Electolytic and tantalum capacitors have very poor audio characteristics and should not be used in the audio signal path.
Replacing electrolytic capacitors in the audio signal path of your amplifier or preamp with film capacitors will
improve sound quality. Polyester (Mylar) capacitors make a significant
sound improvement and are the minimum quality audio capacitors that should be used in the audio signal path.
Better are polypropylene capacitors, and even better are polycarbonate capacitors when
available. Polycarbonate film used to make polycarbonate film capacitors has been discontinued for several years, only a few companies have remaining stocks of
polycarbonate film which is expected to be exhausted in the next year or two. Polycarbonate film capacitors are preferred to polypropylene capacitors when available because they have a very balanced, musical sound with very little coloration. Polystyrene (also called styrene, styroflex, or styrol) are in many areas superior to polycarbonate, and are mostly new old stock as are our polystyrene, the polystyrene film has needed for manufacture of Polystyrene capacitors has not been made for years. The very best audio capacitors are polytetrafluorethylene (Teflon) capacitors, but they are generally very, very expensive and available in only a relatively few sizes.
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