Atari Space Duel Arcade

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I'd go through the game sooner than later and do what's recommended in the FAQs to make the thing reliable and more importantly, less likely to self destruct.

Space Duel's normally use a Wells Gardner WG6100. This beast will kill its own power supply if the deflection amps or HV cage goes south, making for even more repairs.

There's also merit to doing recommended upgrades to the AR-II, also known as the power supply regulator and audio amplifier board, as these will lead to serious destruction of the logic and even the monitor if it goes south. It's simple work that includes re-capping amongst other things, which can best be described as an ounce of prevention=ton of cure.