AC and DC relays and coil stops are not interchangeable both ways

AC relays and AC coil stops have a copper slug set in the iron core, which keeps the coil holding while the AC waveform passes through zero. An AC relay or stop works in a DC circuit, but a DC one buzzes or fails to hold on AC.

Systems

• Electro-mechanical

Related tips

• Relay banks and their reset coil
• Relay coil resistance and frame sizes
• Gottlieb relay coil equivalents and resistance
• Bally KKN relay coils and their C-7800 numbers
• Momentary and hold relays, and the coil resistance a hold relay needs
• How a hot hold relay coil destroys itself
• Wire an A-16890 relay coil to run on EM AC power
• Gottlieb relay and general-purpose coil windings

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