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If anything, the screen voltages are a little high. With the brightness control at minimum, there's still a slight image on screen. The HV just needs to be stronger, there's no way it should be sagging like it is. I'm trying to get more info on the drive waveform, I think it might not have enough amplitude to drive the output tube hard enough. Right now I'm looking at about 150v p-p, and thinking there should be more. 200v p-p sounds more like it, but I know little about this chassis.
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Evolution...
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