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Dim picture?
Just food for thought. Before getting all wraped up about testing the crt it might be worth removing the front cover and cleaning the crt. This one I worked on had a fairly bright line before the vertical got fixed and a weak but useable raster afterwards. After the rest of the resto, I removed the front to get the HV connected to the crt I discovered the face of the tube was BLACK WITH DIRT? SMOKE? WHATEVER. After cleaning the picture looks like new crt. Might be worth a look see.
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