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Polymer caps (SEPC)  Vs Silmic II for coupling
Polymer caps (SEPC)  Vs Silmic II for coupling
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Old 16th October 2018, 05:20 PM   #1
legarem is offline legarem  Canada
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Default Polymer caps (SEPC) Vs Silmic II for coupling

Hi

I have to change the coupling caps in a preamp. There's not too much place to use film caps so I would like to upgrade the tantalums and electrolytic caps in the signal. Silmic II seems to be one of the best electrolytic caps to use in the signal path. Someone mentionned me that organic polymer (SEPC) caps should be better. I never tried them so what do you think about them for signal coupling ?

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Old 16th October 2018, 06:40 PM   #2
pdul is offline pdul  Denmark
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Organic polymer caps have a higher leak current. Just have that in mind when experimenting
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Old 16th October 2018, 07:16 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by legarem View Post
I have to change the coupling caps in a preamp.
Tube or transistor? What value and voltage?
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Old 16th October 2018, 08:44 PM   #4
analog_sa is offline analog_sa  Europe
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Polymer caps (SEPC)  Vs Silmic II for coupling
Tubes with polymer caps? Perhaps in the heater circuit, but not likely as coupling.
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Old 16th October 2018, 09:24 PM   #5
phase is offline phase  United States
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I used to use polymer caps for digital decoupling, where they are not bad, now just main filtering for digital circuits.
They arenít really what youíd want for analog power let alone in the signal path.

Iíd look at the nichicon muse, with a small film bypass.
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Old 17th October 2018, 05:04 AM   #6
spaceistheplace is offline spaceistheplace
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Polymer caps (SEPC)  Vs Silmic II for coupling
Default Polymer caps (SEPC) Vs Silmic II for coupling

For coupling or for bypass?

Knowing the circuit in question would likely yield you better answers.

Iíve used polymers in heater supplies for quite a while.

I havenít seen much of a credible / technical answer for why they wouldnít be superior to a regular Electrolytic across the board.

To my knowledge none of the more involved studies of caps utilized polymers, just regular electrolytics and bipolars.
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Last edited by spaceistheplace; 17th October 2018 at 05:09 AM.
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