Beautiful dekatron image

[Paul Andrews]

There is a listing on ebay for A-101 dekatrons that includes a beautiful image https://i.ebayimg.com/images/g/6sEAAOSwYIJeBxfk/s-l1600.jpg It looks like this originated on a Russian forum? https://forum.cxem.net/index.php?/topic/177409-%D0%B2-%D0%BE%D1%87%D0%B5%D1%80%D0%B5%D0%B4%D0%BD%D0%BE%D0%B9-%D1%80%D0%B0%D0%B7-%D0%B8%D0%B7-%D0%B3%D0%BE%D0%B2%D0%BD%D0%B0-%D0%B8-%D0%BF%D0%B0%D0%BB%D0%BE%D0%BA-%D0%BF%D0%BE%D0%BB%D1%83%D1%87%D0%B8%D0%BB%D0%BE%D1%81%D1%8C-%D1%87%D1%82%D0%BE-%D1%82%D0%BE-%D1%81%D0%BE%D0%B1%D1%80%D0%B0%D1%82%D1%8C/

[gregebert]

I'm glad to see someone actually built one; I've had a 6x6 (yep, 36 dekatrons) on my back burner for a few years now.

My base is 3D-printed; each "tile" is a 3x3 array of tubes, and I have 4 tiles. 

[Nicholas Stock]

An Objet d'Art?

On Mon, Jan 6, 2020 at 11:21 AM gregebert <greg...@hotmail.com> wrote:

I'm glad to see someone actually built one; I've had a 6x6 (yep, 36 dekatrons) on my back burner for a few years now.

My base is 3D-printed; each "tile" is a 3x3 array of tubes, and I have 4 tiles. 

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[gregebert]

On Monday, January 6, 2020 at 11:22:41 AM UTC-8, Pramanicin wrote:

An Objet d'Art?

Absolutely, though a 6x6 could also display crude alphanumerics. The basic idea is an FPGA to sequence each dekatron, and process commands from a main control device, such as a RasPi. Patterns would need to be designed (coded) and then sequenced, either randomly or somehow linked to background music (Beethoven's 9th would be a good starter...). I just need time to work on it..........

[Paul Andrews]

What a great idea.

[Dekatron42]

I made a 5*7 and a 6*8 prototype design like this some years back but decided not to go ahead and make more of it as it became so large and heavy even with the Dekatrons stacked side by side, I wouldn't have anywhere to hang it in my apartment. I used both A-101 and GS10C in separate designs with complete control of all cathodes so I could light up any cathode I wanted on any of the Dekatrons by being able to pulse them with a negative voltage.

My idea was to use 4 or 6 of these displays to make up a clock but also a 4/6 character display with rolling text. One other factor which made me scrap this project was the power it would draw, nearly 30mA at Anode-voltage of some 450V for each digit plus the power for the logic and cathode setting control, at least some 20-30W for each digit.

However, using the smaller A-107/8/9 Dekatrons might make a more beautiful design in my opinion, the only thing that might hamper the looks is the sideways protruding evacuation pip which makes it a little but harder to put them tightly packed side by side even if you turn them some 45 degrees and place the pip between them. I never bought enough of these small Dekatrons to be able to test it though.

/Martin

[Bill Notfaded]

Well Martin I have a box of new A-101 and og-4 so if you ever want to sell any large dekatron displays let me know! That's awesome! I thought that would be neat too since you can control an array of them with a SOC. I thought integrating some A-201 and Nixie would be neat as well.

Bill