Hi, I have to admit I feel a bit stupid asking this question as it's something I should really know, but it's one of those things where I keep asking myself should I or shouldn't I.
So during this lockdown, to keep myself busy, I bought a couple of NAD 3020E amplifiers to recap and give a general spruce up.
The question I have is, There are a few 1uf 50v caps fitted, But the replacement ones I have of the same voltage are way smaller in physical size, as are many others, I have some 1uf 160v Caps which are more or less the same size as the old ones so the question really is from an aesthetic point of view, do I fit the 160v Rated ones, or the 50v original voltage.
Other caps for example, I've fitted say a 35v rated Cap instead of the original voltage of 25v just to try and keep the pin pitch the same.
My feeling is that providing the value in uf is the same, the Higher Voltage shouldn't matter, unless there is something I'm totally unaware of in fitting a cap that is 110v over the normal rated voltage that could possibly introduce problems.
Thanks In Advance Guys.
So during this lockdown, to keep myself busy, I bought a couple of NAD 3020E amplifiers to recap and give a general spruce up.
The question I have is, There are a few 1uf 50v caps fitted, But the replacement ones I have of the same voltage are way smaller in physical size, as are many others, I have some 1uf 160v Caps which are more or less the same size as the old ones so the question really is from an aesthetic point of view, do I fit the 160v Rated ones, or the 50v original voltage.
Other caps for example, I've fitted say a 35v rated Cap instead of the original voltage of 25v just to try and keep the pin pitch the same.
My feeling is that providing the value in uf is the same, the Higher Voltage shouldn't matter, unless there is something I'm totally unaware of in fitting a cap that is 110v over the normal rated voltage that could possibly introduce problems.
Thanks In Advance Guys.
Check the datasheets and compare the two capacitors, they may differ in specifications where it matters. Don't specify capacitors on the basis of aesthetics.
Thanks for the reply, I'll see if I can find the Datasheets of the old Capacitors which all appear to be "Elite", I've been fitting Nichicon capacitors throughout.
Generally the higher the voltage rating the larger the capacitor size, if the dimensions are the same the manufacturer will have to sacrifice a part of the specification if the capacitors are of the same value but have different voltage ratings.
Check esr, ripple current, lifespan (hours), temperature rating, leakage, these won't be the same for two capacitors of the same value but with different voltage ratings.
Check esr, ripple current, lifespan (hours), temperature rating, leakage, these won't be the same for two capacitors of the same value but with different voltage ratings.
Hmm, Proving difficult to find information on the original caps "CLP" Series?
Might just fit the Correct Value and Voltage Nichicon caps even though they are tiny compared to the originals.
You could compare the datasheet values for the lower and higher voltage new capacitors, then at least you know whether there is any technical disadvantage to using the higher voltage ones.
By the way, are there any LM317 voltage regulators in the circuit? I know from experience that those need lossy output decoupling capacitors for stability, so crap capacitors are preferred over good ones at the output of an LM317.
By the way, are there any LM317 voltage regulators in the circuit? I know from experience that those need lossy output decoupling capacitors for stability, so crap capacitors are preferred over good ones at the output of an LM317.
Or just add series resistor before the decoupling cap so you can use quality ones that will last better? Actual resistance works as well as effective resistance!
For a given capacitance value, higher voltage-rated caps usually have a lower tan σ, which relates to a lower ESR.
I can't seem to find any info on the original Elite capacitors, so difficult to make any comparison, The Amp does not use LM317's for regulation.
I know you have no data on the original capacitors, that's why I suggested comparing the new capacitors with each other rather than with the originals.
I don't think the original capacitors were particularly special in any way. I've successfully replaced the ones in my NADs with a mixture of Nichicon and Wurth.
Generally the newer caps are smaller for the same capacity and voltage rating - i.e. the technology for the voltage rating and capacity has improved to allow smaller packages for the same thing.
I personally don't move up more than 1 voltage rating to get a convenient pin pitch - 63v instead of 50v, 16v instead of 10v etc. Never use a lower rating.
The originals are mostly ~85c rated, so 105c would give some longevity.
Generally the newer caps are smaller for the same capacity and voltage rating - i.e. the technology for the voltage rating and capacity has improved to allow smaller packages for the same thing.
I personally don't move up more than 1 voltage rating to get a convenient pin pitch - 63v instead of 50v, 16v instead of 10v etc. Never use a lower rating.
The originals are mostly ~85c rated, so 105c would give some longevity.
Ah, Sorry, I misunderstood your last post, Unfortunately My Capacitance Meter is an "El' Cheapo" and doesn't measure ESR, it's ok for just checking each cap as I replace them.
Thanks for the reply, That's Basically what I have done, Some of the 25v Caps are replaced with 35v and so on, The Original 1uf 50v I have replaced with the same value and voltage, they are quite a bit smaller, but with a bit of fiddling I formed the leg's with so they fit quite nicely, All replacement caps are Nichicon and 105 °C Rated.