Anybody have any ITS1A for sale?

[Jonathan Peakall]

As the title suggests, I'd love to buy some of those tubes. Dang john for linking to those tubes, they were just so cool I want some!

 

Jonathan
www.madlabs.info

[Nick]

On Thursday, 29 November 2012 16:10:03 UTC, Jonathan wrote:

As the title suggests, I'd love to buy some of those tubes. Dang john for linking to those tubes, they were just so cool I want some!

They seem pretty rare - I only have a couple but have not yet powered them up... 

[Bryan Goines]

Yeah, I would love to buy some. I searched for them on ebay or google and can't find them. ITS1A tubes look like IV-22 tubes

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Bryan Goines

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[Joseph Bento]

That's the thyratron based 7-segment display?  I have a set I purchased years ago from a US seller, and am still researching a suitable driver to build a clock.

 

I don't understand the practicality of such a display, or why the Russians developed this.  Nixie and numitrons were already very mature at the time these were made.

 

Joe

[Dekatron42]

Thyratrons are quite smart in that way that when you have triggered them they stay on until you remove the power or pulse them to extinguish them. This means that any driver logic just has to drive them the instant that you want to display something, after that the driving logic can hibernate or even switch off, the display will still show the last information until switched off. The Thyratron design can probably be made more robust than Nixies and Numitrons and might also consume less power which makes them interresting in a lot of applications.

 

/Martin

[Jonathan Peakall]

Joe,

I thought that once you met the oddball voltage requirements that these were easily driven with TTL logic levels? So your uC or whatever is the driver?

Wanna sell the ones you have? :-0

Jonathan

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[Joseph Bento]

Jonathan,

 

I'm going to hold off a bit on selling them.   The more I look at the clock on the decadecounter web site, the closer it resembles the single digit Nixie or VFD clocks I've built in the past.  I'm going to try that basic circuit, and see what I can do with a 555-based switchmode supply.  It would seem I might be able to reverse the diode as part of the -300 supply.

 

Joe, N6DGY

[Michel]

Reversing the diode would be a bad idea as the current will have
nowhere to go once the HV switch opens. What you could do is take an
ordinary AC transformer (say 240V primary 12V secondary), go from AC
to DC using a rectifier bridge and capacitor, then feed your 555-based
HV circuit out of this DC voltage. Then connect the +300V to the GND
of your circuit and you have a -300V where normally the GND would be.
Just be sure not to power anything else out of this secondary winding.

Michel

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[Joseph Bento]

Yes, I realized my error shortly after I posted my reply.  I'd like to see the schematic that decadecounter is using, as I assume the power supply is integrated on his PCB.

 

Joe