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Filter capacitors for SX-1010 and tolerance

silence012

silence012

New Member
Hi all,

I am searching for filter capacitors for my SX-1010.

The usual recommended replacement was Nichicon 18000uF, 75V (https://www.digikey.de/en/products/detail/chemi-con/E36D750MLN183TC79M/2095945), but it is long time out of stock.

One option that I found is these 18000uF 63V from Nichicon as well: https://www.digikey.at/en/products/detail/chemi-con/ESMH630VRT183MB50U/13247255
They are pretty cheap, but smaller size, so I will need to do something about it.

And more expensive option is https://www.digikey.at/en/products/detail/cornell-dubilier-knowles/DCMC203U100BC2B/2538263

The more expensive option (Cornell Dubilier Knowles) is 20000uF, and it has a tolerance of -20 to +75%. I guess that small increase in value (+2000uF) will not do much bad job, but if you put 75% tolerance on top of it, this can be significant difference. I am afraid that it can burn my high current rectifier with huge in-rush current.

However:
- @markthefixer mentioned in this post that original capacitors have tolerance up to +80%
- The "original" replacement from Nichicon also has tolerance -10% to +50% (one that is not in stock anymore)

I would appreciate any information and suggestion.

Cheers,
Branko
 
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kirbjas said:
From my experience new caps don't tend to be much over their capacitance rating.
Click to expand...
new caps, ON AVERAGE, are being manufactured 10-15% BELOW rated value. that's the main reason for going up a size

it's just them squeezing extra pennies out of each piece.

kirbjas said:
I am planning to use these myself https://www.mouser.ca/en/ProductDetail/80-ALS30A223KE063
Click to expand...

those are exactly what i used in my sx1010. one thing to note, they do not include screws. i THINK they are m5 x 0.8 .....
 
Use 22000 uf. They'll work fine. They'll probably test around 18000-20000 uf.

The original "+50%" or "+80%" thing is misleading; these caps would not test significantly higher than their marked ratings back then.
 
Kemet seem nice. Often you can find them with a very high life rating, 18,000 hours etc.

I think all new caps I test come in about 85% of UF rating if they are rated +- 20%. However if a buy a cap that is rated -10% +30% they test right around the uf rating or slightly higher. I would guess the above mentioned -20% +75% rated caps would come in at least their actual uf rating. I've never tested a new cap with that wide of a tolerance.
 
I just used a set of screw-in 22K uF/63 V Kemets, think they were 51mm diameter and 80mm tall. I had to shim them a bit, just used some tape. Both were right at 20K uF and outstanding ESR!
 
I ordered the from a different source and hopefully they will arrive in few days. Thanks all for the suggestions.
 
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