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I was using only 100 watts when I burned up the toroidal inductor in my Ten Tec tuner which is rated for 200 or 300 watts. I forget but either way if the inductor burned up it was not even close to handling it. BTW when I say it burned up I mean that. When I hit the tuner with 100 watts there was a SNAP! followed by smoke coming from the inside of the tuner. When I opened it up and keyed the mike again there was another SNAP! and the plastic form holding the inductor caught fire and continued to burn until I blew the flame out. I suspect it self extinguished inside the closed case due to lack of air. The smoke was really black and putrid. I can't imagine what the caps/inductors and switching relays in an auto tuner would react like. A 3:1 ratio is not nearly as good as I would like when it comes to reactance voltages which can hit several thousand volts in a tuner when trying to match some impedances.