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Sentinel TV with compressed picture
I realize your posting is old and you may have solved your problem by now. However, I recently completed restoration on a Sentinel TV-400 and discovered an inconsistency between the chassis and the Sams Photofact for that model: the Vertical Oscillator and Vertical Amplifier tube types are reversed. Make sure the 6SL7 and 6SN7 are correctly placed with regard to the label inside the set -- not according to the Photofact. I got the backwards and it created the symptom you describe. Good luck.
Phil
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