Check my brain please

[lowend]

I haven't done any of this electric stuff since highschool, 25 years ago. Will somebody please check out http://www.diystompboxes.com/smfforum/index.php?topic=87044.0 for errors in my thinking regarding the power requirements of resistor(s) for dropping 300mA 9V down to 6.3V?  I made a bit of a %^&*up once already. I'm impatient to put the order in but I'd like to not blow it up too.
Cheers much.

[slacker]

Looks good to me. Why bother though the tubes run fine with the heaters in series running off 9 volts, or even better 12 volts.