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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.
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
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 Component Research, 0.01 uF, 50V, 1%, polyester (Mylar)- an escaped aerospace component of excellent construction
metalized polypropylene vs metallized polyester ...
https://www.head-fi.org/threads/metalized-polypropylene-vs-metallized-polyester.33149/
11. This might help. For coupling purposes, non-metallized polypropylene, or Teflon (not practical) seems to be the best choice, but metallized polypropylene beats metallized polyester easily, and is available in the 5uf to 50uf range. In all of my universe I have seen no law of nature, unchanging and inexorable.
Audiophile Grade Capacitors - Analog Engineering Associates
http://aeaaudio.com/audiophile-quality-capacitors-going-beyond-the-simple-re-cap/
In our opinion, polyester capacitors should never be used in an audiophile system. Any amp using them in the signal path will benefit by from the substitution of premium polystyrene or polypropylene types. The best capacitor types for audio circuits are polystyrene and polypropylene.
Film Caps: Polyester vs. Polyprop. and Metallized ...
https://www.head-fi.org/threads/film-caps-polyester-vs-polyprop-and-metallized.36000/
There will be no difference. None. Nada. Only when ampere-level currents are being pushed through the capacitor does it make a diddly squat difference whether the plates are metallized (i.e. - a thin layer of aluminum sputtered directly onto the polypropylene) or foil, and even then the advantage translates into slightly less internal heating due to lower bulk resistance.
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