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Old 28th March 2012, 02:22 PM   #1
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Default mkt capacitor vs mylar capacitor

Gooday all,
What would be the advantage to use a MKT capacitor over a Mylar capacitor on the signal input stage of an amplifier ? Which is the better ?

Regards
Jan
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Old 28th March 2012, 08:18 PM   #2
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MKT = metalized polyester
mylar = polyester film

So the basic dielectric is the same for both. Metalized film caps have a higher capacity density and are a touch less linear. Either should be fine as an input coupling cap. If you need extremely good linearity, the next big step up is polypropylene - at the cost of a physically bigger part, obviously.

Keep in mind that capacitor nonlinearity only matters when a significant part of the signal voltage actually drops over it. Hence the common practice of oversizing electrolytics by a factor of 10. If you do want a highpass without incurring a distortion penalty, you have to go film.
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Old 5th July 2016, 02:25 PM   #3
maouna is offline maouna  Greece
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between a green polyester mylar film capacitor and a polyester film box type capacitor,which one do you suggest to use in a tone control?
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Old 5th July 2016, 03:09 PM   #4
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It doesn't matter what you use in an amplifier, in this non critical application it's all the same.
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Old 5th July 2016, 04:15 PM   #5
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better to get polystyrene if possible and if you can find the right value or parallel to get the value.
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