WG 4600 Tube Degauss Issue

jimk

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I've had a WG 4600 sitting on the self for over a year. It was a tube swap project I just never got around to finishing until tonight.

Anyways, I fire it up and get a nice shaped picture with good color, but it's badly in need of degaussing. So, I get my coil out and hit if a few times and a few times more. No matter how many times I use the degauss coil the picture never clears up completely. I can move the color distortion around and that is it. It's especially bad on left side. I've tried moving it and unplugging the built in degausser with no effect. I don't think the frame has been magnetized, but who knows.

Any ideas how I can correct this issue?
 
This is my first tube swap and I left the rubber wedges in place from the original yoke. I'll try removing them and resetting the yoke.

Thanks!
 
To adjust the yoke for proper color purity, you need to display a solid red pattern. You can use either a gameboard that has a video test menu or use a monitor pattern generator.

After loosening the yoke clamp screw, slide the yoke forward or back on the neck slightly until the red picture is pure with no discolored spots. Don't spin the yoke.

Now carefully tighten the yoke clamp snug. Don't overtighten or the tube will shatter!
 
To adjust the yoke for proper color purity, you need to display a solid red pattern. You can use either a gameboard that has a video test menu or use a monitor pattern generator.

After loosening the yoke clamp screw, slide the yoke forward or back on the neck slightly until the red picture is pure with no discolored spots. Don't spin the yoke.

Now carefully tighten the yoke clamp snug. Don't overtighten or the tube will shatter!

Yep yep, and I'll be the first to say it... but God bless Williams' boards. I don't have a generator, so when I need to test/adjust a monitor... I have super long wires on Robotron, so I just reach in and up, and pull the wires out of the front of the cabinet, then work on the project monitor there.

The grid screen gives me a "good enough" for convergence, and the color ram tests give me my colors for screwing with yokes. :)
 
Yep yep, and I'll be the first to say it... but God bless Williams' boards. I don't have a generator, so when I need to test/adjust a monitor... I have super long wires on Robotron, so I just reach in and up, and pull the wires out of the front of the cabinet, then work on the project monitor there.

The grid screen gives me a "good enough" for convergence, and the color ram tests give me my colors for screwing with yokes. :)

Hehe. I don't have a monitor pattern generator either. But I DO have a Mortal Kombat board and my Jamma test rig. Mortal Kombat has the red, green and blue test screens, as well as crosshatch and color bars.

To the OP - yes, it definitely sounds like you need to do a purity setup.

-Ian
 
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