Got any plastic model kits with "chrome" parts? Those are made by vacuum
metal deposition, essentially the same process by which the glass inside
those 7032 tubes we've been commenting on has become silvered. Put an
ohmmeter onto one of those model parts and see what kind of a reading you
get.
I will believe it when I see it.
On Tuesday, August 30, 2016 at 5:20:08 PM UTC-7, A.J. Franzman wrote:
>
> If you sputter enough metal onto any insulator, you can make it conduct.
>
> On Tuesday, August 30, 2016 at 1:28:06 PM UTC-7, j@my-deja.com wrote:
>>
>> I think this is improbable. On t
If you sputter enough metal onto any insulator, you can make it conduct.
On Tuesday, August 30, 2016 at 1:28:06 PM UTC-7, j@my-deja.com wrote:
>
> I think this is improbable. On the one tube that I dissected*, the back
> substrate is an insulating white ceramic with an insulating black cer
I would believe it was NOS if it was accompanied by a pristine box, the
lettering on the tube was all sharp and crisp, and the pins were all
straight (with no tool marks from straightening) and unscratched (or maybe
one scratch from burn-in).
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Sent: Tuesday, August 30, 2016 3:28 PM
To: neonixie-l
Subject: Re: [neonixie-l] Re: b7971 segment current
On Monday, August 29, 2016 at 9:31:39 PM UTC-7, A.J. Franzman wrote:
... They might be shorted to the back substrate and possibly even each other
via the substrate...
On Monday, August 29, 2016 at 9:31:39 PM UTC-7, A.J. Franzman wrote:
>
> ... They might be shorted to the back substrate and possibly even each
> other via the substrate...
>
I think this is improbable. On the one tube that I dissected*, the back
substrate is an insulating white ceramic with an
You got that backwards. Unused digits/segments in a nixie become "poisoned"
by stuff given off from the active segments. Trying to light those middle
vertical and diagonal segments in a tube from a well-used "Giant Nixie
Clock" from the early 1970's now, might reveal that those segments don't
l
On Saturday, August 27, 2016 at 1:38:28 PM UTC-7, rmp wrote:
>
> To the folks who are still running the "Giant Nixie Clock". From the early
> 1970's:
> ... as I recall it treated the tubes as 7-segment devices...Am I correct?
Yes. It was based on the MM5314 from National Semiconductor.
-
To the folks who are still running the "Giant Nixie Clock". From the early
1970's:
I built one of these way back when. Unfortunately, it is long gone, but as I
recall it treated the tubes as 7-segment devices, and so the 2 middle vertical
and the 4 diagonal segments will NEVER have been lit. A
I ran across similar capacitor problem when using surface mount tantalum
capacitors and MLCC capacitors, without the proper working voltage across
them they behave poorly. I had to read a lot of design notes and datasheets
to realise that they did not fit my design, MLCC capacitors has to be
re
ust 27, 2016 2:52 AM
Subject: Re: [neonixie-l] Re: b7971 segment current
On Wednesday, August 24, 2016 at 12:21:56 AM UTC-7, Jeff Walton wrote:
>During the life of the clock, there were a couple failures of the caps in
the voltage doubler
When your cap(s) failed, was it catas
On Wednesday, August 24, 2016 at 12:21:56 AM UTC-7, Jeff Walton wrote:
>
> >During the life of the clock, there were a couple failures of the caps in
> the voltage doubler
>
When your cap(s) failed, was it catastrophic ? I've only had 1
electrolytic fail in recent history, and it was a low-vo
long time.
From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On
Behalf Of gregebert
Sent: Wednesday, August 24, 2016 12:25 AM
To: neonixie-l
Subject: [neonixie-l] Re: b7971 segment current
> I built three clocks with a total of 18 tubes. So far, after 40+ ye
On Tuesday, August 23, 2016 at 10:25:09 PM UTC-7, gregebert wrote:
>
> 40 *years* ? How many hours per day are you running your tubes ?
>
Mine has been running 24x7x365.25, with brief exceptions for things like
moving to a new home, power outages due to earthquakes (California!) and
weather, etc.
> I built three clocks with a total of 18 tubes. So far, after 40+ years,
there have been zero tube failures.
40 *years* ? How many hours per day are you running your tubes ?
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I did nothing heroic. I used the cheapest transistors I could find
(PolyPaks, John Meshna, etc.) and carbon comp resistors. I used the
resistor values in the old "73 Magazine" article "Build a Giant Nixie
Clock" from the mid-1970s, and increased the HV power supply voltage until
it was "brigh
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