Spare transistors for System 1 boards

Driver board: MPS-U45, MPS-A13, 2N3055 and TIP102 (in place of 2N6043/SE9300). Under the playfield: 2N5879, 2N5880, 2N5883 or 2N5884. CPU board: MPS-A70. Power supply pass transistor: 2N6057 or 2N6059 (original PMD10K40).

Systems

• Gottlieb System 1

Related tips

• Driver transistors Q1-Q4: relays and spare outputs
• Which driver transistor fires which coil
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• Testing MPS-A13 and MPS-U45 driver transistors
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• Testing the 2N6043 coil drivers

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)