Do you also drive them with a variable cathode current? If I drive them with a reasonable current right from the start, they ionize just as quick as the other tubes, or at least I don't see any difference. But when I drive them on a low current it becomes obvious this 1 tube is sometimes very slow.
Jens, you ask "is it really strange", but even if I do time triggers with 1 minute intervals, the suspected tube still ionizes quickly. It's only when I leave it off for say 15 minutes that I see a difference. I would think that even after 1 minute the ionization will have come to a complete rest, or not? It seems like it is temperature related, that the gas needs to cool down for a relatively long time before the problem shows up. Michel On Sep 2, 1:40 am, kay486 <[email protected]> wrote: > I have noticed the exact same thing with all of mine LC-513 (Dolam) tubes. > When i pop them in a clock on the seconds place, they all the numbers tend > to flicker, some will have stable glow faster than others, it usualy > doesent take longer than 30 seconds for all o them to glow fine. I asume > that the multiplexing plays some role in this too. > Ive also seen some neon bulbs that have this sort of weir flickering on > them (im not relating to that AC flickering) the glow of one of the bulbs > in my clock tends to jump up and down on the cathode. If i have them turned > off for a longer time before turning on, the flickering is really slow, it > jumps up and down only like once per second, but soon after that it starts > to excelerate to a poin when it all really unstable, it jumps up and down > like six times per second! The weird thing is it happes only on one bulb! > The other glows just fine. Ive seen this on some youtube videos too, so im > not the only one. Does anybody know whats the problem with that? > > > > > > > > On Saturday, September 1, 2012 1:12:36 PM UTC+1, Jens Boos wrote: > > > Hi Michel, > > > > So basically it could be that if the pressure is higher than what it > > > ought to be, it is likely to be not visible once the gas has ionized, > > > but it may still affect the ionization time? > > > yep, that was my point. > > > > The strangest thing what happens is that if I leave this tube off for > > > a while (say 15 minutes) the ionization process is usually slow. On > > > the other hand, if I trigger a time reading just a few times after > > > each other, the first reading might be slow but all the next readings > > > will be just normal. > > > Is it really strange? Once an ignition has been triggered, there are > > much more ionized gas molucules around, thus making the next ignition > > much easier. > > > Jens -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
