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I would check the voltages at the cathodes and control grids on the picture tube. The CTC should go dark with brightness and contrast at minimum. Do you have retrace lines?
Check the low side of the screen controls also. I don't have my schematic for that chassis here at work. Does it have CRT bias and if it does, is it adjusted properly?
Chek the drive to the horizontal output tube but be careful, there is a good bit of signal on that grid and it may give some of the newer digital voltmeters a bad time and mess up readings.
I use a VTVM on the older sets. It stops me from buying new meters over and over.....
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