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Nick, you could try measuring the resistance of the 285V circuit (with the power off and any voltage bled off). It may measure low since you have a high-current problem. The next trick is to test the "other side" of each part that branches off from that line. One of them would likely measure lower resistance than the main circuit itself, and that would be where your shorted part is.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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