Big Blue Capacitor used on Atari power supplies. These capactiors are locatd on the power supply block on Atari transformers, and have screw down terminals. If you game does not have a new one and has strange problems with power or resets then many times replacing this will fix it. It is always good to replace the old capacitor with a new one as preventive maintenance. These are 27000uf at 25-30v.