Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old January 29th 08, 05:11 PM posted to sci.electronics.repair
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On Tue, 29 Jan 2008 13:46:44 GMT, "Arfa Daily"
wrote:



If it was a true neon bulb, then it wouldn't actually need to be connected
into any circuitry in order to light up as an indicator of flyback activity.
Most gas filled tubes will light in mid air if they are in close enough
proximity to a flyback tranny. Back when I was an apprentice, like 35 years
ago, the guy that I worked under in a TV workshop, used to keep a short thin
flourescent tube on his bench. He used this to test for horizontal output
stage activity, simply by waving it around the FB tranny. As I recall, he
used to reckon that he could tell a lot about how that stage was working,
when he had a lack of picture fault, just by the 'way' in which his little
tube lit up.


Years ago, we'd just tape or glue a neon bulb on either a dowel or a
pencil. Then someone realized that pencil lead conducts and the dowel
method became much more popular!

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Old January 29th 08, 07:46 PM posted to sci.electronics.repair
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Assuming the HV supply is still good, you should have it rebuilt. Neon
signmakers are plentiful, generally do good worrk, and can duplicate any
tube you bring them.

Just a thought.



Even if it weren't, used neon transformers are cheap.

I haven't heard anything but incoherent rantings from that guy though, I
dunno what he's doing on this group. Nothing he posts makes any sense, or
has anything to do with electronics repair.


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Old January 29th 08, 08:47 PM posted to sci.electronics.repair
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wrote in message ...

Which reminds me. I have an old neon bulb nightlight. This thing
is confused and retarded. If the room is dark, it does not light. But
when I flip on the ceiling lights in the room, or point a flashlight
at it, the neon lights up...
I think it's just plain old, but I leave it there just because it's a
conversation piece.


Believe it or not, this is more or less normal for an old neon bulb.

Ambient light knocks electrons off the neon atoms in the bulb, _lowering_
the threshold voltage. This bulb has aged to the point where the line
voltage isn't high enough to light it _until_ room light or a flashlight
"kicks butt" on them-there outer-orbital 'lectrons.


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Old January 29th 08, 09:40 PM posted to sci.electronics.repair
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My old NO VACANCY neon sign is an old metal box, the old brown paint on
the box is very faded.The neon glass tubes, some parts of the glass
tubes are completly broken away, missing.The box still has the old high
voltage power thingy in it.I don't think there is anybody in my local
city area who builds/repairs old neon signs.I only hang onto it because
it is very old and I like to collect all kinds of very old things.The
Postman Always Rings Twice old movie.That poor cat got zapped on that
neon sign.
cuhulin



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Old January 29th 08, 10:12 PM posted to sci.electronics.repair
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[email protected] invalid.com wrote:
I have an old neon bulb nightlight. This thing is confused and retarded.
If the room is dark, it does not light.
But when I flip on the ceiling lights in the room,
or point a flashlight at it, the neon lights up...
I think it's just plain old,

William Sommerwerck wrote
WITHOUT ATTRIBUTION TO THE PREVIOUS POSTER:
Believe it or not, this is more or less normal for an old neon bulb.

Yup.
In the '60s, electronic organs used neons in their percussion circuits
(e.g. a Xylophone tab).
Incandescents were positioned inside the unit near the neons
so that NE-2s were "biased".
When someone said his precussion stopped working,
you made sure your stock of mini incandescents was up to snuff.
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Old January 29th 08, 10:24 PM posted to sci.electronics.repair
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Arfa Daily wrote:
Back when I was an apprentice, like 35 years ago,
the guy that I worked under in a TV workshop,
used to keep a short thin flourescent tube on his bench.
He used this to test for horizontal output stage activity,
simply by waving it around the FB tranny[...]

Old tricks are so cool.

Most of the similar 'bulbs' that I've seen on CRT base connector boards,
have been gas-filled spark gaps. I seem to recall that they used to put
argon in them, and when they went off as a result of an inter-electrode
short in the tube, they lit up white, rather than the orange glow of a neon.

Well, Argon would be the cheapest
--but the Argon stuff I've seen glows purple.
Maybe those are a different gas--or a gas mixture.
http://www.google.com/search?q=cache...righter.orange
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Old January 30th 08, 02:09 AM posted to sci.electronics.repair
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"James Sweet" wrote in message
news:%[email protected]

"Tim" wrote in message
...
In article ,
says...
My old NO VACANCY neon sign is an old metal box, the old brown paint on
the box is very faded.The neon glass tubes, some parts of the glass
tubes are completly broken away, missing.The box still has the old high
voltage power thingy in it.I don't think there is anybody in my local
city area who builds/repairs old neon signs.I only hang onto it because
it is very old and I like to collect all kinds of very old things.The
Postman Always Rings Twice old movie.That poor cat got zapped on that
neon sign.
cuhulin


You could always use those Cold Cathode light ropes they sell for
computer case modding. They could bring the neon look back to life, with
no HV problems to deal with.

- Tim -


Or just send the glass out to have it fixed properly. I dunno how it's
possible to live to far from a neon shop, there's lots of mom & pop joints
still spread around the country. The craft nearly died out for a while,
but in the last couple decades there's been somewhat of a revival. Once
have the sign box with the transformer, it's not terribly expensive to
have new units made for a simple sign like that.

There's LED "neon" out these days, but nothing comes close to the real
thing, it just doesn't look right.


Yup ! 'Neon' tubework has a look all of its own. When I first went to Vegas
probably 20 odd years ago, it was all neon. Now, with a few exceptions like
the main signage at Flamingo, and one or two machine banks on the casino
floor, the Strip is now predominantly lit by LEDs and LED giant screen TVs.
There's still some original-style neon tubework downtown at the Golden
Nugget and so on, but not a lot any more. The neon had a much more 'organic'
feel about it, I think. Kinda like the difference between film and video.
Still very pretty there, and unlike anywhere else on earth, but not quite as
'warm' feeling as in the old days ...

Arfa




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