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I’ve had the same experience with equipment that used Sprague Atonms The blue aluminum electrolytics with axial leads. I used to own a dental laboratory which I opened in 1980. One furnace that I fire porcelain in heats a small chamber to 2000 degrees F. Since it was installed it’s never been turned off except for a week or two during vacations. It’s well ventilated with heat sinks to protect critical components. I’ve never bothered to check the capacitors as it still works the way it should nearly 50 years old now.
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