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Welcome Dave. You are correct that you have no vertical deflection. The vertical circuit is fairly straightforward: oscillator, output amp coupled through a transformer to the yoke.
Here's the order in which I would check items:
1. vertical stage tubes
2. get a schematic and check voltages on the tubes.
3. use an oscilloscope to check the waveforms.
While you have no vertical deflection, be sure to keep your brightness very low so you can barely see the horizontal line. Otherwise, you could burn the phosphor on the CRT and have a permanent horizontal line.
Also, until you replace the capacitors (especially on the power supply chassis), do not leave the set unattended while turned on and pay special attention to the power transformer. If it starts to get too hot, you may need to immediately replace those electrolytic capacitors.
Good luck.
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