Identifying the leads of a bottom-panel bridge rectifier
The lead set at a different angle from the other three is DC positive; the lead diagonally opposite is DC negative; the other two are the AC inputs. The two DC leads also run to the filter capacitor's positive and negative terminals.
Systems
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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)