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Well, the brightness is almost at max to get a viewable picture - I know this set sat dormant for some amount of time; I'll have to dig out the CRT tester to see if the tube is weak or I have other issues.
The focus control was maxed out too - turning that down helped a lot. I played with the thumbwheel and knobs on the yoke and eliminated most of the shadowing. Adjusting the color and tint does cause the picture to shift - radiotvnut suggested checking the resistors on the focus control board; a quick check showed two reading at twice their value but I didn't have time to take them out of circuit to get a correct reading. The interference is still there - I thought it may be the Atari adapter box but a new balun made no difference.
One thing I thought was funny was that there's a constant static noise coming from the HV anode cap the entire time the set is running.
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