Greetings, Have heard lots of folks using 1/4 in. ref. tubing for the primary winding. I have a roll, 60#, of 1/4 in. solid copper wire. Is this satisfactory to use?? Also, using the Wintesla program, I find that my secondary has a resonant freq. of almost 400 khz. with a toroid. { 2 1/2 in. dia. x 24 in. coil length. } This sounds a little high to me. What do ya think? I can already feel the hair standing up on the back of my neck. Thanx George