Re: [neonixie-l] OT: Looking for folks interested in 3l01i CRT discussion
@Chuck - Nightvision uses a much different tube construction; basically it's a photon amplifier that receives photons at one end (converts them to electrons), and the phosphor coating at the other end (electron to multiple photons). It's truly an ingenious device, and the second-generation tubes (microchannel electron amplifier) are even more interesting (and of course, more expensive). There are no deflection plates (or yoke) in (around) the tube. They are also much smaller than a traditional CRT. Sadly, nightvision tubes can suffer permanent phosphor damage from bright light (eg, laser), as I found out from a night-game of paintball [another story, but what an adrenaline rush!!] . -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/34e5170e-fd97-4253-9b1c-b9a4a204e55c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] OT: Looking for folks interested in 3l01i CRT discussion
That would not prolong its life for more than a few days. The screen is too small, there are no dead areas except between the ticks around the edge. The hands pattern visits the entire screen 24 times in a day. It gets more action at the center, near the hands roots, and that's the section that goes out first, leaving just the tips showing. There is no sign of burning - you can't tell a used tube from a new one by inspection. On Wednesday, May 16, 2018 at 9:39:45 AM UTC-7, GastonP wrote: > > A technique that could extend tube life would be to shift the image > lightly in a random way from time to time to even out. > As the deflection is 100% digitally controlled, it should not take much > effort to implement this effect. Just code in a random variable > displacement of the whole image every, say, 10 minutes or so... > > -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e2800808-861f-4cb8-bdd3-5b9fda533007%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] OT: Looking for folks interested in 3l01i CRT discussion
@Pete - Does the phosphor show any signs of burning when the tube is off ? Maybe the static pattern of the clock-face is the problem. I dont know much about phosphor degradation, but I cant help wondering if it's not 100% cumulative. For example, if one section of the tube is illuminated at 10% duty-cycle and another section at 100%, perhaps the 10% duty-cycle section might last *more* than 10X longer than the 100% due to heating or other effects. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7d037935-5cae-4c85-8207-5204f3df30dc%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] OT: Looking for folks interested in 3l01i CRT discussion
> I just bought a dozen 3l01i tubes from Yuriy and if there is anyone in this > group who wants to start a side discussion to share knowledge, send me a > private message and I will start a new google group. I'd send you a private message, but I'm not sure how... In any case, I'm interested. I have a few of these CRTs (of various vintages, the electron gun has been redesigned over time). I'm also curious whether the lifetime can be improved by changing the operating point (modifying the ratio of accelerating voltage versus beam current, while keeping similar brightness and spot size) like with magic eye tubes (detailed in the paper "Degradation of ZnS:Cu,Au,Al phosphor powder and thin films under prolonged electron bombardment"). I suspect it's not a surface layer phenomenon like in the eye tubes (since the phosphor is viewed from the opposite side that the electrons strike, and it's so thin), but it's worth a try. - John -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/096ACE39-755D-4FA9-9F3D-47D5B374E3F4%40mac.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] OT: Looking for folks interested in 3l01i CRT discussion
I just bought a dozen 3l01i tubes from Yuriy and if there is anyone in this group who wants to start a side discussion to share knowledge, send me a private message and I will start a new google group. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7ed11641-84cd-4c2e-95ba-671bd9f22270%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
