Looking for a good filament transformer. 10 Volts, center taped at 10 to 12 amps. These are used on the old 866/3B28 power supplies. Want to complete this project before spring. My own design.....pair of 813's running AB1. I know, why don't I go to solid state, well, just want to be able to keep my coffee cup warm on the cabinet. Regards, Gary...WZ1M