I ran it for 30sec and it seams like it won't get overly hot if I have everything in phase. Yet, if I run it at 70% power, it gets hot twice as fast!?
Coiler Forever: Jeremiah Popp
Jeremiah,
It gets hotter at 70% power because the sparks are weaker and do not dissipate the power. The power reflects back to the tank circuit and much of it is burned up in the gap thereby heating it. Also the proper phasing depends on the power level, so running at a lower power may cause an incorrect phase condition at that lower power.