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For no HV check power supply is good, H osc is working (look for sufficient negative grid bias on the output), make sure the paper caps in the horizontal are changed and that the width pot isn't open (or dirty enough to act open), and make sure the damper tube is okay. Once those are checked good if still no HV lift the HV rect top cap and try to draw an arc from it....If you get a healthy arc then the rect tube is bad, it's heater winding/heater limiting resistor is bad (open or shorted to ground) or the wire from the HV rect socket to the CRT is open or unplugged.
If no arc anywhere after all that report the control and screen grid voltages on the H output tube vs schematic. Screen grid voltage will tell you if the flyback is drawing power from the flyback and if it's got a partial short or open.
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