Motorola (I think) monitor only shows part of the image, a circle in the middle.

tbbk

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Motorola (I think) monitor only shows part of the image, a circle in the middle.

Ok, I have this black and white monitor (which I believe at first glance to be a Motorola, although the model number sticker fell off).

It is showing a perfect picture, but only in a circular area about 8 inches or so across. It isn't easy to take a picture of, but I tried anyway. It is most visible in the picture as the words vanish on the right.

Any ideas? Cap kit? Something wrong with the tube?
 

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Also, let it run for an hour and the viewable area doesn't expand any. Also tried the size adjustments but they just adjust the size of things within the area the monitor is bothering to show.
 
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