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a few things..
what are you using to check the voltages, a VTVM is best.
have you tried a known good osc tube 6FQ7
Note the grid circuit includes a voltage divider as part of the horz hold. Since the grid is too positive a good start would be to check the parts in that circuit,mainly the 22k resistor to ground from one side of the horz hold pot.
I would be scoping the cathode and check the free running freq (no signal) to see if its in the ball park.
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