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Go to a heating/AC contractor and ask them for a scrap of ductboard, all you need is a piece about 3 x 4 inches. They will have a dumpster full of it. Ductboard is a compressed fiberglass material with a foil facing. It's an inch thick. Use a long knife and slice through so you have a piece about 1/8 of an inch thick with the foil face on it. Glue that inside the top of your radio with the foil facing down towards the hot tube or tubes. Cooler top.
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Reece
Perfection is hard to reach with a screwdriver.
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