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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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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