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Andrew Davie

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Andrew Davie last won the day on September 12

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About Andrew Davie

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    Grumpy wise old wizard
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  1. Current DEV has a character error in the header bar on the left edge of the WiFi symbol, which is my fault. I am correcting it. So, if that's the wrong pixel you refer to, ignore that one.
  2. Just reminding you when you do find somethng... to get that polarity right. Some DC adaptors with barrel plugs have center positive, some negative!
  3. 1) The particular phosphor would need to be strongly magnetic. There is little to suggest phosphors used in CRTs are magnetic at all. 2) There would need to be loose/free/mobile non-degraded phosphor available inside the CRT. 3) You somehow have to be able to move that phosphor to the areas where you want it to be. 4) You have some mechanism to hold/stick it in place. I've replied since you asked me a direct question, but I'm not really interested in pursuing this further. There's probably a pretty good reason there's a scarcity of literature on repairing CRT phosphors. With regard to changing the ionic state via magnetism, my son, who has a degree in Chemistry, says... "I haven't really heard of magnets changing oxidation state, but if so what you'd be looking for is something along the lines of "magnetic redox/oxidation of phosphorus" or whatever compound is in a CRT... but to be honest redox chemistry (what you're asking about) is generally a chemical process" I will leave it at that. I don't particularly want to argue the point any more. Good luck with any experiments!
  4. That is good news! Can you hold off on it for a little bit, as @Al_Nafuur has purchased on on eBay and he has a better chance of understanding/fixing the issue.
  5. If you ever want to trade it.... me! me! I have a number of "development-type" cartridges; probably the only thing I could class as a '2600 "collection". I'd like to add the CC to the small grouping. Edit: Dunce me replied to a necro-post. Bah.
  6. TY. If the ones in the link don't have the posts, then they're not suitable. I've done literally hundreds of AliExpress transactions (well, I just checked -- 333 purchases) and I know well enough by now that any question like you suggest will either not be understood or answered randomly. In any case, could you please do a better pic/explanation of the missing posts so I know exactly what I'm looking for? Thanks
  7. Interested in having a go at this. Can you link to the switches somewhere so I know I'm getting the right part?
  8. Since I have read-up on, and mostly understand the mechanism of the darkening... and also since I have some formal training as a scientist... The ZnS phosphors in CRTs degrade through several mechanisms, including surface excitation and build up of electric charge. Reactions on the surface of such phosphors caused by bombardment with electrons are directly correlated to the loss of brightness. The specific mechanism of degradation is the reduction of the metal ions of the phosphor through captured electrons. The ionic phase of the phosphor is reduced to a non-ionic phase, which is what we see as a darkening of the phosphor layer. The darkening is proportional to the exposure to electrons (i.e., the degradation extent). So, you're left with a requirement for your magnet to convert the "dark" non-ionic neutral metallic phase to a positively charged (2+) ionic phase which can once again emit photons when bombarded with electrons. With magnets. Yeah, nah.
  9. The last two posts in that very same thread debunk the suggestion. In as many words, "ain't gonna happen".
  10. You should read other posts in this thread According to me, you do NOT want an inverted mask of the screen, but actually a positive mask. Where the screen is dark, you want dark. Where the screen is light, you want light. You effectively want to degrade the non-burned-in areas so that they are more like the burned-in areas. That's my theory. You can't "repair" the burned-in areas; the phosphor in those areas is no longer capable of glowing with sufficient luminance, despite how many electrons you bombard it with.
  11. Yep! They are graduated in size. If you want a more permanent fit, use a tighter tab. Colours/sizes are mentioned in the little paper key I sent.
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