10 pcs Tip107 Texas Instruments Bally Home Version Pinball Machine Circuit Board. This is the Most Common Failure Of Non-Working Solenoid Coils In Bally Home Version Pinball Machines, and Also Other Coin Op Machines. Then Check Your Coil Diode, Wiring, Connectors, Actual Coil, Then Pre-Driver Chip. I Guess It’s Important To Note That These Are The Replacements For What Is Probably Labeled On These Transistors As SE9400. That Was Pretty Common Back Then.