Re: [neonixie-l] 7971 nixie tube problem

[Terry S]

That vintage clock is interesting indeed. Built from a 1976 article in 73 
magazine. You can read part of the article. The author discusses the 
voltage rating of the transistors, notes that he has no data ... and 
"inquiries among friends and on the nets failed" 

On the nets? Was that perhaps ham radio lingo in the 70's? Or was he 
portending the future?

Also, he paid $5 for the 6 nixies and the driver boards.

Terry

On Friday, September 8, 2017 at 6:11:47 AM UTC-5, Paul Andrews wrote:
>
> The same seller has an empty school display board for sale that takes 15 
> of those tubes, so he picked up two of them?
>
> There is also this clock with six tubes in it that I am surprised is still 
> for sale: https://www.ebay.com/itm/122680353656 
>
> (Sorry, don't mean to hijack this thread)
>
>

-- 
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/4e179550-0ceb-4612-bf7b-f111e9315fec%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Paul Andrews]

The same seller has an empty school display board for sale that takes 15 of 
those tubes, so he picked up two of them?

There is also this clock with six tubes in it that I am surprised is still for 
sale: https://www.ebay.com/itm/122680353656 

(Sorry, don't mean to hijack this thread)

-- 
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/aa4d8415-a8cd-408e-b691-a7a7bc9c4d1f%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Nicholas Stock]

Speaking of B7971 tubes...

http://www.ebay.com/itm/good-burroughs-b-7971-nixie-tubes-qty-available-/232480774966

I have a hunch I know where these came from and how much was paid for them
too.but that's irrelevant. 30 tubes for sale though!

Not my auction etc etc...

Cheers,

Nick

On Thu, Sep 7, 2017 at 3:10 PM, Jeff Walton  wrote:

> Wow, that's really odd - and really bad luck.  My original B7971 tubes
> survived 40 years in moving boxes from home to home with no real special
> protection and have worked well after being put into a clock about 3 years
> ago.  I can't understand what would cause the glass to do this in a regular
> environment.
>
>
>
> -Original Message-
> From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
> Behalf Of Clarke Payne
> Sent: Thursday, September 7, 2017 11:23 AM
> To: neonixie-l
> Subject: [neonixie-l] 7971 nixie tube problem
>
> I have run across some 7971s I have had stored for 30 yrs. 3 of the 12
> glass envelopes fractured when I picked them up. One just
> disengrated.others seemed good cleaned up ok havent tested yet but appear
> to be in sound shape. Anyone run into this problem. Any special precautions
> before I test them?
>
> --
> 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/1d2134a5-ad2d-4b6a-a6d1-90ccf30da6f9%40googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
> --
> 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/59b1c419.88e1240a.2d98.0a0c%40mx.google.com.
> For more options, visit https://groups.google.com/d/optout.
>

-- 
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/CAOX%2BRHLh5S-L%2BLwgDKfw0Z6bqxdEZSj2J6Fx6S4hYAGEnukXBA%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

RE: [neonixie-l] 7971 nixie tube problem

[Jeff Walton]

Wow, that's really odd - and really bad luck.  My original B7971 tubes survived 
40 years in moving boxes from home to home with no real special protection and 
have worked well after being put into a clock about 3 years ago.  I can't 
understand what would cause the glass to do this in a regular environment.  



-Original Message-
From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Clarke Payne
Sent: Thursday, September 7, 2017 11:23 AM
To: neonixie-l
Subject: [neonixie-l] 7971 nixie tube problem

I have run across some 7971s I have had stored for 30 yrs. 3 of the 12 glass 
envelopes fractured when I picked them up. One just disengrated.others seemed 
good cleaned up ok havent tested yet but appear to be in sound shape. Anyone 
run into this problem. Any special precautions before I test them? 

-- 
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/1d2134a5-ad2d-4b6a-a6d1-90ccf30da6f9%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

-- 
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/59b1c419.88e1240a.2d98.0a0c%40mx.google.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[gregebert]

I was thinking thermal-cycling; if they were stored in a garage or attic 
for 30 years where temperature is unregulated, it could cause a lot of 
thermal cycles. Imagine if there was something like a clothes-dryer, 
furnace, or water-heater nearby; they would cause a lot of thermal cycles 
over 30 years. These are large tubes, so they will be more vulnerable than 
smaller tubes.

Next on my list would be vibration; if the tubes rattled inside their box, 
or against eachother, it could weaken them.

I dont know of any house-hold chemical that would attack the glass itself; 
Hydrofluoric acid is the only substance I know of that etches glass.

-- 
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/24e6e550-9f6e-480f-9f5f-b025d089ce46%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Tomasz Kowalczyk]

The glass needs to have high tension in it to break like that. This is 
interesting, I've broken few tubes in my life and they all crack like 
standard glass (big pieces and small amount of small shards). 
Combining this with fact that the breaking ones had no marking leads me to 
a crazy idea - maybe these were samples meant to have higher endurance and 
that's why there was tension introduced into the glass on purpose, just 
like in car windows? Toughened glass can take harder hits from the outside. 
It seems they weren't more durable on the long run. 


W dniu czwartek, 7 września 2017 21:13:29 UTC+2 użytkownik Clarke Payne 
napisał:
>
> Yes one like a car window only with no glue. The other 2 developed 
> hairline cracks when picked up.  Ira will check further when I get back 
> home. May be knock offs but who would have made them?
>
> Clarke 
>
> Sent from Verizon Note 2
> 
>
> On Sep 7, 2017 2:52 PM, "Tomasz Kowalczyk"  > wrote:
>
>> What do you mean by "disintegrated"? Did it break into thousands of 
>> pieces, like a car window?
>>
>> W dniu czwartek, 7 września 2017 19:32:45 UTC+2 użytkownik Clarke Payne 
>> napisał:
>>>
>>> as far as I can tell temperature changes were not "radical".  packed in 
>>> solid thick plastic case with no stress. tube pins look straight. will 
>>> check with magnifying glass. ones that broke when I picked them up 
>>> developed hairline cracks immediately.  one just disengrated. when I get 
>>> home will post pics and on the others will do a comparison of segments. 
>>> Thank you guys for your input. will do some more investigation. the only 
>>> other thing that may be remarkable is the broken ones have no markings. the 
>>> unbroken ones have the Burroughs b-7971 stamp.
>>>
>>> Clarke 
>>>
>>> Sent from Verizon Note 2
>>> 
>>>
>>> On Sep 7, 2017 1:07 PM, "gregebert"  wrote:
>>>
 I had none in storage, and the ones I purchased in the past year had no 
 signs of stress. Is it possible yours were damaged in storage ? I've never 
 seen glass weaken on it's own. Also, the pins are fairly rigid (unlike 
 IN-18's which are quite soft) so if there are any bent ones, it suggests 
 the tube was stressed while stored.

 I suggest you carefully inspect the base for glass-cracks, then 
 bench-test them. If you are into data-collection, I suggest gathering I-V 
 data for each segment on each tube, then plotting and comparing. It takes 
 a 
 bit of time, but I'm glad I did it for mine.


 -- 
 You received this message because you are subscribed to a topic in the 
 Google Groups "neonixie-l" group.
 To unsubscribe from this topic, visit 
 https://groups.google.com/d/topic/neonixie-l/JI3olwmKrh8/unsubscribe.
 To unsubscribe from this group and all its topics, send an email to 
 neonixie-l+...@googlegroups.com.
 To post to this group, send email to neoni...@googlegroups.com.
 To view this discussion on the web, visit 
 https://groups.google.com/d/msgid/neonixie-l/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com
  
 
 .
 For more options, visit https://groups.google.com/d/optout.

>>> -- 
>> You received this message because you are subscribed to a topic in the 
>> Google Groups "neonixie-l" group.
>> To unsubscribe from this topic, visit 
>> https://groups.google.com/d/topic/neonixie-l/JI3olwmKrh8/unsubscribe.
>> To unsubscribe from this group and all its topics, send an email to 
>> neonixie-l+...@googlegroups.com .
>> To post to this group, send email to neoni...@googlegroups.com 
>> .
>> To view this discussion on the web, visit 
>> https://groups.google.com/d/msgid/neonixie-l/8e00b25f-08f5-41b5-9d36-59d8417068fe%40googlegroups.com
>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>

-- 
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/2328f3c1-e5f4-4a12-a199-31e825e4844d%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Clarke Payne]

Yes one like a car window only with no glue. The other 2 developed hairline
cracks when picked up.  Ira will check further when I get back home. May be
knock offs but who would have made them?

Clarke

Sent from Verizon Note 2


On Sep 7, 2017 2:52 PM, "Tomasz Kowalczyk"  wrote:

> What do you mean by "disintegrated"? Did it break into thousands of
> pieces, like a car window?
>
> W dniu czwartek, 7 września 2017 19:32:45 UTC+2 użytkownik Clarke Payne
> napisał:
>>
>> as far as I can tell temperature changes were not "radical".  packed in
>> solid thick plastic case with no stress. tube pins look straight. will
>> check with magnifying glass. ones that broke when I picked them up
>> developed hairline cracks immediately.  one just disengrated. when I get
>> home will post pics and on the others will do a comparison of segments.
>> Thank you guys for your input. will do some more investigation. the only
>> other thing that may be remarkable is the broken ones have no markings. the
>> unbroken ones have the Burroughs b-7971 stamp.
>>
>> Clarke
>>
>> Sent from Verizon Note 2
>>
>>
>> On Sep 7, 2017 1:07 PM, "gregebert"  wrote:
>>
>>> I had none in storage, and the ones I purchased in the past year had no
>>> signs of stress. Is it possible yours were damaged in storage ? I've never
>>> seen glass weaken on it's own. Also, the pins are fairly rigid (unlike
>>> IN-18's which are quite soft) so if there are any bent ones, it suggests
>>> the tube was stressed while stored.
>>>
>>> I suggest you carefully inspect the base for glass-cracks, then
>>> bench-test them. If you are into data-collection, I suggest gathering I-V
>>> data for each segment on each tube, then plotting and comparing. It takes a
>>> bit of time, but I'm glad I did it for mine.
>>>
>>>
>>> --
>>> You received this message because you are subscribed to a topic in the
>>> Google Groups "neonixie-l" group.
>>> To unsubscribe from this topic, visit https://groups.google.com/d/to
>>> pic/neonixie-l/JI3olwmKrh8/unsubscribe.
>>> To unsubscribe from this group and all its topics, send an email to
>>> neonixie-l+...@googlegroups.com.
>>> To post to this group, send email to neoni...@googlegroups.com.
>>> To view this discussion on the web, visit https://groups.google.com/d/ms
>>> gid/neonixie-l/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com
>>> 
>>> .
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>> --
> You received this message because you are subscribed to a topic in the
> Google Groups "neonixie-l" group.
> To unsubscribe from this topic, visit https://groups.google.com/d/
> topic/neonixie-l/JI3olwmKrh8/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> neonixie-l+unsubscr...@googlegroups.com.
> To post to this group, send email to neonixie-l@googlegroups.com.
> To view this discussion on the web, visit https://groups.google.com/d/
> msgid/neonixie-l/8e00b25f-08f5-41b5-9d36-59d8417068fe%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
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/CAP3Ko%3DtxxQUU7deFqAeLd-LYaO0g6%3D-YLvRNsP2dYUBxRNJ%2B_w%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Tomasz Kowalczyk]

What do you mean by "disintegrated"? Did it break into thousands of pieces, 
like a car window?

W dniu czwartek, 7 września 2017 19:32:45 UTC+2 użytkownik Clarke Payne 
napisał:
>
> as far as I can tell temperature changes were not "radical".  packed in 
> solid thick plastic case with no stress. tube pins look straight. will 
> check with magnifying glass. ones that broke when I picked them up 
> developed hairline cracks immediately.  one just disengrated. when I get 
> home will post pics and on the others will do a comparison of segments. 
> Thank you guys for your input. will do some more investigation. the only 
> other thing that may be remarkable is the broken ones have no markings. the 
> unbroken ones have the Burroughs b-7971 stamp.
>
> Clarke 
>
> Sent from Verizon Note 2
> 
>
> On Sep 7, 2017 1:07 PM, "gregebert"  
> wrote:
>
>> I had none in storage, and the ones I purchased in the past year had no 
>> signs of stress. Is it possible yours were damaged in storage ? I've never 
>> seen glass weaken on it's own. Also, the pins are fairly rigid (unlike 
>> IN-18's which are quite soft) so if there are any bent ones, it suggests 
>> the tube was stressed while stored.
>>
>> I suggest you carefully inspect the base for glass-cracks, then 
>> bench-test them. If you are into data-collection, I suggest gathering I-V 
>> data for each segment on each tube, then plotting and comparing. It takes a 
>> bit of time, but I'm glad I did it for mine.
>>
>>
>> -- 
>> You received this message because you are subscribed to a topic in the 
>> Google Groups "neonixie-l" group.
>> To unsubscribe from this topic, visit 
>> https://groups.google.com/d/topic/neonixie-l/JI3olwmKrh8/unsubscribe.
>> To unsubscribe from this group and all its topics, send an email to 
>> neonixie-l+...@googlegroups.com .
>> To post to this group, send email to neoni...@googlegroups.com 
>> .
>> To view this discussion on the web, visit 
>> https://groups.google.com/d/msgid/neonixie-l/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com
>>  
>> 
>> .
>> For more options, visit https://groups.google.com/d/optout.
>>
>

-- 
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/8e00b25f-08f5-41b5-9d36-59d8417068fe%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Clarke Payne]

as far as I can tell temperature changes were not "radical".  packed in
solid thick plastic case with no stress. tube pins look straight. will
check with magnifying glass. ones that broke when I picked them up
developed hairline cracks immediately.  one just disengrated. when I get
home will post pics and on the others will do a comparison of segments.
Thank you guys for your input. will do some more investigation. the only
other thing that may be remarkable is the broken ones have no markings. the
unbroken ones have the Burroughs b-7971 stamp.

Clarke

Sent from Verizon Note 2


On Sep 7, 2017 1:07 PM, "gregebert"  wrote:

> I had none in storage, and the ones I purchased in the past year had no
> signs of stress. Is it possible yours were damaged in storage ? I've never
> seen glass weaken on it's own. Also, the pins are fairly rigid (unlike
> IN-18's which are quite soft) so if there are any bent ones, it suggests
> the tube was stressed while stored.
>
> I suggest you carefully inspect the base for glass-cracks, then bench-test
> them. If you are into data-collection, I suggest gathering I-V data for
> each segment on each tube, then plotting and comparing. It takes a bit of
> time, but I'm glad I did it for mine.
>
>
> --
> You received this message because you are subscribed to a topic in the
> Google Groups "neonixie-l" group.
> To unsubscribe from this topic, visit https://groups.google.com/d/
> topic/neonixie-l/JI3olwmKrh8/unsubscribe.
> To unsubscribe from this group and all its topics, send an email to
> neonixie-l+unsubscr...@googlegroups.com.
> To post to this group, send email to neonixie-l@googlegroups.com.
> To view this discussion on the web, visit https://groups.google.com/d/
> msgid/neonixie-l/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

-- 
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/CAP3Ko%3DutRmT5nR-uCAoc-3zcp77b%3DZf8_2OfFw5%2BbxjQDogp8A%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[gregebert]

I had none in storage, and the ones I purchased in the past year had no 
signs of stress. Is it possible yours were damaged in storage ? I've never 
seen glass weaken on it's own. Also, the pins are fairly rigid (unlike 
IN-18's which are quite soft) so if there are any bent ones, it suggests 
the tube was stressed while stored.

I suggest you carefully inspect the base for glass-cracks, then bench-test 
them. If you are into data-collection, I suggest gathering I-V data for 
each segment on each tube, then plotting and comparing. It takes a bit of 
time, but I'm glad I did it for mine.


-- 
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/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

Re: [neonixie-l] 7971 nixie tube problem

[Nicholas Stock]

Fractured when you picked them up? Odd. Have they been exposed to long periods 
of temperature swings in storage? That might make them susceptible. Nothing 
special with regard testing them. Easy check for gas is to hold them next to a 
plasma globebe careful if you need to bend the pins, be gentle as you can 
fracture the glass if you're a bit ham fisted (ask me how I know). I 
presume you have a good device to test them with

Best of luck! They're lovely tubes...

Nick

Sent from my iPhone

> On Sep 7, 2017, at 09:22, Clarke Payne  wrote:
> 
> I have run across some 7971s I have had stored for 30 yrs. 3 of the 12 glass 
> envelopes fractured when I picked them up. One just disengrated.others seemed 
> good cleaned up ok havent tested yet but appear to be in sound shape. Anyone 
> run into this problem. Any special precautions before I test them? 
> 
> -- 
> 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/1d2134a5-ad2d-4b6a-a6d1-90ccf30da6f9%40googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

-- 
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/2086ED97-B7C7-4069-B9E7-4AC284C45493%40gmail.com.
For more options, visit https://groups.google.com/d/optout.