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G1 is supposed to be 0V. It should have a 1M resistor connecting it to ground and it also has a cap connecting it to something. It sounds like G1 has become positive with respect to cathode in your set....that will give you 150% brightness regardless of brightness control setting on cathode.
Check the 1M resistor on CRT grid G1 for open and the cap that goes to G1 should be changed or disconnected.
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