Film cap dielectric

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crgfrench
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Film cap dielectric

Post by crgfrench »

Does anyone have an opinion for PPS vs Polyester for film caps?
It's for a stompbox build, not an amp, these are 0.1uF, 63V radial caps.
The PPS is more expensive, about twice the price of Poly, and it has a higher max operating temp (125 vs 105C)
Really I am wondering about the sound; would appreciate any thoughts if anyone has used the PPS.
Thanks!
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Re: Film cap dielectric

Post by JMPGuitars »

crgfrench wrote:
Fri 07/19/19 1:23 pm
Does anyone have an opinion for PPS vs Polyester for film caps?
It's for a stompbox build, not an amp, these are 0.1uF, 63V radial caps.
The PPS is more expensive, about twice the price of Poly, and it has a higher max operating temp (125 vs 105C)
Really I am wondering about the sound; would appreciate any thoughts if anyone has used the PPS.
Thanks!
I would say I'd be surprised if you could tell the difference, but read this: https://en.wikipedia.org/wiki/Film_capa ... capacitors

Both (and other) types are listed. That wiki implies that you may find more stability and better quality with the PPS. Whether or not that's noticeable in a pedal is a different story, and obviously the temperature ratings don't really matter either. If your pedal is getting that hot, it's probably mostly melted anyway, and your foot is on fire.
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crgfrench
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Re: Film cap dielectric

Post by crgfrench »

Yeah I'm not too concerned with the temp rating, I think I'll stick with the polyesters. Thanks!
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