My vote is on "arcing over somewhere (maybe insulation breakdown in the disconnected wire to metal structure) maybe inside the coil itself. On the bench, when a coil is driven by quiet solid state switching components & I have no connection to the HV output, there is still an audible noise coming from the coil at lower voltages. Once input voltage is high enough, it arcs over the tower. Now, at those lower input voltages, is it internally arcing, or am I hearing lamination rattle, or what? Another bench observation: I have discharged a large capacitor through a SCR and associated connecting wire and even though there is no moving contacts & such, there is stoll an audible noise......what is that? Guess something somewhere is moving to make that noise.
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