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The use of polypropylene capacitors and their effect
https://el34world.com/Forum/index.php?topic=20836.0#:~:text=In%20some%20amps%20I%27ve%20heard%20polypropylene%20caps%20to,polypropylene%20caps.%20Metallized%20polyester%20will%20be%20smaller%20still.
Polypropylene or Polyester | Audiokarma Home Audio …
https://audiokarma.org/forums/index.php?threads/polypropylene-or-polyester.281421/
(edit) This quote may be dated: "Polypropylene capacitors are a mainstay for audio upgrades. Their quality is excellent, they're reliable, and there are now quite a few sources for them. For low voltage work, the 50V ECQ-P series from Panasonic (available through Digi-Key) is excellent, but they only go up to 0.47pF"
Measured Differences Between Capacitors for Audio Applications
http://conradhoffman.com/cap_measurements_100606.html
Measured Differences Between Capacitors for Audio Applications. ... Panasonic, 0.0082 uF, 50V, 2%, polypropylene- a common and inexpensive polypropylene from Digikey (discontinued) Acushnet, 0.01 uF, 600V, 10%, polyester (Mylar)- a very typical axial polyester ... this may explain the consistent dislike for polyester capacitors in the high end ...
polyester or polypropylene or other?? | diyAudio
https://www.diyaudio.com/community/threads/polyester-or-polypropylene-or-other.288818/
Aerovox makes a lot of high voltage polyester caps that are truly excellent in signal coupling use, for example, and probably better than many polypropylene caps. You can make some predictions based on the dielectric polymer, but you have to actually try it to know how a given cap will perform in a given circuit.
Audiophile Grade Capacitors
http://aeaaudio.com/audiophile-quality-capacitors-going-beyond-the-simple-re-cap/
The best capacitor types for audio circuits are polystyrene and polypropylene. Polystyrene is the first choice, but are only available in values up to .001 uF. Above that value, polypropylene is the type of choice, with nearly the same qualities of dissipation factor (DF) and dielectric absorption (DA) as polystyrene (these are the two capacitor “qualities” that most …
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