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Changing from Electrolytic to Film Cap's
Changing from Electrolytic to Film Cap's
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Old 7th November 2017, 10:39 PM   #1
pjf610 is offline pjf610
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Default Changing from Electrolytic to Film Cap's

Hi All, Question, I read about changing electrolytic caps to film caps what is the reason for this and is their any advantages to it?? Example In my Marantz 2216B there are 50v1uf electro. caps and i was told you can change them to the same value in a film cap, what is the advantage to this ??

Pat
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Old 8th November 2017, 12:59 AM   #2
Old'n'Cranky is offline Old'n'Cranky  Australia
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First one must look at WHERE in the circuit they are.
Case by case basis.
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Old 8th November 2017, 01:54 AM   #3
dotneck335 is offline dotneck335  United States
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Lower ESR. Lower distortion.
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Old 8th November 2017, 04:16 AM   #4
abraxalito is offline abraxalito  United Kingdom
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With a film cap you don't need to worry about having correct polarization.
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Old 8th November 2017, 05:44 AM   #5
georgehifi is offline georgehifi  Australia
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If they are output coupling caps, yes it will be better with good quality plastics, just get ones that are 50v as higher voltage the bigger they are the worse they get, but still better than electro's

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Old 8th November 2017, 09:30 AM   #6
DF96 is offline DF96  England
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Electrolytics are slightly nonlinear - although in most cases this won't matter if the cap has an appropriate value. They are slightly lossy - which the circuit may rely on.

Film caps are more linear, but usually physically much larger so sometimes there can be problems with stray capacitance.

So as others have said, it all depends on exactly how the cap is being used. Sometimes the swap can be an improvement, sometimes it will cause problems and much of the time there will be no change at all.
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