The author has a separate page for rebuilding the large electrolytic capacitors that is really interesting: https://retrocmp.de/northstar-hrz/ns-hrz_p08_capaci

The author has a separate page for rebuilding the large electrolytic capacitors that is really interesting: https://retrocmp.de/northstar-hrz/ns-hrz_p08_capacitors.htm https://retrocmp.de/northstar-hrz/ns-hrz_p08_capacitors.htm > Why Do Capacitors Need to be Reformed? >Whether capacitors are stored as a component or installed as part of an equipment assembly, the result is the same. Electrolytic capacitors that remain unpowered for longer than 6 to 18 months can experience degradation of their aluminum oxide dielectric insulation. Power applied at the capacitor’s rated capacity can exploit any weakness in this insulation. This will allow the voltage to punch through to a short circuit condition. >The resulting short circuit of a capacitor results in physical and electrical damage to the capacitor. It also leads to catastrophic failure of the equipment. A severe failure of a capacitor can also cause collateral damage to surrounding equipment. For example, built up pressure inside a failed capacitor can cause physical damage in the surrounding area from capacitor material being expelled. Or, combustion damage to fragile circuitry and other components is possible. This type of failure can possibly pose a risk to personnel in the area in the event of a failure.