Re: [neonixie-l] Re: Homebrew high voltage nixie power supply

[Kevin A.]

I have some boards in stock for the initial orders which I am assembling;
I'll see if there are any left at the end of this batch (20 total; 5 of
which are already accounted for, with more requests on tindie).

On Thu, Oct 17, 2019, 2:15 PM 'Dave' via neonixie-l <
neonixie-l@googlegroups.com> wrote:

>
> Are you sharing your board designs as open source?
> Or will you sell bare PCBs??
>
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> .
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Re: [neonixie-l] SCM Marchant 414 schematic diagrams anyone?

[Dekatron42]

Yes of course I will share what happens.

I am right now reverse engineering the power supply but since I don't know 
what the original transistors where, they've all been replaced with modern 
components, and I am not even sure the replacements are the correct types I 
don't know where I will end up. I'll do my best with the schematic and if I 
can't understand the design I might build another power supply to power the 
calculator with to see if it works. The necessary voltages are +100V, 
+197V, +200V, +20V, -35V, -18V and -15V and the total power is only 15W.

/Martin

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[neonixie-l] Re: Homebrew high voltage nixie power supply

['Dave' via neonixie-l]

Are you sharing your board designs as open source?
Or will you sell bare PCBs??

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Re: [neonixie-l] SCM Marchant 414 schematic diagrams anyone?

[Paolo Cravero]

Hello Martin.
No, I don't have the diagram. I have seen that calculator for sale and I
was tempted to get it ... almost just to try to fix the power supply! At
least I think it is the same machine. Would you share your findings,
if/when you get it back in working state?

I have a Casio CL-200 with individual Nixie tubes. it accepts digits
endlessly but does not calculate. It has a good amount of discrete
components with obscure part # and reverse engineering from the board is
no-go (too long). No way to find a schematic diagram which, at the time,
was probably highly secret. It might still be somewhere in Casio archives,
though.

Good luck with your SCM 414.

Paolo


On Wed, Oct 16, 2019 at 6:57 PM Dekatron42 
wrote:

> Hi,
>
> I just bought an old SCM Marchant 414 with a 14 digit ZM1200 Pandicon as
> the display element!
>
> The Pandicon contains Neon and looks just fine however the previous owner
> had disconnected the power supply from the main board and the power supply
> has been repaired extensively.
>
> All of the transistors and one UJT 2N2646 and one SCR TIC125M, there are
> five MJE340 and a bunch of small TO92 transistors that have also been
> replaced.
>
> Before I switch on the power supply I wonder if anyone here has a
> schematic diagram of the calculator, especially the power supply? A quick
> Googling didn't turn up any circuit diagrams and just a handful of websites
> with information but none with the Pandicon, all had separate Nixies
> instead.
>
> The voltages from the power supply are printed on the circuit board but
> since the power supply directly rectifies the mains voltage I'd really like
> to know how it works before just turning it on.
>
> /Martin
>
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> 
> .
>

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[neonixie-l] Dancing Cowboy Nixie

[Michail Wilson]

I am sure most, if not all of you, know the youtuber: glasslinger
If not, here is your chance.  Typically he does radio restoration, but makes 
many of his own tubes.

Here is a new video of him (Ron).  Great knowledge to be had with this guy.  I 
love his videos.  You may wish to subscribe to his channel.

https://www.youtube.com/watch?v=9r5NCVR_zYU

Michail 


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[neonixie-l] Re: Heads Up: IN-12 Sale on eBay (20% off)

[Robert G. Schaffrath]

I know and I have also come to realize the prices now will look like 
bargains in 10 years since they are not making any more. I still recall 
when B-7971's were quite common and could be had for, adjusted for 
inflation, about USD$15/each and they were plentiful (paid USD$5/each in 
1979/1980 for the 6 NOS B-7971's I have). Then the 25 NOS ZM1022's for 
USD$4.81/each including sockets back in 2002. I plan to use 4 for the 
IN-12's with one of the cheap Chinese clock kits (some assembly required 
LOL). If I like it I might make some additional one for interested friends.

The sad fact is that except for Dalibor Farby, they are not making Nixie's 
any longer and when the supply dries up, that is it. At least the quality 
of the Russian tubes is good. The Chinese ones will probably be around for 
a while longer but with tubes like the QS30's lacking mercury, they wear 
out pretty fast according to reports. I suspect many will probably get used 
up as replacements for prematurely burned out tubes. I am amazed that the 
ZM1022's are rated 200,000 hours and QS30's can wear out in weeks.

On Wednesday, October 16, 2019 at 11:32:53 PM UTC-4, GastonP wrote:
>
> It's really crazy to think that about 10 years ago I could buy a box of 50 
> IN-12B for 48 USD or so... "free" shipping and all.
> Well, the crazy part is that at that time IN-18s were already expensive, 
> 7971s were as always, unobtanium and IN-12s were the nearest thing to dirt 
> cheap. Prices for the IN-14 were starting to rise steeply.
> At that time I bought several IN-8s and sockets at a barely reasonable 
> price and the mentioned box of IN-12Bs. I should have bought IN-18s too 
> when I still could and they were just expensive at USD 15-20 a pop... 
> sigh...
>
> On Wednesday, October 16, 2019 at 2:47:12 PM UTC-3, Robert G. Schaffrath 
> wrote:
>>
>> I just picked up a lot of 12 (2 x 6) NOS IN-12 Nixie's on eBay that are 
>> temporarily price reduced 20% to USD$8.80. Total came to USD$30.00 + my 
>> local tax. I am really not crazy about the inverted "2" but as they are not 
>> making these any more, having some on hand for possible future use seemed 
>> like a good idea. I dug back in my records and found out I paid a little 
>> less than USD$5/each back in June 2002 for my 25 NOS ZM1022's with included 
>> sockets. Looking at the prices of those tubes now it looked like a good buy 
>> so I figure these IN-12's are probably worth getting too.
>>
>

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[neonixie-l] Yahoo groups terminates December 14th...

[Nick]

On December the 14th, all Yahoo! group content will be removed.

https://help.yahoo.com/kb/groups/SLN31010.html?impressions=true

Please note we have all the files from the old group in our Drive section here 
and the message base is archived on groups.io (and multiple people have copies.

No data will be lost.

Nick

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