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Experimental electrodeless decorative plasma tubes and bulbs

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Carl A. Willis

Wed Feb 13 2013, 05:07AM

Registered Member #9640 Joined: Wed Jan 16 2013, 07:53AM
Location: Albuquerque, New Mexico
Posts: 26

I just posted a thread yesterday about decorative rare-gas plasma tubes: http://4hv.org/e107_plugins/forum/forum_viewtopic.php?150630

Naturally, my exploration of this hobby has created a lot of "byproduct" in the form of flasks and tubes that are superfluous to my needs. At last count, I have about twenty pretty and fully functional plasma flasks and tubes. I keep a couple examples of my work, but I cannot just let these things pile up. So naturally, they are offered for sale. I should be clear that the stuff being disposed of this way is NOT "garbage" in the sense of being second-rate to what I keep--it's simply excess decent functional pieces. I do not use premium-quality American borosilicate, since that would be a waste of money for my experimental purposes. Instead, I use Bomex ("chinex", or Chinese borosilicate labware) as the flask blanks, and I use glass tubing stock from a second-hand local Craigslist source. My skills in glassblowing are not professional-grade, but I do follow reasonable standards in maintaining wall thicknesses, in closing tubulations carefully, and in annealing my work. Flasks require kiln annealing and I use a standard programmed cycle. Tubes can typically be flame annealed with a Meker burner using a special cradle I have. Some of the flasks still have their enameled frit mark. This can sometimes be removed using dilute HF ("Whink") and a Scotch-Brite sponge, but other times it is highly resistant.

I have a couple Fleabay listings:

Xenon-filled decorative plasma flask, 500 ml (http://www.ebay.com/itm/111011957943)
Xenon-filled decorative plasma flask, 1 l (http://www.ebay.com/itm/111011958894)
Krypton-iodine-filled decorative plasma flask, 1 l (http://www.ebay.com/itm/111011959960)

EPay is not a streamlined or effective way to dispose of lots of these, but it is a way to determine value and see if the whole selling-this-s**t is a worthwhile thing to do. So if you have particular requests or want to know what I have in the way of (x), please send a message, or call me at 505-412-3277.

Thanks!
Carl

Ash Small

Thu Feb 14 2013, 01:41AM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

The links above don't appear to work.

(I'm not interested in buying one (international shipping, and everything), I'm just interested in how much you're selling them for.

)

zrg

Thu Feb 14 2013, 08:47AM

Registered Member #4762 Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93

Nice things. Very similar to what I've been doing some time ago. Aren't you afraid to damage the turbo pump with halogens? From my experience iodine can eat up the vacuum system with a great speed.

Ash Small: just copypaste the links.

Carl A. Willis

Thu Feb 14 2013, 03:53PM

Registered Member #9640 Joined: Wed Jan 16 2013, 07:53AM
Location: Albuquerque, New Mexico
Posts: 26

zrg wrote ...

Nice things. Very similar to what I've been doing some time ago. Aren't you afraid to damage the turbo pump with halogens? From my experience iodine can eat up the vacuum system with a great speed.

Links are fixed.

I worry about the iodine's corrosiveness, but the amount in use is tiny. I only fill to its vapor pressure of about ~0.3 torr. I would be much more worried about using bromine or chlorine because of the possibility for high throughput of these high-vapor-pressure halogens. So far, I detect no problems with the drag pump I am using. I have taken it off to inspect the rotor once, but that was after having perchloroethylene in a discharge and creating a lot of "gunk." It's a very robust pump and should have no problem with a little iodine.

-Carl

Ben Solon

Thu Feb 14 2013, 09:58PM

Registered Member #3900 Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600

Just a note, you'll probably be fine, but in the rules it states that you have to have at least 10 posts to buy/sell things here. It's just so that people don't turn up only to sell things to us. That's obviously not your intention, but just letting you know.

Anyways. Could I get a quote on a 250mL air(nitrogen) mix? Sorry to say that I can't afford to buy one at the moment, but I find those green ones really interesting, and I may have to get one in the future! Nice work, I read your post on them and find it really awesome.

Wolfram

Sat Feb 16 2013, 05:17AM

Registered Member #33 Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971

Don't worry about the 10 post rule. The reason we have it is to discourage people who join the forum only to sell things but this is obviously not the case here.

Oh, and I'm also bidding on the tubes.

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