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Back in the 1960s, they sold a device that went between the damper tube base and its socket, placing a capacitor between the plate and the cathode of the damper tube. The device was used in cases when you didn't have enough width. They came in two values, standard and extra width gain. I suspect C106 is doing something similar. One thing I would check is the value of the 650 V boost line both with C106 in and out of the circuit. If it is close to 650 V with C106 removed, you should be OK to leave C106 disconnected.
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