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Nixie Tube Clock Kit Assembly

Aldehyde

New Member
Hey everyone,

I recently assembled a Nixie tube clock kit and figured the AK crew would be interested to see the photos. I put it in the tube forum because I figured that if you like tube audio gear, you'll like Nixie tubes.

This is the inspiration. These are around $450 i believe.
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Obviously, being a cheap bastard I wasn't going to spend near 500 bones on a clock, so found a kit for significantly less. I ordered it from tubehobby.com in Lithuania. It is an excellent kit and I highly recommend it.

Nixie tubes are glass tubes with numbers that light up when an electrical current is applied. They are filled with neon gas and give off a hypnotizing orange glow. They were used in the 50s and 60s before LED number displays (the red digital displays) came out. Mostly used for laboratory equipment, voltmeters, stuff like that.

For whatever reason, the USSR was huge into Nixies and produced billions of the things. There are huge stocks of surplus Nixie tubes that people have bought to use in projects, like clocks. The tubes for our clock kits are IN-14 tubes (different from those pictured in the clock above), and were made in 1981 I think.

Here is a broken nixie tube:
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And here are the components that come in the kit: 2 PCBs and a few ICs, resistors, caps, etc.
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As you'll notice, there is no case for the clock. I'll be making mine out of wood and aluminum so it will be similar to the clock above.

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I have never really done an electronics kit like this before, so I reviewed online tutorials about soldering and electronic components basics (how they should be positioned, polarity, etc). Once comfortable I laid every thing out in an organized manner and set about figuring out what was what.
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The components are sorta marked. Resistors have color coded bands that tell you the resistance, capacitors have the # labeled on them. Transistors have a code. The instructions are pretty good so I was able to figure it out in an hour or 2.

The PCB (printed circuit board) has the orientation of the components laid out well, so that takes most of the guess work out.

You just put each component in, solder the back, and clip the excess leads.

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It is actually a lot of fun. You have to be very organized and super precise. The parts are all really small and have interesting shapes and colors. Good times.

This is a video of the same kit that I have. Mine looks the same but I didn't put in the flashing dots that separate the numbers.

http://www.youtube.com/watch?v=f4-JC8UzxTI
 
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After some more soldering I got all the components soldered onto the PCB.

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It's like a little city that you build up from small little houses to large skyscrapers and big ol' warehouses. The PCB connections look like roads.

Here is the underside with all the solder connections. They look OK for my first PCB assembly. Not professional or anything, but pretty good. They will do the job.

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Since the kit comes from Lithuania they don't supply a power source. I went to an electronics surplus store to pick up a 10V / 500mA DC source. The first one i got was actually AC, not DC (it was incorrectly marked and in the DC bin). Luckily the fuse did its job and popped. With a correct DC power source I was able to set the voltage using this blue adjustable resistor:

DSC_0067.jpg


The voltage is set to 160V for the tubes I have. Which is quite a bit. Don't touch it.

Next up is to solder the Nixies to the 2nd PCB board. You slide the little plastic holder down the wires to line them up.
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Solder each one and then clip off the extra leads.
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You can see the Nixie construction pretty well here:
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With all of the tubes in it is time to fire it up and test it out.

Hold breath, turn on power, and see this:

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SUCCESS! These tubes are from the end of Nixie manufacturing and have a bit of Mercury added to extend the tube life. I've read they can last up to 200,000 hours. The mercury gives a bit of a blue/purple glow around the orange discharge. I think it is really beautiful. The orange glow is a bit diffused and soft. It's cool.

There are 2 buttons on the back that are used for setting the time, date, etc. There are actually a ton of settings - how the numbers fade, 12 or 24 hr clock, date configuration, etc. You can also hook it up to run off the atomic clock if you have a GPS receiver, but they are like $150 I think. I set it to official US time last night (http://www.time.gov/timezone.cgi?Pacific/d/-8/java) and it is about a quarter second slow after a day.

The coolest feature of this kit is that you can set it to automatically turn off and on at set points. So I set it to turn on at 5pm and off at 10pm. This prolongs the Nixie life by a significant amount. There is also a tube life counter that keeps track of the hours the tubes have been on. Importantly, you can easily override the auto off/on function to turn the clock on, like during weekends or late night parties.

Next up is construction of a wood / aluminum case similar to what is pictured in the top photo. Do you have suggestions for what kind of wood I should use? The upper piece will be 1/4" thick rough milled aluminum.

DSC_0087.jpg
 
Very cool - I've wanted to build a Nixie clock for a while now, but the price tags keep scaring me away.
 
I really like your project and from the pictures, you may not have had any experience with electronics before, but your methods are excellent. You must have some kind of technical background or are project oriented.

The project has me thinking about Christmas presents for the family this year. Can you post links to the website for the kit?

EDIT: Doh! Just saw the link. I was bedazzled by the pretty lights!
 
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Nice kit and a decent price, I have been building various tube amps for the last two years this will be a nice change.
 
I've got the same kit, it's been on constantly for about 1 year now, no problems what so ever. Did you see you can use larger tubes? All you need to change is a few resistors and get a new pc board for the top. Looks great!
 
I have wanted to do this as well. Now thanks to you, I will have to. Darn cool! How does it indicate how long it has been on? John
 
This kit with the IN-14 tubes was $99 + about ~ $15-20 shipping. I was a bit concerned about ordering from the EU, but it was an easy transaction and took less than 2 weeks to receive.

There were kits for IN-18 tubes, which are around twice the size. Tubehobby.com dosn't have these kits anymore because the IN-18 tubes have become very difficult to find. Plus they run around $30 / tube. Apparently only 3 years ago they were readily available and much more reasonably priced.

To indicate the tube life you press and hold one of the SW buttons on the back. This will bring up a series of numbers, which indicates the hours the tubes have been on.

Bob - your on the opposite path that I took. I wanted to start with something a bit cheaper and simpler than a tube amp to cut my teeth on tube assembly. Now that this worked out OK i'm going to start looking around for a nice tube amp kit. It is kind of an addiction isn't it?

Gearhead - you must mean Dec '08 / Jan '09. Is it a Tubehobby kit with IN-14 tubes? I think they are fairly sensitive to input voltage, you check it across C6 (if you have the same kit) and turn the variable resistor to set it at 160V. I read in the manual that having the time cycle to the date and back once per minute prevents cathode poisoning. Apparently if you have a tube lit for one number for a long period of time it will decrease the life of the tube. I'm sure google has more info, but I'm sorry to hear about your troubles.
 
There are old Heathkit counters that use nixie tubes as a display. I'd love to find one, but I'd use it. My early 80s vintage counter is old style boxy LEDs. A nixie display would be much nicer to go with my 1950s vintage signal generator.
 
There are early "digital" FM tuners from several mfgrs. with Nixie frequency displays.
Most if not all of said tuners are analog devices with frequency counters and displays, not digital in the sense of the front end circuitry.
 
Nixie tubes

When I first went into the Nuclear Power Industry, practically all our digital display test equipment used nixie tubes. I always liked the way they looked.

In 1976, Heathkit offered a digital clock for automotive use that used a display that had the orange glow of a nixie tube without the bulk. This technology is called Panaplex gas discharge and several early digital displays used this technology prior to the widespread use of LED technology.

I built one of these kits and had it in my vehicle until such time as they came out with a later version that used LED technology with a blue display. At that point I upgraded to the newer unit. I still have the original unit, as well as the later unit!

http://www.decodesystems.com/heathkit-gc1093.html
 
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Gearhead - you must mean Dec '08 / Jan '09. Is it a Tubehobby kit with IN-14 tubes? I think they are fairly sensitive to input voltage, you check it across C6 (if you have the same kit) and turn the variable resistor to set it at 160V. I read in the manual that having the time cycle to the date and back once per minute prevents cathode poisoning. Apparently if you have a tube lit for one number for a long period of time it will decrease the life of the tube. I'm sure google has more info, but I'm sorry to hear about your troubles.

I meant Dec '07/Jan '08.
I'm not sure what tubes it uses.
 
This kit with the IN-14 tubes was $99 + about ~ $15-20 shipping. I was a bit concerned about ordering from the EU, but it was an easy transaction and took less than 2 weeks to receive.

There were kits for IN-18 tubes, which are around twice the size. Tubehobby.com dosn't have these kits anymore because the IN-18 tubes have become very difficult to find. Plus they run around $30 / tube. Apparently only 3 years ago they were readily available and much more reasonably priced.

Very nice clock you built. I built a bunch of them a few years ago. Here is one of them using 40mm high IN-18 tubes... I have a stash of about 30 IN-18 nixie tubes.... not to mention 100's of others.

http://www.tuberadios.com/nixie/in18.html

in18e.jpg


Sal
 
I want one but don't have the skills to do it! Anyone looking for a trade?:scratch2: I do have a few pieces of audio equipment, tubes and a variety ofnthings around!
 
Finally finished this clock by making a case for it.

It is a Bacote top with Alder bottom. The bottom is a solid piece - I drilled it out with forstner bits and then used a chisel to square it. The top piece is held on with permacel (double sticky tape).

I think it turned out well. The little balls in the back are to push the buttons to set the time / options.

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