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. 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