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# Wanted: Hexadecimal Nixie Tubes or similar display devices

Clive Maxfield
10/21/2011 02:22 PM EDT

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/31/2011 2:22:40 PM
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We thought of octal -- but the machine has a 4-bit data bus and a 12-bit address bus, so hex really is the more intuitive way to go on this one...

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/31/2011 2:21:41 PM
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Apparently there were 15-segment Nixie Tubes that coudl be used to form all of the alpha-numeric characters 0-9 and A-Z ... pretty cool...

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/31/2011 1:56:42 PM
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Clive, If you REALLY want to be antique with this thing, and solve your hex nixie problem at the same time, then use OCTAL. A 4-bit number requires two octal digits (0-7), but an 8-bit number only requires 3. No, it isn't hex, so all of that accumulated instant translation in our brains isn't available, but you can learn octal, too. -- The Backwoods Engineer

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/30/2011 2:51:52 AM
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I have seen all of the hex characters displayed on a seven segment display, it was in an IC manual, I don't recall which one. But I have not seen Nixie tubes or others showing the formed letters, or even just the additional characters A-F. The practical reason is the number of pins at the tube input would get out of hand, and be uneconomical to produce. So your very best luck would be some VF seven segment display.

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/26/2011 5:57:58 PM
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They used to have these on gas pump displays. I know a man has a working counter-timer with maybe 8 nixie tubes he doesn't want. Probably hardwired to decade decoder drivers. Also probably worth more in one piece. He got it on Ebay cheap so its not all that collectable.

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/25/2011 7:45:30 AM
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OK – so not hexadecimal per se, but they did make 15-segment display Nixie Tubes that could display all the hex characters... It's funny -- when LED displays first came out I thought they looked so cool compared to the older displays ... now I think the older displays look amazing (even though I know they are unwieldy, consume huge amounts of power, and have a relatively short lifespan...)

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/24/2011 11:12:56 PM
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Here is a link to a data sheet for Burrougs B-5971, B-8971 and B-7971 Alphanumeric Nixie tube displays. www.tubeclockdb.com/data%20sheets/B8971.pdf

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/24/2011 9:39:20 AM
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Hi David -- thanks for the offer, but I think we'll stick with the Numitrons for the moment -- I cannot wait to see them lit up :-)

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/23/2011 10:13:20 PM
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Just had a look at your link Max...the numitrons there are not at all like the ones I had, mine looked more like standard 7-seg displays (ie rectangular). Maybe I got the name wrong. The cold cathode 7-segs I have display appearance very similar to the ones in your link, ie luminous orange.

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re: Wanted: Hexadecimal Nixie Tubes or similar display devices
10/23/2011 10:04:17 PM
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"There were discharge 7 segment displays, but these are long since EOL..." As it happens I have some of these in my junk box. Dual 7-seg cold cathode displays, same principle as Nixies but they are 7-segment. You'd probably need to use a decoder and then discrete transistors driving the segments. I've got at least 4 x dual 7-seg digit displays, if you're interested Max I'll send you a photo, you'd be very welcome to them. Numitrons are easier though as you can use standard 74 ICs to drive them.

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