Converting the lower playfield #313 lamps to #44/#55

Steps

• The nine lower playfield lights on Haunted House and Black Hole are 24 V #313 bulbs fed from the solenoid supply through the "L" relay under the lower playfield.
• Remove the orange-slate-slate (24 V) wire from the L relay switch stack, tape it and tie it out of the way.
• Jumper that switch lug to the 6 V DC controlled-lamp supply (black-slate-slate wire), found at any CPU-controlled lamp.
• Replace the nine #313 bulbs with #44 or #55. They are nearly as bright.
• Do not use the 6.3 V AC general illumination line; it leaves the #44s too dim.

Systems

• Gottlieb System 80

Games

• Black Hole
• Haunted House

Related tips

• Black Hole playfield-mounted transistors Q1 to Q5
• Haunted House playfield-mounted transistors Q1 to Q3
• Up-kicker fires by itself when the flippers are pressed
• Haunted House up-kicker too weak to reach the main playfield
• Single-PROM System 80 games and their game numbers
• Black Hole and Haunted House third relay ("U")
• Haunted House has six switch-fired kickers that need fuses
• Where the arc capacitor goes on the Haunted House up-kicker

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)