Magnavox 25" CRT Tuner Prob?

Have a 25" Magnavox CRT TeWee Chassis 25X605-00BB. This has a zillion hours on it; still runs/displays like new. It's on a digital converter, so always on CH3. Starting a couple weeks ago, on cold start, the picture jitters for a few seconds, then stabilized. Now, on cold start, the picture is scrambled with diagonal, horizontal slant. The audio is OK, but overlaid with a high frequency warble, which modulates with the shifting video scramble. The channel stays locked on CH3. After about 2 minutes, the picture snaps clear, and the set runs fine until shutdown. Since it has no screen drive problems, I assume the tuner is failing. Would it be reasonable to consider replacing the tuner. JR

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