Mission Cyrus 2 balance control elimination

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#21
Thanks,


I did the same as you did, lifted the 2 "bridges" to disconnect the power to the phono stage section.
I replaced all the 'lytics with Elna silmic II.
Is the Panasonic FC more suitable than the Elna Silmic?

I also replaced the Bipolar caps to the Nichicon MUSE bipolar but as you and jean-paul suggested, I will replace the 1uF and 2.2uF Bipolars to film capacitors (cannot find 470uF Bipolar that will fit).
 
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#22
jean-paul said:
Hi, Wima MKS2 in 5 mm are the caps for 1 and 2.2 µF. I would choose Nichicon MUSE bipolar for the 470 uF. When one can replace electrolytic caps for film one should do it. The MKS2 perform better than the average electrolytic cap. Please make sure to replace the 22 and 100 µF caps for Panasonic FC or the like. You can up the voltage rating a bit to have the same physical size as the old ones.
Click to expand...


Thank you.
in case I cannot find the Wima MKS2 caps, what specs do I need to look for in a film capacitor that will be suitable for this purpose?
 
#23
Mark Whitney said:
Other resistor values can be chosen and I may have used two 10K resistors in the cables.

On my amp some of the capacitors are starting to bulge and disconnecting power is an easy fix as I don't use the phono input.
Click to expand...

From 4k7 to 10k is a step 🙂 Anyway custom cables are a solution often forgotten and then they find their way in other installations. It is preferable to specifically alter the device that has an issue instead of making standard cables custom.

Please ALWAYS replace bulging caps. You don't save anything by keeping them and costs for a few caps are simply too low to justify non action, you will learn this when they will leak their electrolyte and destroy the PCB. Stuff that is defective must be replaced to prevent more damage. Or just take them out.

Sandm0n said:
(in case I cannot find the Wima MKS2 caps) (cannot find 470uF Bipolar that will fit).
Click to expand...

@Sandm0n: if you can't find the most used standard caps well there is nothing else besides just a few brands that produce 5 mm pitched caps. You could just set the goal on Wima MKS2 in 5 mm and keep searching and find them. If they have disappeared from this world all of a sudden I can help as I always have these in stock. The minimum type polyester film in 5 mm with the right value/ratings/size. Don't choose to be lazy and fit larger sized caps as the device will then be degraded to below amateur level.

You can find the 470 µF 25V in bipolar MUSE as Mark showed us in post #20. I think you need to search better and spend 5 minutes more. When a part exists and one needs it it is very effective to search that particular part instead of asking what other part can be fit as the answer is none really. Probably the other part is also hard to get. Not many produce audio bipolar caps that are outstanding like these. Accepting anything else than the set goal will not lead to optimal performance. If you need sugar in your coffee and the sugar is gone at supermarket A you will not use salt instead do you? No you will search the sugar in supermarket B.

Given the fact that you have trouble finding both caps I suggest shopping at the known distributors (and not take the risk buying on Ebay).
 
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#24
I've already replaced all the Bipolar capacitors with new nichicon MUSE BP.
For some reason RS don't have the Wima MKS2 2.2uF in stock, only the 1uF, but they do have KEMET capacitors with 2.2uF value, one is PET and the other is Metallized Polyester cap, which one is better for that purpose?


I just would like to know if there is any real difference, that someone can hear between the Wima MKS2 and other capacitors from the same kind?


Thanks
 
#25
You found and ordered and got MUSE 470 uF 25V bipolar delivered in less than an hour? Impressive 🙂

Seeing the uncertainty and the dependance on others opinions I suggest not listening to others and try out PET or whatever film cap type yourself as there is only one way to find out if it makes a difference to you. Make sure they are 5 mm, right value and ratings.

The Wima MKS2 in 2.2 µF don't seem to be rare at all:

Let Me Google That
 
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#29
If the transformer and diodes can take the higher surge current, why not?

If the original filter caps are still there changing them for modern low ESR types often has impact. New ones will be physically smaller as well so higher value and higher voltage rating are necessary if one wants it to fit.

Some don’t like the sound after new filter caps have been installed as one grows accustomed to the worn out caps (if they are worn out). It is IMO a good habit recapping old devices but not everyone has the same opinion. One will think the same after the first device that blows the filter caps when plugged in however.
 
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#30
Thank you, I appreciate your help and advice.

jean-paul said:
If the transformer and diodes can take the higher surge current, why not?
Click to expand...


How can I know?
What is the "safe" zone?



The only reason I'm considering replacing the smoothing caps is this small dent, as far as I can see these caps has been replaced before (I'm not the first owner).
I do have a new spare of Cornell dublier SLPX 10,000uF 50V caps but was wondering if a higher capacitance will give any real improvment over the 10,000uF caps?


Thanks again.
 
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#31
10,000 µF = 10,000 µF. You probably mean that the new ones are 15,000 µF. It is you who must check what the value and voltage rating of the old ones is en if the new one is the same size and same pitch etc. It is not my task finding everything for you. Please make a comparison on size, voltage rating and value.

* Check data sheets of the soldered diodes or bridge.
 
#32
Just checked the datasheet but Cornell Dubilier SLPX are just value capacitors ("most cost-effective choice" etc.). Nothing special about these. I would advise to choose something higher specced.

A nice opportunity to use a higher voltage rated, higher value type with the same physical properties as the old ones, now with added challenge of lower ESR, high current capability etc. Since it are only 2 caps and it is for a beloved device one better uses best price/quality ratio types or ... quite brutal... the best ones one can find.
 
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#33
jean-paul said:
I would advise to choose something higher specced.

Since it are only 2 caps and it is for a beloved device one better uses best price/quality ratio types or ... quite brutal... the best ones one can find.
Click to expand...


Any suggestions or guidelines? what do I need to look for when searching a better quality capacitors beside voltage rating, higher capacitance, low ESR?


Thanks
 
#37
a. The Vishay (former BC components) series 158 in 12000 µF 50V in size 35 x 45 seem good candidates. Low ESR combined with 105 degrees and ultra long life. You will lose slightly in ESR values but get ultra long life and high temp capability in return. ESR of those probably is also way lower than the original caps (you could check that just like measuring the actual voltage now being on the caps).

b. Series 158 10,000 µF 63V have exactly same size and same value as the old ones but higher voltage ratings. If the actual voltage is too close to 50V I would choose these.

c. The Kendeil 15,000 µF 50V are same size and 105 degrees and have lowest ESR of all if I am not mistaking. They have the best cards I would say.

Step 1: measure actual voltage and decide whether to use 50V or 63V. Then step 2: check ESR of the old caps. Step 3: check diodes for ratings... It will not break the bank to replace those for higher rated ones if you want higher capacity caps. Considering the age and the number of power on events it might be wise to replace them anyway.

Tip: with any new large value filter cap type it is OK to charge it with a bench PSU/adapter/laptop SMPS, a switch and a 100 Ohm series resistor at 10 to 25V or so. Leave them charging/powered on for let's say an hour and then discharge them to 0V with the same resistor. Never discharge by shorting!!!
 
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