Bally - Stern* Lamp Driver Board with LED support $95 + $5 shipping
Attach included LDB J5 connector to the feature lamp / switched illumination bus, the typically bare wire common to all switched feature lamps. Like at the same player shoots again lamp on the backbox lamp door.
* Note about Stern MPU-200 games. In some cases games using the Stern MPU-200 board may experience a couple lamps flickering. The faster CPU clock in MPU-200 games has some lamps update closer to the zero cross point which exacerbates the flickering issue. Soldering a 470 ohm resistor across any lamp socket that flickers will fix it. There is a balance between wasting energy and pulling enough current to keep SCRs latched. I may decrease the resistor values for lamps that update near the zero cross in future versions. Bally and Stern MPU-100 games are not effected. *
* Note about Stern MPU-200 games. In some cases games using the Stern MPU-200 board may experience a couple lamps flickering. The faster CPU clock in MPU-200 games has some lamps update closer to the zero cross point which exacerbates the flickering issue. Soldering a 470 ohm resistor across any lamp socket that flickers will fix it. There is a balance between wasting energy and pulling enough current to keep SCRs latched. I may decrease the resistor values for lamps that update near the zero cross in future versions. Bally and Stern MPU-100 games are not effected. *