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I'd say, based on experience, that the CRT is weak. The red and green cathodes seem to fail earlier than the blue. IF this is the problem, you might be able to buy a little time by re-tracking the tube. There are a number of "on the fly" procedures for it, since the book procedure doesn't work so well on a poor CRT. There should be 3 G2 controls and 2 Drive controls on the CRT socket board.
Quick procedure:
Turn COLOR to min, and tune in a snowy screen (no signal).
Turn PICTURE and BRIGHT to mid
Turn all 3 G2 controls to about 1/3 from min (looking from the back of the TV, so if you don't have a screwdriver small enough to turn through the holes in the board, that's opposite of course)
Turn the 2 Drive controls to mid
Turn the SCREEN control (on flyback in some, or a larger pot on the socket board to min, and then advance it til you barely (BARELY) see a the screen in one color. Leave it there, and go to the G2 controls, and turn up the one that isn't showing on the screen, and try for a grayish picture. Now give the TV a signal, and see if the dark areas of the scenes are still gray, and set the Drives to try to get the bright parts close to white. You can play with the G2s a little, and if overall too dim, you can nudge the Screen control up slightly, but not much, as that will overdrive the CRT as well as throw off all the adjustments again.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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