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If it a monochrome or color set? Mono sets typically have centering rings on the yoke, color sets typically have a control.
Is synch at black or white video level in your country? Here in the USA synch is black, and sets with poor synch detectors and vertical stages tend to loose centering or roll on letter boxed VS. native 4X3 content. Could be synch separator, vertical (more often drifted resistors/bad caps than tubes), or the AGC could be misadjusted.
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