Get 12.6vcc from 6.3vac

Hello! I'm a new member here . . .

I need 12.6 vcc for a 12av6 vacumm tube's filaments, and I want to get it from a 120/6.3 transformer. I think a voltage doubler would give me more than that . . .

any idea?

Thank you!

Here are two circuits, either of which might work. These were optimized for 50Hz line.

eternally grateful