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. 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