The E-TBC double frequency verified !
i received a statement that the E-TBC show the unusual behavior compared to a normal parallel LC circuit where it provide a double frequency compared to it normal parallel equivalent LC circuit.
the device look like a parametric oscillator where the internal capacitor is divided into two identical capacitor in serial ... when oscillate the total capacitor of c/2 plus c/2 will be c/4 ! enter this to normal resonance equation so the result will be f X 2 !!!

it's 2N1711 you can look for it equivalent, or try another transistor suitable for oscillation purpose Google for it.
I even bought the original B&W coils and the 25khz 6kv 30ma supply wouldn't drive it. I built 2-3 of the Smith devices, and None of them worked like he claimed. The only device that Smith guy showed was in a black pelican case which was large enough to store a battery to support the length of time the demo of that device occurred over. I've also watched smiths claim where he uses the insulation tester on one side of a homemade capacitor and connects the other side to earth ground via spark gap and he draws arcs from the ground and calls that OU.
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