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You could probably apply 6.3V heater current to a voltage doubler, then apply the ~12VDC form the doubler to a simple LM317 based regulator circuit to drop it to 9V and eliminate ripple (with suitable caps in the input and output of the reg)... Just watch for DC potentials on the heater line from preexisting circuits, and Heater cathode breakdown voltages.
[EDIT] Seems others beat me to my first point...I still recommend having that active regulator there to reduce hum.
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