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Why a 3 A fuse rather than Gottlieb's 5 A on kicker coils

Gottlieb bulletin 11-P0182 (January 1982) calls for a 5 A slow-blow fuse on these kicker coils. In the guide's test a locked-on coil took over 20 seconds to blow a 5 A fuse and had started to scorch, while a 3 A slow-blow went in about 3 seconds, which is still far longer than a kicker is ever meant to be on.

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Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)