Time,
jwalton...@gmail.com writes:
Michail,
Thanks for the
explanation and photos of the 7971 tubes. I have several that I will try
to “repair” based on seeing what you have been able to fix. There are
some of the early 7971 tubes that use a thin rod to the top of the tube for
support instead of the mica spacers and they may not respond too well to
shock. The later tubes (64 and later) which have partial or full mica
spacers holding everything (top and bottom) should be fairly robust.
Have you noticed any more or less issues with the circuit board backplane vs
the wire interconnect versions?
I also have a
couple tubes with a dead segment where I can visually see an open wire from
the pins to the segment. Wasn’t thinking there was much of a market for
them but maybe for someone building a clock where the tens-hours is either
one
or zero might be able to use them. Much depends on the font that is
being used.
Jeff
From:
neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com]
Sent: Sunday, March 06, 2016 12:04 PM
To:
neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] Bad
B7971's
Thought
I would share, althought I might have
already.
Last
purchase on ebay was a sign which was made up of 7 tubes and says 'GO
AWAY' or 'WELCOME' depending on the position of the switch. 6 more tubes
were to come with it.
Well,
I took video of opening the 2 boxes just because of experience with prior
ebayers. They were labeled from 1 - 13. Well, there was only 12
tubes in the boxes (tube #12 was missing). A slight resistance from the
seller, but it was hard to dispute video of the opening and counting of the
items.
Of
the 12 tubes, 3 were overlapping and 1 had a bad
segment.
Here
are those 3 tubes:
https://www.dropbox.com/s/gkilytpol75hkpg/2015-12-05%2014.05.19-Mark.jpg
Also,
a prior purchase of 6 tubes had 2 bad ones in it:
https://www.dropbox.com/s/lcuilr9axdssz1y/7971-Tube-Short.jpg
Michail
In a
message dated 3/6/2016 9:15:19 A.M. Pacific Standard Time,
nickst...@gmail.com
writes:
I
took a look at the cathodes under a good magnifier and a few of them you
can
definitely see are physically overlapping in the center of the segments and
no deal of smacking the tube can get them to move...;-( I'll PM you later
today. I will measure the resistance of the less obvious ones too, thanks
for the hint!
Cheers,
Nick
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