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Nixie tube making blog

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Facebook page established

I decided to establish a Facebook page for nixie making project. I plan to add there some random photos, snapshots and so.. I called it “DaliborFarny.com”, on that domain will be a static content and some products for sale I hope 😉

You are welcome here: Facebook page

Another nixie tubes made

As I promised, I started making a sample tubes. I am now working on a project for one local contest, more later.. And I made two new tubes as a prototypes for that project.

All three tubes, from oldest to newest. Read more

Big progress: Lab Sample No.3

I experienced big success today. I sealed first really working nixie tube (or nixie retort ;-). I surprisingly didn’t forget to do any individual step in the making process and ended up with a tube that by far exceeded my expectations.

I tested the tube carefully on the helium leak detector several times, I also checked all the vacuum system, gass filling manifold and gas connectors. I found one small leak on the teflon washer on one of the needle valves (for neon filling) – repaired – and one on the connector to neon bottle – placed a new o-ring. I pumped down all the vacuum system for several hours, gass filling manifold included. I then rinsed both gas branches with gases to get rid of remaining air, closed both needle valves and made a overpressure in those branches so that no air would get in. It turned up that this step was critical for gas purity.

The tube was baked out to 410C (then it broke down, should go to 480C) and then it was filled with neon and argon (5×10-2 torr of argon accorging to thermocouple – very inaccurate value).

Number “0” is not working as the wire sticking out of the tube broke off 🙁 Also the stainless steel assembly inside is attacked by something that made it “rust” 🙁 I don’t know what.. The tube has so strange shape because I didnt have a tubing of so large diameter, so I had to blow it from smaller one..

The most important thing is that I achieved values of striking voltage that are almost like industry made tubes! That is the most important thing for me!

Striking voltage:

1 – 139V

2 – 136V

3 – 141V

4 – 140V

5 – 131V

6 – 149V

7 – 126V

8 – 124V

9 – 136V

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Garden shed finished

Finally, the shed is finished and I can start moving all the equipment that I gathered in recent two years there. Building of the shed was the major job during last 5 months, I didnt have much time for real nixie tube research, but that changes! I made the glassblowing stuff working today – torches, propane-butan bottle, oxy concentrators, manifold and so.. I also moved some of the stuff here, it is waiting to be sorted out..

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Metal parts for nixie tubes

I got a sample of etched parts today, the quality is absolutely outstanding! Sharp edges, no etched spots, no under-etched places. I cant wait to put it all together! Sorry for quality of the photos, all were made in a hurry, as usual 😉

Hexagonal anode grid

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Assembly test No.2

I made some minor changes is the last nixie tube design and decided to get it etched from brass. It would be better to have it made from stainless steel, but the company I use for etching experience some problems with photo resist, so I decided to use a brass, only for this test. Brass is nice material, it is unfortunately impossible to use it in vacuum tubes. It relieves a zinc into vacuum during a bake out phase, the zinc then condensates on the colder glass envelope.. It is also too soft and numbers made from brass would sputter heavily.

This assembly should be fully working, the numbers are insulated by ceramic beads and the wire inside them is insulated by thin glass tube. There are no shorts. I plan to put it into vacuum chamber to test its behaviour, glow evenness, brightness, breakdown voltage and so..

The mica sheets were cut by scissors, I plan to make a circular cutting knife and use a press to produce nice and even circle..

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Heathaway glas lathe in the shop!

New addition to the workshop, Heathway glassblowing lathe. I got it on eBay and it took almost a month to arrange a trasport from UK here to Czech republic. But it finally came off and it is now sitting firmly on the concrete block for my future garden lab (masked as garden shed) 😀 This lathe was manufactured in 1968 in UK and served all its life in a university glassblowing lab. That lab was cancelled around 2012 and the equipment was sold out.

I am currently spending all my time building the shed so that I can accomodate all the stuff here. Once it is finished I will feed You with glowing wires continuously 😉

I plan to use that lathe for doing all the glasswork for nixie tubes..

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First nixie digits assembly

Hi all, the frequency of posting updates decreased significantly, but don’t be afraid, I am still working hard to produce real nixie tubes. I am building a garden shed now, I collected so many crazy stuff that I need more room again. I will post some photos of the garden shed later 😉

I am developing a layout for etching all the metal parts necessary for assembling a nixie tube, such as digits, anode grid and so. My plan is to make Z568M reproductions as I consider these tubes the most beatiful ones! I found that using a 0.1 mm thick stainless steel for all the parts is quite tricky, it is too thin and especially the anode tends to twist.. I will have to find a supplier of 0.3mm stainless steel sheet and I now this will be pretty hard here in Czech Republic.

There are some photos of the test assembly.. It turned out that I used wrong line thickness for the anode grid so it was etched out 🙁 There are also some other minor problems that will be fixed in next layout. The enclosure is pretty creased because I fold it in hand, I plan to use some bending tool for real production to achieve right angles and perfectly flat areas.

I would like to thank to etching company Etchworks.cz for their patience with me!

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Oxygen concentrator

I decided to switch to oxygen concentrators from liquid oxygen in tanks. The tank is empty really fast and getting a full one is bothering, time and money consuming 😉 So I bought a slightly used Oxymat 3 from eBay, it was sold as-is and I counted with some malfunction. This one is a new model and has only 4760 hours on it, the price was 150 EUR. When I turned the oxycon on, it started to beep and signalised a problem with red LED. So I took it apart and found one plastic fitting broken, it was the fitting what is connected to the can with sieve material. This fitting has a G 1/8 thread, I found one brass fitting with that thread in my stock, so I mounted it into the can sealing it with a teflon tape. The pressure in the can is around 2 bar (30 PSI), not much.. So the  seal by teflon tape is OK here. I insert a 6mm OD copper tubing in the place of the original fitting and connected it to the brass fitting with PVC hose.

Two sieve cans, the right one has a broken outlet.. Read more

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