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#1
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I did occur to me that the ions would be hitting the wall in a bent gun tube and since the ion trap magnet isn't strong enough to effect the ions much, they would never reach the screen. Even if the trap was mis-adjusted. I remember seeing a picture. maybe in that same book, of a gun element with a notch in the side of the aperture, produced by electron bombardment from a mis-adjusted trap.
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#2
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Other than a picture (or artist conception) in one or several tv repair books that many of us have seen, has anybody here actually seen an "X" shaped ion burn in real life? Under what conditions?
jr |
#3
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Quote:
Here's another interesting topic that I don't believe is covered here. What about the double ion trap magnets. A crt such as a 10BP4 calls for one. I have an RCA 8T 243 (that I am trying to get rid of) that I got with a 10BP4 and it had a single trap. It did produce a raster, but reading data on the set and the tube told me that it needed this double magnet, so I found one thanks to the Internet and possibly this site. Before the WWW, it would be almost impossible to find such an item. Anyway, it's still there and I never finished the set's slated restoration. I think I will snag the trap when I find a home for it. I will of course inform the new owner who will still be getting a heck of a deal. Point being, I never knew and still don't know what the double magnet does that a single doesn't and why some tubes call for one and not the other specifically. I bet there are a bunch of BP4 owners here that are running on a single trap with no problem.
__________________
"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free" |
#4
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This is an interesting thread, I hadn't thought much about it.
Whether the gun needs a double magnet probably just depends on the gun design. Its also possible the if the tube is rebuilt it might not have the original gun design. Seems like there were many types of gun designs. The people that designed the guns must have understood how the ion traps worked, some of that info must have been lost. Probably a lot of experimentation. 'Beam bender' does seem a more accurate term. Whether the 'burn' on a crt is made by ions and just were they come from to do the damage is a good question. |
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