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That voltage you posted was the H output grid voltage right? Normally I use 'HO tube' to refer to the output and 'H osc.' to refer to the oscilator.
If the H out tube grid is not as negative as it should be by more than ~15% the osc. and the parts coupling it to the output tube are automatically suspect.
My approach would be to replace any resistors that are out of tolerance, change the caps, make sure the osc. coil ohms out similarly to the values in the sam's and that it don't look damaged, and perhaps most importantly get a strong osc tube in there.
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