i have wound my 8 inch secondary now . it is on acrylic tubing 8 inches in diameter and the coil length is 25 inches which came out to 888 turns of #22 wire. i plan to use 9,, yes 9.. 9000-30ma nst's.. should give me 270 ma at 9000vac.. my question is whay size cap do i need for the main.. my calculations came out to .067mfd am i right??????