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I would check for B+ voltage through the damper tube and flyback...remove the top cap from horiz output tube and carefully connect the voltmeter to the disconnected cap lead. If the flyback/damper are passing voltage there should be the B+ voltage present there and this means these components are likely OK.
If this checks out then check for a signal from the horizontal oscillator, check negative grid voltage at the HO tube and plate voltage at the oscillator tube etc. Also there is usually a damper fuse in this age of set so make sure that is OK too.
The horizontal output stage/flyback need to be working to develop the boost voltage.
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