Tech Square

• RE: Polypropylene or polyester - mcgjohn@yahoo.com 17:45:24 04/01/08 (0)
  In Reply to: RE: Polypropylene or polyester posted by ned664 on March 10, 2008 at 14:23:35

  Ned, I used to be a polyprop fan only. As a single cap, they do sound better (unless you go to teflon). Problem is when you use a bunch of them, they sure lean the sound out. as one poster suggests, use paper and oil. I use a mix of paper and polyester to make sure the sound does not get to lean. Nothing like getting done with a bunch of work on a piece, you break it in, sit down to listen to it, and ear fatigue sets in after 20 min.
  
  best
  john
  
  

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• RE: Polypropylene or polyester - Michael Samra 01:17:01 03/26/08 (0)
  In Reply to: RE: Polypropylene or polyester posted by ned664 on March 10, 2008 at 14:23:35

  paper in oil rather both of those for coupling..Take a read here.
  

  • http://members.aol.com/sbench102/caps.html   (Open in New Window)

  
  

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• I use both PP & PET.. - cheap-Jack 11:58:48 03/17/08 (0)
  In Reply to: RE: Polypropylene or polyester posted by ned664 on March 10, 2008 at 14:23:35

  Hi.
  
  Technically, the E/H hysteresis curve of PET (polyester, or polyethylene
  terephthalate) is very slightly less linear than PP, but is already much better than mica, & low voltage ceramic.
  
  I've used PP in hi-pass filters in loudspeaker X-over networks & signal paths where space is available. But for large cap values up to 10uF & low DC voltages, & space is not available, I've used PET (aka Mylar) as coupling caps in my tube & SS amps, even for the crucial phonostage I/P & O/P coupling.
  
  Sound pretty OK & PET is much cheaper than PP of the same large capacitance.
  
  c-J
  
  PS: FYI, paper in oil caps is most linear but really good ones cost a fortune.
  
  

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• RE: Polypropylene or polyester - unclestu52 11:05:05 03/12/08 (0)
  In Reply to: RE: Polypropylene or polyester posted by ned664 on March 10, 2008 at 14:23:35

  Polypropylenes are usually 50% bigger than the equivalent mylar caps. Imprtant where space is at a premium.
  
  Stu
  
  

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