High freg converters of the type you are using have an adjustable spark gap under a flap some where or behind a window. Yours may need an adjustment. I also sometimes remove a gfi and replace it with a regular outlet, unless it is by a sink. By the way if you have one gfi in a circuit, all the receptacles in that circuit, become gfi. As far as being broadcasters, that is exactly what they are. They are used in tig welding to broadcast a beam of electrons from the end of the tungsten to the work, that the welding current can then follow, illiminating the need to "strike an arc". High freg has the aditional benefit of helping to break through Al-oxide, which is why there is a start only setting, for welding on dc. If you want to witness the broadcasting ability, point the tungsten at your finger from a half inch away (do not ground yourself) and step on it.
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