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Old 14th August 2013, 03:20 PM   #31
DF96 is offline DF96  England
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Silver mica caps are usually very stable, but I'm sure I read somewhere that they can sometimes have sudden (but small) changes in capacitance. Not likely to affect audio, but could be a problem for their usual use in radio circuits.

I once had problems with some new SM caps causing crackles and pops when used for frequency compensation across an anode resistor, even though the voltage was well within their rating.
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Old 8th October 2013, 02:29 AM   #32
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Quote:
Originally Posted by DF96 View Post
Silver mica caps are usually very stable, but I'm sure I read somewhere that they can sometimes have sudden (but small) changes in capacitance. Not likely to affect audio, but could be a problem for their usual use in radio circuits.

I once had problems with some new SM caps causing crackles and pops when used for frequency compensation across an anode resistor, even though the voltage was well within their rating.
Made some really simple line level bass filters to go between DAC and integrated amp. Dialled in value (1500 pf ) with some cheap trimmer caps, and just sent for some nos soviet military SM caps. Think this was a mistake? Ought I instead use
Polystyrene or Pio ? Tried teflon F&F in other applications, didn't care for sound in my system. Ex soviet military teflon is inexpensive if that's your recommendation though. Regards, Mitchell.
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Old 8th October 2013, 09:07 AM   #33
DF96 is offline DF96  England
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I have never used teflon caps. I would always avoid paper in oil because paper caps eventually absorb moisture and that increases capacitance and leakage. PIO was all they had before plastic dielectrics were invented; we don't have to copy them.
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Old 8th October 2013, 07:26 PM   #34
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Quote:
Originally Posted by clarkynoel View Post
so the conclusion is better silver mica than polystrene like Wima MKP or FKP?
In real life it's a matter of cost and physical size.

I use micas where low capacitance values are required, then polystyrene and poly
film/foils, then metallized polyprops, then mylar, then lytics, where I need big values.
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Old 8th October 2013, 09:58 PM   #35
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Quote:
Originally Posted by ticktock View Post
In real life it's a matter of cost and physical size.

I use micas where low capacitance values are required, then polystyrene and poly
film/foils, then metallized polyprops, then mylar, then lytics, where I need big values.
Thanks all. Will try SM caps first then.
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Old 9th October 2013, 07:14 AM   #36
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Where will you use them. In audio!!!

Gajanan Phadte
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