Replacement pre-Xenon rectifier boards exist

If a 1977-1980 rectifier board is past fixing, new replacement boards are made, including a version for Kiss, Space Invaders and Future Spa.

Systems

• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200

Related tips

• Checking the pre-Xenon supply with the game unplugged from it
• How the pre-Xenon power supply works
• How the -49 rectifier board differs from the -18
• What each rectifier on the board feeds
• Rectifier board test points
• Rectifier board test point voltages
• The three Bally rectifier boards
• Upgrading the AS2518-18 / -49 rectifier board

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)