Momentary and hold relays, and the coil resistance a hold relay needs

Momentary relays pull in briefly; hold relays (feature relays, the Gottlieb hold relay that is on whenever the game is on, the Bally hold relay that latches after the left flipper button) stay in for long periods. To survive that, a hold relay coil has a higher resistance, about 30 to 150 ohms. More ohms runs cooler but pulls less strongly.

Systems

• Electro-mechanical

Related tips

• Relay coil resistance and frame sizes
• Gottlieb relay coil equivalents and resistance
• How a hot hold relay coil destroys itself
• Relay banks and their reset coil
• Bally KKN relay coils and their C-7800 numbers
• Game resets but will not start: adjust hold relay and reset-completed relay latch
• AC and DC relays and coil stops are not interchangeable both ways
• Gottlieb hold relay runs the whole time the game is on

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