Ampohm Paper in Oil, Copper Foil CapacitorsAMPOHM Audio Paper in Oil, Copper Foil Audio Capacitors are specially designed for high performance audio systems. These capacitors are ideal for use in tube amplifiers and loudspeaker crossover networks where pure sound is at a premium. These AMPOHM paper in oil (PIO) capacitors are hand wound using high purity copper foil. They are oil impregnated before being assembled and oil filled. The capacitors are then hermetically sealed in an copper housing with phenolic resin and rubber end discs. Each lead is hand solder sealed to the eyelets in the end discs. The leads are 1.0mm in diameter and made of tinned copper. All AMPOHM Audio Capacitors are individually hand tested. Jon L of Enjoy The Music: ... when the copper foil version of the AmpOhm PIO's became available, I had to give it a good listen and compare to the other versions. After the obligatory burn-in period, I directly compared the copper version with the tin foil version, changing back-and-forth. I would say the difference in character between copper and tin is larger than between tin and aluminum, yet all three versions share similar presentations, which is no doubt due to the exactly identical construction except for the foil material. All share a well-balanced clarity with great detail resolution, at least for PIO's, and above all, music is well-served. This does not make it any easier to describe precisely how the copper and tin sound different, but I do have a few observations. With the copper, there is a little more attention-grabbing presence or copper-glow, mainly in the midrange, which can be described as slightly rounder yet with a fraction more detailing of the texture. Both female and male voices step forward half a step closer while the high and low frequencies remain similar to the tin foil version. This "mien," if you will, is mildly reminiscent of the Jensen copper PIO, yet the AmpOhm copper seems to have better clarity and extension at both ends of the spectrum.
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