Re: [neonixie-l] Re: Rare Nimo Tubes

2016-10-14 Thread gregebert 
My vote is to play it safe and find or make a supply that gives you 2.5kV.

I was going to recommend a series dropping resistor, along with the 3kV 
supply, but I dont think that is a good idea. The reason is that while the 
resistor will provide a voltage drop at *nominal* current,  it wont do 
anything at low or zero current. Given NIMO tubes are expensive and rare, I 
wouldn't risk applying higher-than-spec voltages, just in case it might do 
something unexpected. For example, I've seen tin whiskers develop in laptop 
CCFL driver boards. Literally a microscopic metal hair that grows in a high 
electric field. Even at lower voltages, I've seen evidence suggesting this 
happened in my IN-1 nixies.

High voltage zener diodes (~160V) might work but be very careful about 
leakage current; you may end up with the same paranoia I have about using 
resistors mentioned above. If you do use zeners, I would use a 'bleeder' 
resistor from NIMO-anode to GND to drain zener leakage current, such as a 
few 22Meg in-series.

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Re: [neonixie-l] Re: Rare Nimo Tubes

2016-10-13 Thread Dylan Distasio 
Does anyone have experience undervolting these to 2kV?  I see on the
datasheet that this moves it significantly down the brightness curve, but
am wondering how noticeable it is in practice.

I was thinking of picking up an Emco F20 PS which while not as cheap as I'd
like seems like an easy way to get 2kV for a noob.  The next model up is
3kV and I would rather not overvolt as I'm concerned it will shorten the
tube life (not sure if that is actually true if current stays the same
though).

Thanks,
Dylan

On Aug 8, 2016 12:01 PM, "Nick"  wrote:

> Little more on these - I had a few broken ones in the bulk packing, so
> here are some internal shots showing the digit mask and one of the electron
> guns (one under each digit in the mask).
>
>
> 
>
>
> 
>
>
> Nick
>
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[neonixie-l] Re: Rare Nimo Tubes

2016-08-08 Thread Nick 
Little more on these - I had a few broken ones in the bulk packing, so here 
are some internal shots showing the digit mask and one of the electron guns 
(one under each digit in the mask).






Nick

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Re: [neonixie-l] Re: Rare Nimo Tubes

2016-08-06 Thread Dekatron42 
You can use Photo Multiplier Tube (PMT) power supplies, buying them from 
Ebay is usually cheaper than in a shop.

There was a clock called Cyclock that used the similar Telefunken XM1000 
(if I remember correctly) that you might be able to Google to find the 
details.

/Martin

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Re: [neonixie-l] Re: Rare Nimo Tubes

2016-08-06 Thread Dylan Distasio 
I took the bait and picked up 4 of these to add to my future projects
pile.  That said, I've never experimented with voltages beyond the dekatron
range.  I don't know that I'm interested at this point in building my own
kV PSU (although I would be eventually).  Can anyone recommend a relatively
inexpensive off the shelf PSU to drive these with?  According to the
datasheet, I should be looking for 2.5kV on the anode, with 1.1V on the
filament.  I'm not sure exactly how to drive the grid.  Does the grid
consist of the cathodes?  Apologies, but I have zero CRT experience at this
point, and any pointers would be appreciated.  I'd like to at least be able
to test these when they come in.

Thanks!

On Thu, Aug 4, 2016 at 10:05 AM, gregebert  wrote:

> Anyone here have a NIMO clock they built ? I'm curious about their
>  observed lifetime; datasheet says 10,000 hours which is slightly more than
> 1 year if running 24/7.
>
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[neonixie-l] Re: Rare Nimo Tubes

2016-08-04 Thread gregebert 
Anyone here have a NIMO clock they built ? I'm curious about their 
 observed lifetime; datasheet says 10,000 hours which is slightly more than 
1 year if running 24/7. 

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[neonixie-l] Re: Rare Nimo Tubes

2016-08-04 Thread Nick 
USD 100 each seems to be about the going rate.

The ones I have are in the same bulk packing...

Nick

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[neonixie-l] Re: Rare Nimo Tubes

2016-08-04 Thread Dekatron42 
A set of six just sold from the same 
seller: 
http://www.ebay.co.uk/itm/IEE-nimo-6000-31--10-Electron-Gun-Display-Tube-CRT-Nixie-LOT-OF-6-NOS-RARE-/282111471567?hash=item41af276fcf:g:5eUAAOSwIgNXlN-c

/Martin

On Thursday, 4 August 2016 12:00:34 UTC+2, Paul Parry wrote:
>
> Just spotted these on the Bay
>
> http://www.ebay.co.uk/itm/IEE-nimo-6000-31--10-Electron-Gun-Display-Tube-CRT-Nixie-Rare-/282121267238?hash=item41afbce826:g:B70AAOSwIgNXoSa
> ~
>
> Nothing to do with me, don't know seller etc.. but know they are 
> interesting and unusual tubes..
>
>
>

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