Ok, found something, old comments , maybe you knew that or not, that is not my thought but I found it truly resonable and explaining very well,that TPU is just EMP weapon based with a lot of coils wrap around to collect induced current. Ferrite or iron core required.
First comment;
"I have a guess on how a imploding crt could generate magnetic fields way above the usual levels associated with normal tv operation. Of course my theory is about as scientific as discussions of the star ship Enterprize's warp drive. In a article of Popular Mechanics magazine Sept 2001 issue. They discussed how a Electro Magnetic Pulse EMP weapon would work. It requires a collapsing magnetic field, usually you have a coil of superconducting wire, that is energized, and then you have a small explosion which forces a copper tube to progressively short out the length of the coil which causes a induced pulse to emerge from the other end. It sounds far fetched but their illustration kinda looks like a long deflection coil. I know a deflection coil isn't a superconductor but maybe it was struck by lightning at the moment it happened."
Second comment :
"Actually, these TV sets have a flawed design that under the right conditions inverts magnetically. Since they are plugged in when this happens, it causes the usual polarity of the wires running through the walls --which, like everything else, is normally aligned with the fundamental electro-harmonic resonance of the Earth's magnetic field, and therefore causes no problems-- to reverse itself. As soon as this polarity reversal occurs, the wires in the walls REPEL the nails, pushing them out of the walls at high speed, like bullets. This requires less energy than pulling them out would, since you are just reversing the direction that the nails were put in, using a reversed polarity. Since the wires are connected to the city's electrical grid, they have plenty of power available to do this; it is not dependent on what is inside of the TV; all that does is initiate the reversal. Then the power of the city's electrical grid provides the rest of the energy needed. Sometimes when this event occurs, the neighbors' electricity supply "stutters" a little. Ever had your lights flicker or your TV set stutter a bit? It was probably due to this happening somewhere nearby in your city. So you see, the nails don't get sucked into the TV, they get pushed out of the walls.
Once any one of them touches the TV, though, it discharges the imbalance and stops the process, much the way a spark from your hand to a doorknob discharges a static buildup. The kid was just unlucky enough to be in the path of one, before the first one hit the television.
At the risk of oversimplifying, perhaps the easiest way to explain this comes out of the movie "Young Frankenstein": You connect the plus to minus, and minus to plus..."
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