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I would put a light bulb (maybe a #47) in series with the fuse, and mount the bulb where it's clearly visible when the set is operating. That way you'd have a visual on the current at any given instant. Maybe a video cam to record any sudden brightening while you're not looking.
If the fuse is going open without a current spike (no sudden brightening of the bulb), maybe it's just opening from 'running hot'.
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