Bally lamp sockets are the weakest

Bally made its own lamp sockets and they are poorer than the bought-in sockets other makers used. Bally backbox sockets are a different design again and often have to be replaced.

Systems

• Electro-mechanical

Related tips

• Dim or flickering lamp sockets
• Change pop bumper lamp sockets from wedge to #47 bayonet
• Lamp types found in EM games
• Playfield lamp fuse blows when one pop bumper fires: lamp socket shorting
• 6 V lamp fuse keeps blowing
• Lamp flickers or is out with a good bulb
• Bally or Williams EM won't light up: game over relay switch

Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)