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 Post subject: Interesting Tubes
PostPosted: Jul Tue 23, 2019 6:53 pm 
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Made a deal for a few pieces of equipment, and a large box of tubes,.. These were in the box.. Nixies,.. Don't know much more than that..
Ultronic, and Burroughs 7971..
Stan


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 Post subject: Re: Interesting Tubes
PostPosted: Jul Tue 23, 2019 7:27 pm 
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One way to show one's age: "I know what a Nixie tube is."
Another way: "I worked at Burroughs when they were building the B6500 computer."

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Wed 24, 2019 4:46 pm 
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pixellany wrote:
One way to show one's age: "I know what a Nixie tube is."
Another way: "I worked at Burroughs when they were building the B6500 computer."


My mother also worked as an assembler at that same (Pasadena, CA) Electro-Data computer division. Plus several more relatives worked there, too.

Back to the nixies, which were made in Plainfield, NJ. Here is some more info, on that particular alphanumeric ("British flag") tube:

http://www.tube-tester.com/sites/nixie/ ... /b7971.htm

Ultronic made the system, and electronics, that used those tubes. They were installed in stock brokerage houses, but not in a major exchange, as far as I've read.

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Thu 25, 2019 2:54 pm 
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I know nothing about Nixie tubes.. I have six of these "7971".. Before I list them, I would like to make sure they are good tubes.. Is there an easy way to test these?? I have one that appears to have a haze on the inside of the tube..

Stan

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Thu 25, 2019 4:51 pm 
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pixellany wrote:
One way to show one's age: "I know what a Nixie tube is."
Then you should know the tube in the photos is NOT a Nixie.

It's electroluminescent rather than neon.

- Leigh

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Thu 25, 2019 8:50 pm 
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Quote:
Is there an easy way to test these??


Sadly, no. You almost need a piece of equipment that uses them, to test them. It'd be possible to rig up a bench tester, but you'd have to apply the proper voltages to the proper pins to test all the elements, or possibly wire them all together and then see if they light up, but you'd still to make some kind of test rig to do it.

They're not all equal...as noted above, one of yours is not a nixie, but an EL indicator, which requires much different voltages.

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 1:51 am 
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These tubes were used at the New York Stock Exchange as they are alpha numeric. I always say the next clock I will build is one with the B-7971 tubes.

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 10:46 am 
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This is what I have.. I have not opened all of them, and I have no idea if NOS or used.. I ran across a diagram for a test rig for testing these.. I don't know if I want to go that route.. I may contact a place here locally, that deals tubes, and see if they want them..

Stan

btw: the pictures in my first post are of the same tube, front and back


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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 11:24 am 
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Germane:

https://archive.org/details/73-magazine ... /page/n187

Cheers,

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 12:12 pm 
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Leigh wrote:
pixellany wrote:
One way to show one's age: "I know what a Nixie tube is."
Then you should know the tube in the photos is NOT a Nixie.

It's electroluminescent rather than neon.

- Leigh

Nitpick noted......

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 1:27 pm 
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Ntpick Burroughs.....they call them Nixies....

https://archive.org/details/TNM_Burroug ... 30/page/n3

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 2:00 pm 
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So,.. Are people really paying what I've seen for these ?? Seems crazy to me..

http://mikeday.net/xmit/b7971.htm


Stan

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 2:12 pm 
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Um, yes. I sold two 7919 used tubes in 2011 for $191

NIB? expect 2X that on the 'bay.

I see $180 each, easily.

https://www.ebay.com/sch/i.html?_from=R ... Complete=1

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 2:19 pm 
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This leaves me in a quandary.. I have no need for them, but I need to know that they function before I offload them..
Humm,.. what to do..


Stan

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Fri 26, 2019 3:47 pm 
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My first post shows includes a link to a 73 magazine article that shows how to illuminate them - very simple circuit.

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73.jpg
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Me? I clipped the leads to my LC102 LCR meter to the anode and cathodes to show that all the elements lit. Any 190V current limiting supply capable of producing 45mA or more will do. I used a 10K resistor in series, but shifted to something lower, IIRC. My auction drew over a dozen different bidders, and sold to a South Korean.

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 Post subject: Re: Interesting Tubes
PostPosted: Jul Sat 27, 2019 8:38 pm 
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A few years ago I got 4 for $300 off of eBay, seems cheap now. I also got a couple with a funky segment or 2 for $20. 8)

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 Post subject: Re: Interesting Tubes
PostPosted: Aug Sun 11, 2019 4:17 pm 
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Rigged up something this morning,.. and tested one..


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Capturetv.PNG
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 Post subject: Re: Interesting Tubes
PostPosted: Aug Mon 12, 2019 12:14 pm 
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Build a clock with them.

Could use a standard nixie clock circuit only replacing the HV drivers with BCD to 7 segment decoders and HV transistors to drive the elements.


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 Post subject: Re: Interesting Tubes
PostPosted: Aug Mon 12, 2019 3:36 pm 
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As much as I like clocks,.. they are going to be listed asap..

Stan

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 Post subject: Re: Interesting Tubes
PostPosted: Aug Thu 15, 2019 1:08 pm 
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I still use a Heathkit IB-1103 frequency counter from the 1970s, that has Nixie tubes.

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