When replacing regular diodes, use 1N4007 diodes. They cost is same as
lower rated diodes, but have a higher rating and you can freely substitute a
higher rated diode for a lower rated one such as a 1N4001. The higher
rating only means that it will take a higher voltage before it breaks
down.
You can go as low as 1N4004 for most applications on a pinball machine.
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