Right, but I believe that would mean it would require higher voltage for the tube to reach breakdown potential and discharge, right?
On Wed, Nov 27, 2024, 7:27 PM liam bartosiewicz, <[email protected]> wrote: > They’re a great deal of videos on YouTube showing people making high > vacuum devices like vacuum tubes and X-ray tubes using normal dual-stage > rotary vane pumps. Seems like a functional nixie could be made without a > turbomolecular or diffusion pump, it just might not last as long. > > On Nov 27, 2024, at 2:38 PM, Miles Thatch <[email protected]> > wrote: > > Just wanted to roll back around to this point you made. > > I've watched a demonstration of a diffusion pump by Applied Science: > https://www.youtube.com/watch?v=SrNVLCHrJtY&ab_channel=AppliedScience > > Another video mentioned a diffusion pump not being a good suit in > application where avoiding contamination is key and Nixie making seems like > the sort of case scenario where contamination would cause failure in the > nixie. I could however be wrong. Would this make diffusion pumps unsuitable > as a starting point? > On Friday, September 15, 2023 at 11:01:45 PM UTC-4 gregebert wrote: > >> I'm not an expert on vacuum systems, but the units I see most-commonly >> for low vacuums (such as what you would see in a typical engine or vacuum >> cleaner) are inches or mm of mercury; higher vacuums are measured in >> microns. One Torr (1mm Hg) is 1000 microns. It's a tad silly, because you >> cannot physically measure 1 micron of Hg in a manometer, though at room >> temp the vapor pressure of mercury is quite low, around 2 microns. >> >> I'm guessing that nixie makers will use whatever high-vacuum equipment >> they can find and afford, and from the brief video shots the setups look >> like they use high-quality (expensive) equipment. Nothing looked cheap or >> kludgy. >> >> You can even use atmospheric air at low pressure to get a gas discharge. >> >> On Friday, September 15, 2023 at 9:01:27 AM UTC-7 Miles Thatch wrote: >> >>> > supposedly can get down to 35 microns >>> Is there a particular technical reason to not use the torr unit of >>> measurement when discussing vacuum? Just curious if it's just personal >>> choice or if there's a technical principal at play. >>> >>> > My plan is to do some heating/baking while the system is fully >>> evacuated >>> I have seen Dalibor do this in one of his videos. >>> >>> I've also seen it in this one as well at 10:24: >>> https://www.youtube.com/watch?v=uHv1f4_tDv4 >>> >>> Also here, another nixie making gentleman: at 6:57 >>> https://www.youtube.com/watch?v=MyhmEUw4OL0 >>> >>> > To do quality work, you will need another pump, typically a diffusion >>> pump, which will get you below 1 micron >>> I don't think I've yet seen any of the nixie makers talk about exactly >>> the sort of hardware they use, Just glimpses in an occasional camera shot. >>> Do you reckon it's what Dalibur and these other gents use? >>> >>> >>> On Friday, September 15, 2023 at 11:27:49 AM UTC-4 gregebert wrote: >>> >>>> I bought an A/C evacuation pump from Harbor Freight Tools that >>>> supposedly can get down to 35 microns; I dont have any equipment to measure >>>> anywhere near that low. It was a relatively inexpensive pump, around 80 >>>> USD. I think it's sufficient to do some experimenting. My plan is to do >>>> some heating/baking while the system is fully evacuated, then pressurize >>>> with enough argon (it's cheap and widely available) to get a glow. If I can >>>> sustain the glow for several minutes while heating the tube, I will pump it >>>> down a second time to hopefully get rid of any additional released >>>> contaminants, then refill. After I've made a few of these, I'll make a >>>> decision to continue spending time-and-money, or decide my experiment was >>>> enough to satisfy my curiosity and move onto something else. I'm definitely >>>> not going to build nixies. There are a few other things I want to make that >>>> require a vacuum and some glasswork, such as a radiometer. >>>> >>>> To do quality work, you will need another pump, typically a diffusion >>>> pump, which will get you below 1 micron and will be rather costly. The >>>> mechanical pump must first be used to pump down as much as possible, before >>>> the diffusion pump is used. >>>> >>>> On Thursday, September 14, 2023 at 9:24:05 PM UTC-7 Miles Thatch wrote: >>>> >>>>> Ok, that makes more sense. So in that case High Vacuum is required to >>>>> evacuate then. >>>>> >>>>> What sort of pump would I need to be looking for to achieve that? >>>>> >>>>> On Thursday, September 14, 2023 at 5:41:36 PM UTC-4 gregebert wrote: >>>>> >>>>>> OK, that's once the tube is pressurized with the desired gas. >>>>>> However, to cleanse the tube of impurities, it must be baked-out and >>>>>> evacuated to a rather high vacuum. Even at a high vacuum of 1 micron, >>>>>> there are still an extraordinary number of gas molecules present, on the >>>>>> order of 10^16 per liter. For home-made tubes I would actually want to >>>>>> re-evacuate the tube a second time, and refill, to get even more >>>>>> impurities >>>>>> removed. >>>>>> On Thursday, September 14, 2023 at 10:28:06 AM UTC-7 Miles Thatch >>>>>> wrote: >>>>>> >>>>>>> From he Drive books archive >>>>>>> Nixe Tube Data > NixieGas.pdf >>>>>>> >>>>>>> I was using the following excerpt from this book. Is it wrong or am >>>>>>> I getting something mixed up? >>>>>>> >>>>>>> On Thursday, September 14, 2023 at 11:43:46 AM UTC-4 gregebert wrote: >>>>>>> >>>>>>>> I think you mean 10-50 microns (which is 1000 timer lower), not >>>>>>>> 10-50 Torr. One atmosphere of pressure is 760 Torr (760mm Hg). >>>>>>>> I've seen neon-sign texts stating the need to get below 1 micron >>>>>>>> for proper bombarding, and I imagine nixie tubes are similar. >>>>>>>> >>>>>>>> On Thursday, September 14, 2023 at 6:57:51 AM UTC-7 Nick wrote: >>>>>>>> >>>>>>>>> Look at Dalibor's videos. >>>>>>>>> >>>>>>>>> On Thursday, 14 September 2023 at 12:08:57 UTC+1 >>>>>>>>> [email protected] wrote: >>>>>>>>> >>>>>>>>>> Good day. >>>>>>>>>> >>>>>>>>>> Since we require to reach vacuums of 10 - 50 torr depending on >>>>>>>>>> the gas mixture. What sort of vacuum pumps are we looking at >>>>>>>>>> sourcing to >>>>>>>>>> achieve those levels? >>>>>>>>>> >>>>>>>>> -- > 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, visit > https://groups.google.com/d/msgid/neonixie-l/49212b91-c353-4e5f-9f57-bf4722f1484en%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/49212b91-c353-4e5f-9f57-bf4722f1484en%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to a topic in the > Google Groups "neonixie-l" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/neonixie-l/AGvNPTx8ncs/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion, visit > https://groups.google.com/d/msgid/neonixie-l/C64BC66C-A29E-4911-8D08-151C52579926%40gmail.com > <https://groups.google.com/d/msgid/neonixie-l/C64BC66C-A29E-4911-8D08-151C52579926%40gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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