Originally Posted by TrollDragon
The best thing would be to find a 12V 8A power supply if anyone wants to run the 6AS7 filaments in series...
Or for those who don't have a suitable 12V desktop PC power supply.....
I am using this laptop power supply, adequate to power the heaters of two 6AS7's connected either in series or parallel.
19V 4.74A AC Adapter Charger For Samsung Laptop for about $9.50 (includes AC power cord).
And I believe this regulator is similar to the one that Hypnos1 is using:
AC/DC 12-45V to 0.7-21V 8A Step-Down Voltage Regulator for about $8.25