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Have you checked the B+ circuits in the set? An open input filter capacitor would yield low B+ and the symptoms (Low/No Vert sweep, 120Hz hum in audio) you describe would be the result. The input filter cap is going to be a two or more section can capacitor, usually rated at more than 350V.
I'd start by measuring the B+ feed to the vertical circuit, and trace it back to the power supply if it is low.
Cheers,
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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