Don't be in such a hurry to replace the guy's tube. Some tilt controls are on the back of the ACTUAL tube.
Call a good technician (you shouldn't be messing with it yourself, the adjustments are quite near the high-voltage part of the vaccum tube) and he'll tell you if there's a tilt control there.
Does this only occur when your TV is in 16:9 mode (i.e., are the movies anamorphic and you have to switch to this mode to see the letterbox bars)? If so, Selden might be correct - since some tubes behave quite badly when you compress them down to 16:9 mode.
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