Replacement cap for Wima MKP10 0,047UF

[MiL]

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

 

[sq225917]

polystyrene if you can find any in that value.

 

[MiL]

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

 

[AndrewT]

for the phono section.

What is the tolerance that this cap needs?
For the RIAA, 1% or 2% are often specified.

 

[MiL]

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

 

[MiL]

I have to add that the Wima cap is also specified for AC/DC: 250/400V.

/M

 

[AndrewT]

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.

 

[MiL]

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

 

[AndrewT]

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.