The control would probably be called vert centering...That set may lack such a control...I'd have to dig out the schematic for a look.
You may also be able to improve it with the height/linearity controls...You'll want to have a crosshatch test pattern on the screen or end credits to a movie with evenly spaced text lines...Adjust for minimum vertical overscan AND even spacing of the lines from top to bottom (don't want everyone to become coneheads).
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