Tube Swap - Yoke & Rings Issue

bungy

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I'm in the middle of a tube swap with a G07 but I can't get it converged. I know the procedure and I can converge most monitors pretty easily, but I've run in to a problem with this one and I'm not sure what to do.

The donor tube's yoke did not match, so I'm using the original G07 yoke. The donor's purity rings were connected to the original yoke. I marked the rings positions and the position on the tube before I removed them. Then I used a Dremel and cut the ring assembly off the original yoke.

I put the G07 yoke on the new tube and push it up to the wedges. Then I put the rings on, but they don't go up to original position on the neck. Turning on the monitor, the colors look ok as in the yoke is in the correct position, but the convergence is all out of whack. It seems I can adjust the top half of the screen to be ok, but then the bottom is all whacked out. Like unnacceptably whacked out. And vice-versa. There is no middle ground as the whole monitor will look messed up if I try to compromise on either side.

If I take the wedges out and push the yoke all the way up, the rings go up to the original position and the convergence is a dream. But the colors are all messed up because of the yoke position. No amount of manual degaussing will fix it.

If the yoke is in the correct position, the rings need to move up exactly the length of the yoke clamp. The best I can come up with is to Dremel off the yoke clamp, and epoxy the ring assembly to the yoke. I doubt the tube will ever have to be swapped again, but you never know, and I hate making permanent alterations for things that might not be permanent.

Has anyone ever run into this problem? What would you do?
 
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Well, I'd try the G07 rings first.

I've had this issue before. For whatever reason the yoke can't sit perfectly on the tube without giving funky colors, and if you back it off, you have issues with the convergence.

In the past, I've backed the yoke off just until it barely goes to good colors, then tightened it - then messed with the convergence to get as close as possible...
 
Well, I'd try the G07 rings first.

I've had this issue before. For whatever reason the yoke can't sit perfectly on the tube without giving funky colors, and if you back it off, you have issues with the convergence.

In the past, I've backed the yoke off just until it barely goes to good colors, then tightened it - then messed with the convergence to get as close as possible...

I tried the original G07 rings, but it's the same result. Maybe I should just look for a spare G07 yoke to keep on hand, and then modify my yoke.
 
your tube is a 90 degree deflection correct?

Yeah, everything checks out for this tube. It's the second one I've tried so far with this chassis / yoke. Both tubes wouldn't converge the same way.
 
I've been having some trouble with G07 yokes and new CR-23 tubes myself. Same problem. I've almost decided not to do tube swaps on G07's unless I find a matching yoke...
 
This is what I ended up doing. I used a dremel to make the tabs that the yoke clamp goes around thinner, and I also ground down the inside of the ring assembly. Now the rings fit over yoke and are in the correct position. With three wedges, the yoke is snug and immobile. If I had to I could go back to the yoke clamp in the future. The convergence isn't perfect, but it's acceptable.

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Old tube vs. new tube. The old one was putrid, well worth the hassle of swapping.

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