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Here's how the Gray Tube works

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Uploaded by on Jan 28, 2009

The power supply charges BOTH the HV cap on the front side directly AND the cap behind the inductor by jumping from the HV Rod to Grids through inductor to cap. This charging through the inductor will not make the effect of the coil pulsing for mechanical work.

When you close the switch at the LV side, the cap on the backside of the inductor discharges and smashes into the HV potential at the HV rod...the only place to ground is the LV rod...the diode placement as shown causes the cap behind inductor to discharge almost instantaneously. This is what causes the coil popping.

The HV rod is not used as a ground path so when the diode shuts off, the potential from the cap behind the inductor is free floating.

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