Jupiter Comet 0,047uf 600V Aluminium foil paper mineraloil capacitor. Aluminum Foil Paper-in-Oil delivers the classic sound sought after for decades. Comet Capacitors feature true hermetically sealed cases with mineral oil impregnation construction that dates back to the 1940s. Paper in oil construction is one of the original and most reliable oil types. Jupiter uses the finest quality highly refined USP-grade mineral oils, processed under a deep vacuum for several days. Hermetic sealing keeps oil from leaking out and provides protection from ingress of moisture to ensure long life. Glass to metal end seals are soldered in tin-plated brass tubes to form leak-tight joints. Jupiter Aluminum Foil Comet capacitors are built to Mil-Spec standards yet developed and refined for beautiful sound.