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The red and blue wires don't matter, I'd clip them. But cutting hte pins off het socket will disconnect the red and vlue wires as surely as cutting them, right?
This is not as complex as it seems. Grounding the grid of that tube makes it not do anything - the grid controls the tube after all. SInce the cathode is already grounded, it seemed a convenient place to use. But any ground will work fine. CLipping the red and blue wires will disconnect the tube from the high voltage power supply. That also will stop any function the tube might have had. The resistors and caps don't care if they have anything to do or not. That section of the dual pot now becomes irrelevant, so it can sit there or go away or whatever.
This is not as complex as it seems. Grounding the grid of that tube makes it not do anything - the grid controls the tube after all. SInce the cathode is already grounded, it seemed a convenient place to use. But any ground will work fine. CLipping the red and blue wires will disconnect the tube from the high voltage power supply. That also will stop any function the tube might have had. The resistors and caps don't care if they have anything to do or not. That section of the dual pot now becomes irrelevant, so it can sit there or go away or whatever.
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