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 Post subject: Name that Tube
PostPosted: Nov Thu 28, 2019 12:55 am 
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On tonight's episode we have a nice looking tube with an interesting internal structure, it has an octal base and no writing on it anywhere

So can you Name that Tube?


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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 1:59 am 
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That is a Dekatron.

A decade counting tube.

https://en.wikipedia.org/wiki/Dekatron

-Steve

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 2:09 am 
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30 anodes! For what purpose?

Norman

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 2:37 am 
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Braithwaite wrote:
30 anodes! For what purpose?Norman


...more's better ? :-D

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 3:46 am 
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Braithwaite wrote:
30 anodes! For what purpose?

Norman

No, 30 cathodes; the anode is the disc in the middle. By applying pulses to the cathodes in the right sequence, the glow (the tube is gas filled) is transferred from one to the next. That's how it counts. The cathode that has the glow is also a readout of the count.

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 4:00 am 
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I stand corrected. 10 is used for decade counters, 12 or 24 is used for hour counters but 30?

Norman

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 4:22 am 
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10 glow anodes - the others are guide electrodes that are pulsed to move the glow clockwise or counter clockwise.

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 Post subject: Re: Name that Tube
PostPosted: Nov Thu 28, 2019 12:35 pm 
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Interesting, thank you for the info. here is a 30 in operation:

https://www.bing.com/videos/search?q=de ... ORM=VRDGAR

and an explanation of how they work:

https://threeneurons.wordpress.com/dekatron-stuff/


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 Post subject: Re: Name that Tube
PostPosted: Nov Sat 30, 2019 6:04 am 
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cl350rr wrote:
...

and an explanation of how they work:

https://threeneurons.wordpress.com/dekatron-stuff/


Thank you, for referencing my page:

That particular tube, in the original photo, is almost certainly an Ericsson GC10/B, as it looks like only 5 wires are only being brought out to the tube stem:

https://frank.pocnet.net/sheets/022/g/GC10B.pdf

Yes, its was once part of the same Ericsson that makes cell phones. Except it was the British branch, which split off from the Scandinavian mother company just prior to WWII. The term "dekatron" was trademarked by British Ericsson, in the 50s. British Ericsson eventually was merged into Plessey, which in turn, was aquired by Siemens.

Like "thermos" & "xerox", dekatron is often used for competitors versions of this "glow transfer counting tube". Here's a page full of different versions made across the planet:

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

A couple more short videos, of the tube in action:
https://www.youtube.com/watch?v=15II0yrt3kI
https://www.youtube.com/watch?v=Bh_Cn4NE64Q

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