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Old 14th February 2013, 08:44 PM   #1
krm76 is offline krm76  Spain
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Default Capacitors voltage rating

Hi there,

I want to swap some of the capacitors from my phono stage but I can't seem to find two of them with the same voltage rating. My question is, if I use capacitors but a higher voltage rating will it work fine?

Do capacitors need to work close to their voltage ratings in order to be efficient?

Thank you
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Old 14th February 2013, 09:17 PM   #2
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For electrolytic capacitors... Match the capacitance (the farads) and use voltages that are higher (usually that is the case) than what is called for and you should be safe.

I have mixed small electrolytic capacitors without any visible or audible (but these are not in the audio path) issues. I would believe that the same would apply with polyester film capacitors of different voltage ratings.

What kind of caps are you replacing?
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Old 14th February 2013, 09:36 PM   #3
krm76 is offline krm76  Spain
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I want to swap MKP capacitors 1uF/275V and put film & foil polypropylene 1uF/400V

Last edited by krm76; 14th February 2013 at 09:46 PM.
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Old 14th February 2013, 10:41 PM   #4
DF96 is offline DF96  England
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No problem, provided it will actually fit in place and is not so physcially large that it picks up too much hum.
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Old 15th February 2013, 07:21 AM   #5
krm76 is offline krm76  Spain
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The higher the voltage rating the better?
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Old 15th February 2013, 07:26 AM   #6
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No, the higher the voltage rating the no difference. As long as it high enough, it becomes irrelevant.
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Old 15th February 2013, 07:27 AM   #7
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No.
But your proposed swap is fine, considering the caveats mentioned above.

edit: Sometimes it is relevant.
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Old 15th February 2013, 07:35 AM   #8
krm76 is offline krm76  Spain
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Ok, I'm a bit concerned about the possibility of this capacitors catching hum since they are bigger in size than the actual ones, is there anyway that I could isolate them, if not completly as much as I can?
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Old 15th February 2013, 08:05 AM   #9
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No way to isolate them that I'm aware of. If I'm not mistaken, their layout position is probably most critical here. Best thing is to put a o'scope to it if you have one. Even if you don't, I'd say give it a try and have a listen for new noise. They aren't that much bigger are they?
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Old 15th February 2013, 08:51 AM   #10
krm76 is offline krm76  Spain
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The actual caps are 2cm x 2cm x 1cm

The ones to be replace with they are radial and about (40mm x 30mm) more or less...
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