To replace any cap, know more about the cap you are replacing... the methods of both manufacturing and usage have changed. Also, many new types are available now.
As I don't have the time or space to discuss the above limitations, I will give some advice instead. First, ALWAYS buy your caps from a REPUTABLE DEALER, not the local parts store. Second, ALWAYS use replacements with a higher voltage rating to prevent problems. For example, if a filter cap is rated at 450 volts DC, use a 630 volt cap. If you don't know beans about caps, DON'T TOUCH YOUR PRODUCT and find an expert. The types of cap DO make a difference!
As I don't have the time or space to discuss the above limitations, I will give some advice instead. First, ALWAYS buy your caps from a REPUTABLE DEALER, not the local parts store. Second, ALWAYS use replacements with a higher voltage rating to prevent problems. For example, if a filter cap is rated at 450 volts DC, use a 630 volt cap. If you don't know beans about caps, DON'T TOUCH YOUR PRODUCT and find an expert. The types of cap DO make a difference!