Computor grade capacitors are Verry Good, Old ones May be able to be reformed by Slowly Charging them via a large resistor in series. However Newer Capacitors have Improved Technology and Thus may be Better Sonicly. Those Old Soup Cans As i call Them may not sound as good as like the New Solid Electrolytisc in the Mids and High's. What those OLD SOUP CANS Were Good at is Bass and Control. Thay have a High Ripple Current rating and LowESR(Equiv. Series resistence) But have alot of inductance as well as Having Larger Dialectric Absorbtion than Newer Fomulations.