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If the gun bias is good and it passes Zeno's neon bulb test (a CFL will also work instead of neon if it's what you got) then it's probably a bad rectifier tube... you can check by connecting the blade of a well insulated screwdriver to ground and trying to slip it under the CRT HV suction cup...If you hear it arc there's HV if you can't there's no HV. If the neon says the flyback is making HV but there's none at the suction cup then the HV rectifier tube is bad, the heater winding/resistor feeding it is bad or the heater winding or HV lead has shorted to ground (insulation can fail).
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