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Old 10th December 2004, 04:34 AM   #1
mattjk is offline mattjk  United States
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Join Date: Aug 2004
Location: Huntington Beach, Ca
Default Question about adding caps to an amp

I have a B&K ST202+ that I would like to add a pair of filter caps to.

Would it be OK to add 2 different values?

The stock caps are 14.5K and the ones I would like to add are 100K. I tested it tonight and I was very please with the sonic results. Should I completely remove the old caps?

Also, the new caps are 63v, and the rails measure 64v. Am I asking for trouble, or would this be OK?

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Old 10th December 2004, 06:58 AM   #2
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Personally I would use 75v caps here.
Your dc voltage also has some ripple, so peak volts will be higher than the 64v you've just measured. What happens when the mains voltage goes up? Leakage on an electrolytic goes up as voltage rises towards rated volts.
Based on those 3 criteria (& some others) some designers will use even higher rated caps.
The life of the caps is finite and running them at or over their rated voltage may seriously reduce their lifetime.
regards Andrew T.
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Old 11th December 2004, 12:26 AM   #3
anatech is online now anatech  Canada
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Location: Georgetown, On
Hi Matt,
I agree with everything Andrew has mentioned. I would add that much higher capacitance is not good. Why not just replace the old caps with new (not surplus) caps around the same value? Your rectifiers are not rated for the high peak current that the units you have will cause.
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Old 11th December 2004, 05:32 AM   #4
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Join Date: Nov 2002
Location: canada
Try to install many small caps.

I own a HK citation 16 . It have 4 can 10000UF.

I put 1000uf, 470uf, 47 uf in paralel with those big 10000 uf.

WOWWW what a result!!!! hearing is beliving

A friend of mine explain to me that larger can are good for base but they are slower for mid or high.....The smaller cap are much faster and they "fine tune" the filtration.

I know it is PFM but try cost only 10$ for 12 caps for my DIY mod

happy x-mas
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