Lamp driver rail triac. Used on Bally / Williams WPC power/driver boards (5 used per board)
These triacs control the five general-illumination light strands used on the playfield, and in the backbox/cabinet in these games. If you have a strand of GI lights that are not working, you may have a failed triac
TRIAC
Three Quadrant, 600 Volt, 12 Amp
Package: TO220
Williams #5131-12725-00
#BT138-600E
#BTA12-600BW
#BTA12-600BWRG
#BT138E
#BT138-600E,127
