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Just a little FWIW regarding the damper's floating heater winding. Since there is a high level pulse of a few thousand volts on the cathode, there's potential for heater-cathode arcing (a very common problem with damper tubes). By allowing the heater to float (rather than being clamped to ground like the rest of the heaters), the effective pulse level between heater/cathode is reduced, thereby reducing arcing potential.
Most sets don't use a dedicated supply to float the damper's heater. In fact this feature is found only in a few old high quality sets.
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