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That set should have a light brown pull-tab switch on the back, toward the bottom center, if it's a CTC-92 or 99. That's the "service-normal" switch. If it's not making contact, it will make only a white line across the middle of the screen. Try gently working that switch in & out a few times, as they get corroded contacts. If it's a CTC-81, there is a black slide switch on the back near the top center, where all the service adjustments are. If you put a picture of the set, or the chassis number (CTC-___), we can probably offer better tips. If it's a CTC-81, you likely have a bad filter capacitor, which needs a little electronics skills to replace. That was very common on that set, if that's the chassis you have.
CAUTION: If you let that line sit there, it will burn a permanent dark line through the picture. If you're going to fool with it, turn the brightness and contrast down to where you can barely see that line, and that will protect the tube somewhat from damage.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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