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 - Talk of the Town: Diesel Vs. Gasoline - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I am in the market for an older tractor (to be read... cheap). I have been told a diesel holds up better than a gasoline engine as far a wear, tear, neglect and abuse. Since I am looking at older tractors that have probably been through it all, is it better to buy diesel? I do expect to have to do a good bit of work on
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