Did you need to use a diffusion pump to get below 10 microns ? Years ago I researched doing neon tubes, but got discouraged by the high-cost of the vacuum equipment and the dangers of bombarding.
On Sunday, October 24, 2021 at 11:32:33 AM UTC-7 Chuck wrote: > I distinctly remember some of Dalibor's first tubes from mnay years ago > when he first started experimenting. > > He made one that looked a lot like this one. Nice Work! > > Chuck > > > > > ---- Original Message ---- > From: "joshua dejaen" <[email protected]> > Sent: 10/24/2021 2:36:14 AM > To: "neonixie-l" <[email protected]> > Subject: Re: [neonixie-l] Re: Homemade Purple Nixie Tube > > Thanks for all the comments, sorry I could not reply sooner. > > I have added mercury to glow tubes in the past but I have not wanted to > contaminate my new pump. > > I could do it on my old pump but it is not able to pump below 1 torr and > the tube would be left with impurities. > > My electrodes consist of copper welded to tungsten with a nickel buffer > and then the tungsten welded to nickel wire that forms the digits inside > the tube. > > The tungsten forms the actual seal to the pyrex glass and the copper > provides a nice external lead. > > I heat up the tube with the torch while pumping for about a minute and let > it pump under high(ish) vacuum (5-10 microns) for 30 min. > > I then open the bleed valve and adjust the pressure until the glow looks > good and seal it off. > > I also have made Triodes in the past and those require about 15 min > heating with the torch on the pump along with an hour of pumping. > > > > > > > > > > > On Wednesday, October 20, 2021 at 12:49:28 PM UTC-7 [email protected] > wrote: > >> I don't recall for certain if it was NeonJohn or another guy, or even >> what group it was in. Could've been the old geigercounterenthusiasts group >> on yahoo. This was some time ago, when we were laughing about the insane >> overreaction to breakage of CFLs in school classrooms. I've never tried >> opening a tube in a controlled fashion myself, but have seen tiny droplets >> in broken ones, usually near the ends of the tube. >> >> Been playing with glass laser tubes a little the last week. Found that >> Gammex patient positioners used both red and green HeNe before diodes took >> over. Got one that won't lase though the plasma tube is a nice bright >> pink. It hisses or buzzes continuously but no beam output. The PS is good >> as it lit up a couple of similar size d tubes last night when I tried. I >> need to completely remove it and try sighting through the bore. It's >> possible it's leaking and coming up in pressure slowly and is now dead. I >> was looking at the metal evac/fill tube where it's crimped off and >> wondering about the possibilities of re-gassing... I have a couple of >> those metal tube ends with some defunct old tubes I got from Laser Sam a >> couple years back for experimenting. More interests, less time... >> >> >> On Wed, Oct 20, 2021 at 2:37 PM Mac Doktor <[email protected]> wrote: >> >>> >>> On Oct 20, 2021, at 2:59 PM, Nick Andrews <[email protected]> wrote: >>> >>> A guy built a device to try and capture the mercury, thinking he could >>> recover and build up a small supply. He found that he never could get any >>> significant quantity from the tubes. >>> >>> Did he condense the vapor first? >>> >>> >>> Terry Bowman, KA4HJH >>> "The Mac Doctor" >>> >>> https://www.astarcloseup.com >>> >>> “...the book said something astonishing, a very big thought. The stars, >>> it said, were suns but very far away. The Sun was a star but close >>> up.”—Carl Sagan, "The Backbone Of Night", *Cosmos*, 1980 >>> >>> >>> >>> >> -- >> >> >>> You received this message because you are subscribed to the Google >>> Groups "neonixie-l" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >> >> To view this discussion on the web, visit >>> https://groups.google.com/d/msgid/neonixie-l/4D0670A0-1C14-4185-8491-4629E387CD7C%40gmail.com >>> >>> <https://groups.google.com/d/msgid/neonixie-l/4D0670A0-1C14-4185-8491-4629E387CD7C%40gmail.com?utm_medium=email&utm_source=footer> >>> . >> >> -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/17081a57-50be-4398-85ba-fc7572f0e209n%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/17081a57-50be-4398-85ba-fc7572f0e209n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/85ac03d1-67b3-44fc-92de-2dc711c2e462n%40googlegroups.com.
