Replacement cap for Wima MKP10 0,047UF - diyAudio
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Old 10th September 2012, 10:14 AM   #1
MiL is offline MiL  Sweden
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Default Replacement cap for Wima MKP10 0,047UF

Hi,

Currently modifying my Copland 305 mark 1 and amongst many component changes looking for a higher quality cap to replace a Wima MKP 10 0,047 uF in the phono section. Other signal caps will be replaced with Mundorf Supreme/Supreme SIO.
There is not much space so bulky caps will not fit however slightly bigger than the Wima will be fine. Hole-hole distance 15 mm.

All suggestions are appreciated/Mike
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Old 10th September 2012, 10:18 AM   #2
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polystyrene if you can find any in that value.
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Old 10th September 2012, 10:29 AM   #3
MiL is offline MiL  Sweden
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Hi and thanks for the suggestion!

I was always of the impression that polypropylene was the no.1 choice. I will look for appropriate polystyrene's.

/Mike
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Old 10th September 2012, 11:38 AM   #4
AndrewT is online now AndrewT  Scotland
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Default for the phono section.

What is the tolerance that this cap needs?
For the RIAA, 1% or 2% are often specified.
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Old 10th September 2012, 12:07 PM   #5
MiL is offline MiL  Sweden
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Hi,

I don't really know but the tolerance is no better than 5% for the Wima.

Anyway I have a hard time finding anything 'better' than the Wima, that will physically fit and not cost like a Mundorf Supreme SGIO.

Best/Mike
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Old 10th September 2012, 12:09 PM   #6
MiL is offline MiL  Sweden
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I have to add that the Wima cap is also specified for AC/DC: 250/400V.

/M
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Old 10th September 2012, 12:11 PM   #7
AndrewT is online now AndrewT  Scotland
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5% tolerance, but did the manufacturer select the caps to a different matching tolerance?

Did they adjust the resistor value/s to match the extremes of a 5% cap tolerance.
Do you know anything about tolerances and computer assisted selection of variable component values?

I don't know much, but I know when alarm bells start to ring.

But just maybe that 47nF is outside the RIAA and has no effect (or little effect) on frequency response.
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Old 10th September 2012, 12:21 PM   #8
MiL is offline MiL  Sweden
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Hi Andrew,

Sorry to say I do not have that information! I am also not that skilled in amplifier constructions. My approach is to put a better quality cap hence it is in the signal chain and all other caps in the signal chain are Mundorf Supreme/SIO. Though this particular Wima cap does not leave much physical room for the types of Mundorfs et al.

/Mike
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Old 10th September 2012, 03:24 PM   #9
AndrewT is online now AndrewT  Scotland
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To make an informed decision on whether the MKP value is important, you must identify what the cap does.

You should not guess and hope.
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