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By cleaning the remainder of the broken keyway from the tube base and properly installing this keyway replacement (a little dab of silicone sealant works great to hold it in place), your tube can safely be reinstalled into your equipment. Note: when using an adhesive to secure the keyway to the tube base, DO NOT use a water-based glue. Ruby Gold capacitors are used by many original amplifier manufactures in the Europe and the U. Ideal as replacement in vintage audio and guitar amplifiers.