The two filaments are pinned 4 to 9 and 9 to 5, with pin 9 as a center tap. One can apply 12.6 volts across pins 4 and 5, or 6.3 volts to pins 4 and 5 with pin 9 used for common (negative), or 6.3 volts can be applied to pin 9 with pins 4 and 5 used as common.
The two filaments are pinned 4 to 9 and 9 to 5, with pin 9 as a center tap. One can apply 12.6 volts across pins 4 and 5, or 6.3 volts to pins 4 and 5 with pin 9 used for common (negative), or 6.3 volts can be applied to pin 9 with pins 4 and 5 used as common.
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