Hi Nick, I have never seen any Chinese Nixie tubes doped with Hg, I am also curious why, maybe it's limited by the level of technology at that time in China.
在2021年4月2日星期五 UTC+8 下午11:39:41<Pramanicin> 写道： > Yan, were any of the QS30-1's or other Chinese tubes doped with Hg? > > On Fri, Apr 2, 2021 at 8:36 AM 严泽远 <[email protected]> wrote: > >> There was a huge warehouse in China, but now it's running out. The price >> of QS30-1 is around 2RMB 10 years ago, but now it's near 30RMB/pcs >> >> 在2021年4月2日星期五 UTC+8 上午4:07:59<David Pye> 写道： >> >>> Please tell me there is a huge warehouse in China that will start >>> selling their stocks to bring the worldwide Nixie prices back down again! >>> >>> David >>> >>> >>> >>> >>> >>> >>> On Thu, 1 Apr 2021, 17:59 严泽远, <[email protected]> wrote: >>> >>>> There're over 17 different versions of Chinese QS30-1 tubes (SZ1-1, >>>> SZ3-1, SZ-8 are all same with QS30-1 but different brands), just curious >>>> which one you tested. >>>> Check the pictures here: https://www.nixieclock.org/?page_id=3162 >>>> >>>> [image: qs30-1.jpg] >>>> >>>> 在2021年4月1日星期四 UTC+8 上午7:26:11<David Pye> 写道： >>>> >>>>> Surely you've effectively got 10 of those resistors in parallel so the >>>>> tube current is 10x rated.... >>>>> >>>>> Poor old anode.... >>>>> >>>>> David >>>>> >>>>> On Wed, 31 Mar 2021, 23:02 Jon, <[email protected]> wrote: >>>>> >>>>>> You're putting AC across the tube? In addition to what Paul said, >>>>>> think about the scenario in the negative half-cycles. There you've got >>>>>> ten >>>>>> 'anodes' (the display digits, normally cathodes) each with their own >>>>>> resistor pouring current through one 'cathode' (the normal anode >>>>>> box/grid), >>>>>> which is definitely not sized for that current flow nor designed to have >>>>>> the glow on it bombarding its surface with lots of energetic particles. >>>>>> So >>>>>> all bets are off on tube behaviour in my view. >>>>>> >>>>>> In either polarity of the cycle, the common electrode might be >>>>>> seeing 22.5mA through it if your initial calculation holds. But very >>>>>> likely >>>>>> it doesn't, because that calculation assumes the normal tube maintaining >>>>>> voltage which I would have no confidence in being the case under these >>>>>> conditions. If the maintaining voltage drops significantly when the tube >>>>>> is >>>>>> run like this, then your current flow will be even more than you >>>>>> calculate. >>>>>> Maybe that's how you get to 9W. >>>>>> >>>>>> Ouch. Wouldn't bother putting that tube in a clock! >>>>>> >>>>>> Jon. >>>>>> >>>>>> >>>>>> On Wednesday, March 31, 2021 at 10:34:06 PM UTC+1 Paul Andrews wrote: >>>>>> >>>>>>> You should calculate the anode resistor you need for one segment. >>>>>>> Use that, then connect all the cathodes to ground. I have done this >>>>>>> many >>>>>>> times accidentally. Now the hand waving part: Imagine the connection >>>>>>> between the anode and cathode is a resistor and you connect all of the >>>>>>> cathodes together - you are putting all of those resistors in parallel. >>>>>>> You >>>>>>> are limiting the current on each one to 2.25mA, so you are pumping >>>>>>> 22.5mA >>>>>>> through the one tube. I get that to be about 2W - (230-140)*0.0225. >>>>>>> >>>>>>> On Wednesday, March 31, 2021 at 4:11:49 PM UTC-4 gregebert wrote: >>>>>>> >>>>>>>> Very interesting; thanks for posting. >>>>>>>> >>>>>>>> You might want to try successive numbers of lit cathodes, say 01, >>>>>>>> then 012, then 0123, etc and see how the current increases, and also >>>>>>>> see if >>>>>>>> it changes over time due to heating. >>>>>>>> >>>>>>>> I dont recall seeing this behavior with segmented tubes, like the >>>>>>>> 7971. In fact, on my clock I have a current regulator on each cathode, >>>>>>>> and >>>>>>>> another one for the anode, for every tube.....that works out to 128 >>>>>>>> current >>>>>>>> regulators on that clock. >>>>>>>> >>>>>>>> On Wednesday, March 31, 2021 at 12:18:08 PM UTC-7 Bill van Dijk >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Just a guess, but I think by lighting them all up you get some >>>>>>>>> kind of “super ionization” in the tube, which could then increase the >>>>>>>>> current and heat dissipation. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Bill >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> *From:* [email protected] [mailto: >>>>>>>>> [email protected]] *On Behalf Of *Yohan Park >>>>>>>>> *Sent:* Wednesday, March 31, 2021 3:15 PM >>>>>>>>> *To:* neonixie-l <[email protected]> >>>>>>>>> *Subject:* [neonixie-l] Lighting all digits at the same time: Why >>>>>>>>> does this happen? >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> I have a few Chinese QS30-1 tubes lying around which don't have >>>>>>>>> much value for me and was wondering how it would look to have all >>>>>>>>> digits >>>>>>>>> lit at the same time. >>>>>>>>> So I looked up the specs which say 170V and 2.25mA >>>>>>>>> So I calculated the needed resistor to have it hooked up to 230V >>>>>>>>> which is a little below 27K >>>>>>>>> I then connected a 27K resistor to one cathode and it lit >>>>>>>>> perfectly fine (230V AC so the anode also glows). >>>>>>>>> So I then connected 10x 27K resistors to all the cathodes and >>>>>>>>> plugged it in. >>>>>>>>> Holy Moly! The thing lit up like crazy and was drawing over 9 >>>>>>>>> Watts and was getting VERY hot. So I turned it off again after a few >>>>>>>>> seconds. >>>>>>>>> Can anyone tell why it's behaving like that? >>>>>>>>> >>>>>>>>> -- >>>>>>>>> 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/bffb114c-9810-4d65-8e98-ee13f6c860fcn%40googlegroups.com >>>>>>>>> >>>>>>>>> <https://groups.google.com/d/msgid/neonixie-l/bffb114c-9810-4d65-8e98-ee13f6c860fcn%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/c8c35a61-fa0a-4249-9311-47061c50865cn%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/neonixie-l/c8c35a61-fa0a-4249-9311-47061c50865cn%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/12ad2419-424c-4b08-a58a-074901cb4bf8n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/neonixie-l/12ad2419-424c-4b08-a58a-074901cb4bf8n%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/87f95d50-d622-408e-8a72-f54ffe2733b5n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/87f95d50-d622-408e-8a72-f54ffe2733b5n%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/4bdf7787-1e9a-49b8-93c0-c89b23789104n%40googlegroups.com.
