Here are the MOST important factors:
0- Do NOT skimp on price, buy the BEST if you want to use them forever (relative).
1- The higher the voltage the rating, the safer the bet. This also increases the ripple
current rating which makes it more resilient. This is VERY important for higher
power amps. It also protects for AC mains spikes which may occur and endanger
exceeding the voltage rating, even for a very short time, if you buy them right at the
limit voltage.
2 - Temperature, temperature & temperature. The higher the rating (105 degrees C) the
better the capacitor will be constructed and the longer it will last. Temperature is the greatest enemy of an electrolytic capacitor and higher ratings are much better.
Check these out, even tho they are obsolete, they can still be bought here & there. They last 20,000 hrs at 105 degrees C... almost unbeatable.
https://www.digikey.com/en/products/filter/aluminum-electrolytic-capacitors/58?s=N4IgjCBcoOwEwFYqgMZ...
0- Do NOT skimp on price, buy the BEST if you want to use them forever (relative).
1- The higher the voltage the rating, the safer the bet. This also increases the ripple
current rating which makes it more resilient. This is VERY important for higher
power amps. It also protects for AC mains spikes which may occur and endanger
exceeding the voltage rating, even for a very short time, if you buy them right at the
limit voltage.
2 - Temperature, temperature & temperature. The higher the rating (105 degrees C) the
better the capacitor will be constructed and the longer it will last. Temperature is the greatest enemy of an electrolytic capacitor and higher ratings are much better.
Check these out, even tho they are obsolete, they can still be bought here & there. They last 20,000 hrs at 105 degrees C... almost unbeatable.
https://www.digikey.com/en/products/filter/aluminum-electrolytic-capacitors/58?s=N4IgjCBcoOwEwFYqgMZ...