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polypropylene capacitors
polypropylene capacitors
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Old 16th October 2019, 04:42 PM   #11
RickTH is offline RickTH
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Quote:
Originally Posted by DF96 View Post
Those tests appear to show that distortion was below the measurement threshold for all film caps, so in what sense is MKP the best - based on those tests? DA does not count because DA does not affect audio.
True about the distortion , but since this was an arcticle from 1991 , and the way they measured the distortion (at 250hz ) , I wouldn't trust it too much. Elektor says that DA does have an influence on the sound quality .

C0G are only for pF & nF , where best choice is styroflex (polystyrene).
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Old 16th October 2019, 04:49 PM   #12
RickTH is offline RickTH
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Kemet F461 , but only 2,2uF.
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Old 16th October 2019, 08:16 PM   #13
mchambin is offline mchambin  France
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Film caps.
Voltage 50 / 63V ( small size ).
10μF and more.
High insulation resistance ( low leak ).
Affordable.
Availability is troublesome, findings are welcomed.
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Old 16th October 2019, 08:51 PM   #14
RajkoM is offline RajkoM  Bosnia and Herzegovina
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If you accept NOS, I only know about "Iskra" oval - KCU polycarbonate type. Search in Slovenia.
As far as I know, "Iskra" copied German ERO capacitors.
Polycarbonate is a great sounding capacitor.

Philips HQ-MKC is superior, but I don't know that there are below 100V. I use 9,2 uF/100V.
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Old 16th October 2019, 11:10 PM   #15
gabdx is offline gabdx  Canada
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I love polycarbonate caps, they sound awesome
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Old 17th October 2019, 12:29 AM   #16
wrenchone is offline wrenchone  United States
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I use low voltage polycarbonate caps when I can find them for applications where I need small size, and can live with a low voltage rating. Polycarbonate is tougher stuff than polypropylene, so you can used thinner films and still tension them properly. I grab Wima and ERO MKCs when I can find them. I also have a bunch of Sprague polycarbonates back from when dinosaurs roamed the earth...

I will mostly use them as input caps and as coupling caps in a "Nakamichi" type feedback arrangement (anything to avoid putting an electrolytic in series with my feedback network).
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Old 17th October 2019, 01:27 AM   #17
jackinnj is offline jackinnj  United States
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polypropylene capacitors
Quote:
Originally Posted by wrenchone View Post
I also have a bunch of Sprague polycarbonates back from when dinosaurs roamed the earth...
Did you see this? Sprague 632P 10uF 50V Metalized Polycarbonate Capacitor for sale online

I have about 50 of them I purchased from an electronics defense firm in the early 2000's -- less than the cost of one piece. I use them as input caps.
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Old 17th October 2019, 01:49 AM   #18
asuslover is offline asuslover  Romania
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polypropylene capacitors
Polyphenylene Sulfide (PPS) are very good , but not cheap.
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Old 17th October 2019, 11:47 AM   #19
DF96 is offline DF96  England
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Quote:
Originally Posted by RickTH
Elektor says that DA does have an influence on the sound quality .
DA is a very low frequency phenomenon and appears to be linear so that is two reasons why it cannot affect audio. However, it is conceivable that DA is correlated with some other unidentified dielectric problem which does affect audio. If so, nobody knows what it is and blaming DA diverts attention from whatever the real issue is. Personally, I suspect that people are just afraid of DA without actually understanding it and so 'hear' poor audio with a high DA cap - but only when they know DA is present.
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Old 17th October 2019, 12:04 PM   #20
RajkoM is offline RajkoM  Bosnia and Herzegovina
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107$ for ONE 632P .... fdhgzjdkduuuuuuuuhhhhh. Unbelievable !!!!
Even better MKC from ERO or Wima still exist and cost 5-6$ for same capacitor value.
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