25" Amplifone/Wellsgardner Vector Monitor Yoke winding and information

The candidates for the project at these two yokes. I have previously wrapped them similarly and then. Rewraping one with a formula developed for the 19" yoked derived from backwinding a donor Amplifone yoke. The one on the right was an older wind and the one on the left is new formula with more turns and extra turn on the cross back.

I will start by comparing the one two the other and then rewind the one on right to try and get matching results. Notice how one yoke has lager ferrites than the other yet the one.

To start the 6100 Horizontal ohm reading is 1.3 ohms. The Verticle wind I am trying to match is 0.6 ohms.

The one I am working with today is 1.0 on the Horizontal and my first wind on the Verticle is 0.6. Problem is not enough winds and geometry is off.


Wire size on 6100 yoke 0.46mm or 0.018" looking for proper wire size I believe I m looking for 24MAG WIRE. I have some previously used wire, I hope I have enough for a set. This will be my first real attempt to match this yoke as it's own process rather than using formula for other projects.

With the settings the same on the PAT9000 the geometry is way different, the Horizontal is close but the Vertical wind is off. This must be corrected by adding turns to match the 6100 yoke. The actual box is very close to be usable wind but we're going for consistency and repeatable results here, so I will re wind this yoke to see if I can better match the original equipment. Pretty happy with the projection just wish the sizing was closer.


All of these comparisons will be done without any convergence, basic purity and NO Strips.
 

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I seem to be missing some photos. Here is the first pass, neatness counts. The center is not where it appears to be so it is marked out to show where center will be when assembled. I think? About half way through the count is off. I need 30 turns per Quarter. Have to unwind and add the extra turns.
 

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30 turns 1 turn to cross the Quarter, then 30 more turns. 1 1/2 turns to get back to the beginning and repeat. This will be the current formula I am following for this set.

This looks better, neatness counts.
 

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I think I finally finished one side. You can see where the side is offset from the centering notch for the yoke. In total 120 turns + 2 1/2 gained in crossing and going back for second half.
 

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Finished the other side. Counted all turns and I think they are equal on all quarters. The last quarter of second side seemed to have one or two too many winds so I backed off one turn and split the difference. I hope that the extra turn on the back wind of the 19" yokes is not necessary on the 25" tube. It really seems to help with those 19" yokes I was winding. So now I solder up the yoke and put it to the test. Each half measures 1.2ohms and tied together I get 0.6/0.7ohms, hitting the target. Once soldered up I will compare the 6100 yoke one the yoke tester to the newly wound yoke.
 

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6100 Ring Test.
Position 1. 6
2. 8
3. 12
4. 18
5. 20
6. 12



Hand wrapped
1. 9
2. 11
3. 15
4. 21
5. 23
6. 16


Really hard centering up the sides with the "keys" being offset on the ferite's, zibhope the geometry is correct.Well Here I go.
 

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Well things look good with geometry. The guns line right up and it seems good. Only a little fuzzy may be able to adjust it in but so far I like what I see. No strips no time spent just put yoke on tube, co convergence and no purity adjustments at this point. I will work with this and try a different chassis to see if the results are the same.
 

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Realized the fuzzy was my focus pin in kneck connector was bent an no connection. After fixing and minor adjustment it looks great. I have a tube to use, Hooray. No strips basic purity and a quick convergence. I think with some time anyone would be happy. Now to see if I can reproduce this outcome with yoke #2.
 

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Unwinding yoke #2 and I realized this yoke was an original 1st try, I wrapped up an extra 10 turns on each end at the beginning and at the end, this could be why I was not getting the guns lined up at the edges.? It was also wrapped centered on the ferrite and that is not centered on the yoke. So I marked out the center lines on the ferrites and they should be better in line with the Horizontal when assembled. I can't stress keeping things aligned and counted out equal.

I have found that I now have possibly 2 more yokes from 25" tubes, so if this one turns out proper I will buy more wire and wrap them all.
 
So yoke #2 turned out good too, maybe not quite as good but still usable results. Better than the previous wind on the same yoke. So I now have 2 x 25" Amplifone tubes to use and another one that I now need magnet wire to wrap an additional two yokes. This seems to be a working formula for 25" tv tubes that have an appropriate Horizontal wind resistance as that will be the measurement most people will be comparing. If I get a third tube working I will put it up for sale, PU here in the SF Bay Area.
 
Here is the grid for yoke #2 and the strips used for convergence. This is very close and plan to get almost perfect. Will use this tube for my Frankenstein StarWars. And the other for the multiVector.
 

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I mounted the other 25" tube in the MultiVector cabinet and it looks pretty good. Although I think the yoke moved a bit as the picture seems a little out of square which it was spot on before. It did keep the convergence better than the StarWars tube tho I am very happy with the outcome of both projects.
 

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Wow, I can't believe that fit in there
I am using the "Amplifone Ears" created by Takeman I bought years ago, advertised as for StarWars cockpit. Which must be the same width as a regular game unless there is a wider CP and wider plastic bezel which I don't think is the case.
 
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