Here`s a Tesla-coil secondary to try: Wind 750 turns of 24-gauge enameled magnet wire onto an 18 long piece of 1.9 outer-diameter PVC pipe. The large coil has an inductance of about 2800 mH, with a self-capacitance of about 20 pF. One end of the coil should be earth grounded. Put a metal ball (a drawer pull knob or doorknob) at the other end. Now attach it..