What kind of wattage does your tesla coils operate at? Most of mine only 
run at about 40 W. I just ripped out the power supply from a microwave 
oven that was rated for 700W and operates at about 15-20kv. Has anybody 
had problems with this? because I was thinking that the spark gap arc 
could draw too much current from the transformer an it would over heat 
too rapidly.