Five Noble Gas Tubes
- Need five of the longer ones of different gases for 120 dollars plus shipping as per your last correspondence. Reply concerning payment method. I think I also I may be interested in larger diameter bulbs, where I am wondering how much current can be passed through bulbs of this diameter, where I later may be interested in larger diameter xenon bulbs, although they may be costly. I have forwarded this correspondence to my 500+ yahoo group membership as useful bulb information. Can you say if the krypton bulb has a unique color of discharge?
Tesla Research Group; Pioneering the Applications of Interphasal Resonances http://groups.yahoo.com/group/teslafy/
--- On Mon, 8/4/08, Neonglow3@... <Neonglow3@...> wrote:
> From: Neonglow3@... <Neonglow3@...>
> Subject: Re: Need Short neon bulbs
> To: harvich@...
> Date: Monday, August 4, 2008, 8:29 PM
> Hi Harvey,
> If you are pushing high currents through the neon tubes, a
> larger diameter
> might be advantageous to you. One-half inch diameter is
> between 12-13mm, but a
> 15mm tube would not get quite as hot. It would also have a
> slightly lower
> voltage drop and longer life. I'd suggest using 15mm
> tubing with 15mm/60mA
> If the color of the neon discharge changed while in use, it
> was probably
> from the overheated glass outgassing sodium, CO2 or H2O
> vapor and spoiling the
> purity of the neon. (Have you tried forced air cooling to
> keep the tubes from
> overheating?) It is not common practice to use mercury with
> neon, but it does
> make a temperature sensitive tube that shifts from red to
> blue as it heats
> I can fill your tubes with any of the first 5 noble gasses,
> He, Ne, Ar, Kr,
> and Xe, to whatever pressure you desire. Normal filling
> pressure is about 10
> Torr, but the life of these short tubes will be less than
> that of longer
> ones. A complete set of tubes containing all five noble
> gasses costs $120, plus
> shipping, while 5 neon filled tubes would be $100, plus
> shipping, usually less
> than $10. I could probably make the tubes and have them in
> the mail to you
> within a week of receiving your money order.
> Some other things that you might find useful are as
> * Larger diameter tubes run cooler and require less voltage
> than smaller
> ones, but have less light output.
> * Short tubes usually have a shorter life due to the
> smaller quantity of gas
> * Increasing the fill pressure increases the life, raises
> the starting and
> operating voltage, and increases the operating temperature.
> * Tubes with less pressure run cooler and have a lower
> starting and
> operating voltage, but do not last as long.
> * Helium has the highest resistance and produces the most
> heat, while xenon
> has the lowest.
> * There is usually an optimum diameter, length and fill
> pressure for each
> specific purpose.
> I hope this info is helpful in determining the best
> parameters for your
> Best of Luck,
> Tony Greer
> Special Effects Neon
> 502 Avenue G
> Lubbock, Texas 79401
> In a message dated 8/4/2008 10:41:10 A.M. Central Daylight
> harvich@... writes:
> I would like five of these at the mentioned length of a
> four inch discharge
> between electrodes. Looking at my existing bulbs they
> appear to be about 1/2
> inch diameter; this would be fine. I need the bulbs to be
> ready for use from
> a NST; therefore they need to be (cooked) and filled with
> the proper
> pressure of neon gas. I would also like some other bulbs
> of the same dimensions
> filled with other noble gases, such as argon, helium and
> xenon; if this is
> practical. The shorter length of these bulbs means after
> bulb ignition the
> voltage across the bulbs is relatively low, about 250 volts
> compared to some 550
> volts for the ordinary longer length bulbs. I do not know
> if a wider diameter
> would influence this factor, as a half an inch seems to be
> a standard width.
> If you can give an idea of costs I can forward you a money
> order, as I need
> these as soon as possible. In some experiments where the
> current through the
> bulbs may have been excessive, the neon orange
> glow changed to a white one, and the bulbs seemed to be
> getting very hot.
> This is probably damaging to the bulbs, and so I was
> wondering whether it is a
> practice to coat the bulb's electrodes with mercury,
> and would this cause the
> discharge to assume a white color with excessive currents?
> Sincerely Harvey D Norris
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