Wanted - a quantity of faulty B7971s

[Tony Adams]

Hi all,
I hope you won't mind me asking but I'm looking for a large quantity
of reject B7971s for a future project, a minimum of 32 but the more
the better, if I can find 64 that would be ideal.
I'm mostly interested in tubes with missing segments but would
consider hard to start as well as they may do what I need. Cracked or
gassy are no use - it needs to light up.
I know it's not going to be easy finding this many but with luck
eventually I should be able to put a set together.

Tony.

[John Rehwinkel]

> I'm mostly interested in tubes with missing segments but would
> consider hard to start as well as they may do what I need. Cracked or
> gassy are no use - it needs to light up.

You tempt me to take one of my cracked ones and hook it up to
several kilovolts - it'll light up.

- John

[Mich...@aol.com]

Tony,

 

I may be able to help as I have at least 22 bad tubes.  Just need to decide on if I can get rid of them yet.

 

Will start retesting shortly to find the ones that light up although I only have a few that lit.  Will update you.

 

Might be hard to find a person that has 64 (good or bad) let alone willing to give them up.  Heh.

 

Michail

 

In a message dated 9/4/2012 7:48:21 A.M. Pacific Daylight Time, sa...@amt-electronics.com writes:

Hi all,
I hope you won't mind me asking but I'm looking for a large quantity
of reject B7971s for a future project, a minimum of 32 but the more
the better, if I can find 64 that would be ideal.

I'm mostly interested in tubes with missing segments but would
consider hard to start as well as they may do what I need. Cracked or
gassy are no use - it needs to light up.

[Adam Jacobs]

I was thinking of that as well... What is the voltage needed to cause
ionization in air?

-Adam

[Tony Adams]

Ha :)

At atmospheric it's more a matter of breakdown voltage though any
remaining mercury vapour will lower it. A little too much UV I think
from those tubes, really prefer orange....

Tony.

[Tony Adams]

Hi,
I know they're part of an ongoing dispute so I'll just have to wait
and see but wondered if any more might be out there as I'll still need
to find quite a few to make up 32.
64 probably wasn't going to happen but if you don't ask you never
know, I'll be happy with 32 and if anyone else ever wants a set I'll
just supply the parts and let them source their own tubes.
I really don't want to use good tubes for this though as it'll
encourage me to add more 'features' to make full use of them.

Tony.

[kay486]

May i ask what exactly are you planing to do with them?

[Tony Adams]

I'd prefer not to say just yet, if it works as well as I hope then
it'll be public, otherwise It makes it easier to hide the embarassing
failure ;)

Tony.

[kay486]

Keep your eye on this (im not realted to the auction anyhow) http://www.ebay.com/itm/LOT-OF-20-LARGE-BURROUGHS-ULTRONIC-B-7971-NIXIE-COUNTER-TUBE-10-DRIVER-BOARDS-/320997749249?pt=Vintage_Electronics_R2&hash=item4abcf4f201

[David Forbes]

On 10/8/12 10:02 AM, kay486 wrote:
> Keep your eye on this (im not realted to the auction anyhow)

> http://www.ebay.com/itm/320997749249

Thanks for the link! I've saved the images for reverse engineering the
PC boards later.

Those boards (with tubes!) sold for $5 each in the mid 1970s...

http://www.nixiebunny.com/b7971ad.jpg

--
David Forbes, Tucson AZ

[kay486]

I wonder do the B7971 use the same sockets as Z568M ?

[Tony Adams]

Currently I'm still looking for another 10 plus a couple of spares,
buying them at full price wouldn't be worth it and be a waste of good
tubes to just sit there displaying a static pattern.

Tony.

On Oct 8, 6:02 pm, kay486 <luckyl...@gmail.com> wrote:
> Keep your eye on this (im not realted to the auction anyhow)http://www.ebay.com/itm/LOT-OF-20-LARGE-BURROUGHS-ULTRONIC-B-7971-NIX...

[5-ht]

There is an image of the schematic of this board on the old Yahoo Neonixe website. It's not great quality but I think most of it can be made out. Certainly better than starting over from scratch.
The file is named b7971board.djvu and can be found here (for those who still have access):
http://groups.yahoo.com/group/NEONIXIE-L/files/Nixie%20Tube%20Data/

Mark

[kay486]

another huge auction
http://www.ebay.com/itm/Nixie-Alphanumeric-Large-Vacuum-Tubes-B-7971-X18-Burroughs-Lot-Of-18-15-Sockets-/290823569956?pt=Vintage_Electronics_R2&hash=item43b66f8224

On Tuesday, 4 September 2012 15:48:19 UTC+1, Tony Adams wrote:

[Tony Adams]

They'll sell for an equally huge price, plus even huger (;)) taxes so
no use for our project.

We have about 22-23 up to now so still looking for more, another 10
should be enough to build the first, then we just need another 32 for
the second....

Tony.


On Nov 30, 6:41 pm, kay486 <luckyl...@gmail.com> wrote:
> another huge auctionhttp://www.ebay.com/itm/Nixie-Alphanumeric-Large-Vacuum-Tubes-B-7971-...

[kay486]

You still havent told us what are you building. Im really curious. 32 tubes for one *thing*

[Bryan Goines]

I have the same question. What are you using 32 tubes for one project? :-)

-- 

Bryan Goines

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[Terry Kennedy]

On Nov 30, 3:13 pm, Bryan Goines <bryan...@gmail.com> wrote:
> I have the same question. What are you using 32 tubes for one project? :-)

I know! It's a mock-up for a new kind of stock ticker system, right?
8-}

[Tony Adams]

When - or if - I find enough tubes and build it this will be the first place I post a link to the photos ;)

A seperate question though - are there any of the original ticker displays left intact or were they all scrapped?.

Tony.

[Mich...@aol.com]

I have never seen the frame posted for sale, but I have about 30 of the modules available.

 

Michail

When - or if - I find enough tubes and build it this will be the first place I post a link to the photos ;)

A seperate question though - are there any of the original ticker displays left intact or were they all scrapped?.

Tony.

[Raymond Weisling]

I have two B-7971 with bad segments. They were working well for many years (bought them  in 1974), I used them to check assembled products in a 12-24 hour burn-in test, but eventually they each developed a bad segment. I didn't handle then roughly at all. Strange.

There was one fellow who had a complete display unit from a broker. Before my website went down (didn't have a way to renew the domain name) there was a page with photos. Let me see if I saved any info anywhere. Need to do some digging.

-- ray

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