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Dan:
Does the dark picture look normal otherwise? It it in sync and normal size and shape? Are you using the CRT from the TV or a test tube? Does the brightness control function normally? Lightly tap the CRT neck and see if the picture flashes back or streaks. If so, that's the trouble.
Otherwise, measure voltages on the CRT socket. The screen should be four hundred volts or so. The control grid and cathode will vary, but the cathode should be about 25-75 volts more positive than the grid. It will vary with brightness control setting.
Don
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