Replacement for the 2N5550 in the high-voltage section
The 80/80A power supply high-voltage section uses a 2N5550. A 2N5551 is a tougher, easier-to-find substitute; both cross to NTE194.
The System 80/80A power supply makes about 60 V and 42 V DC for the displays; keep fingers off the board and connectors with the game on.
Systems
Related tips
- Which System 80 power supply boards are interchangeable
- First power-up, step 3: run the power supply on its own
- Tie the 80/80A power supply logic ground to its heat sink plate
- Original 80/80A power supply design overheats CR7
- Bench-test an 80/80A power supply in the game, part 1
- Bench-test an 80/80A power supply in the game, part 2
- Parts for the 80/80A power supply rebuild
- Test and remove the 80/80A power supply's big transistor
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)