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I'd check the vertical osc/output tube first, then the vertical output transformer. The most likely suspect is the tube, as eight out of every ten failures in older tube-powered televisions are due to defective tubes. Also, the vertical hold control may be open, as could the vertical height and/or linearity controls.
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Jeff, WB8NHV
Collecting, restoring and enjoying vintage Zenith radios since 2002
Zenith. Gone, but not forgotten.
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