Can polystyrene caps replace my mylar and mica? - diyAudio
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Old 21st July 2012, 07:48 AM   #1
pshdk is offline pshdk  Denmark
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Default Can polystyrene caps replace my mylar and mica?

Hi. I'm real new to this and learning.

I'm doing a recap on a sony N80es amp and was wondering if I can replace the mylar and mica caps in the audio path with polystyrene?

I have read the dielectric sandwich is rolled together with the polystyrene, but this adds inductance limiting their frequency response to a few hundred kHz.
Would this have any negative influence on the sound of the amp? or could it influence the sound of the speakers?
I would just like to use one of the best types now that i'm doing the job anyway. Teflon is a bit to expesive I think.
Thanks,
Paul

Last edited by pshdk; 21st July 2012 at 08:52 AM. Reason: more information
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Old 21st July 2012, 09:33 AM   #2
SY is offline SY  United States
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A good quality PS cap will not be any more inductive than any other type. The disadvantages of PS are temperature sensitivity (heat will kill them faster than polypropylene, mica, ceramic NP0, or polyester) and size per microfarad.

The size issue often causes more problems than it "cures" in amateur modifications. Part placement, layout, and lead length are critical to performance, generally more critical than dielectric (audiophile hype aside).
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Old 21st July 2012, 09:41 AM   #3
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Flux removers may ruin them too. They're a little too 'dainty' for most gear.

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Old 21st July 2012, 09:52 AM   #4
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How so ?
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Old 21st July 2012, 11:04 AM   #5
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"How So?"
By dissolving the polystyrene. Trichloroethane flux cleaners of old certainly used to do that (as I vividly recall - once bitten, twice shy with that stuff) - dunno about the modern eco-friendly products available nowadays.

A
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Old 21st July 2012, 11:09 AM   #6
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I would recommend metalized polypropylene as the best compromise for many substitutions. The REAL problem caps are CERAMIC that are NOT NPO. Normally NPO caps are small value.
Mica isn't too bad. Perhaps not worth replacing.
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