What makes a coil stronger or weaker

Coil strength depends on supply voltage, number of turns and wire gauge. Higher voltage, fewer turns and thicker wire all lower resistance and add strength, but only down to about 2 ohms; below that the coil acts as a dead short, weakens its field and blows fuses.

Systems

• Electro-mechanical

Related tips

• Coil stops by maker
• Coil sleeves and plungers to keep
• Typical EM coil resistances
• EM coil voltage by maker
• Bally C0- coil numbers and their replacements
• Normal EM coil resistance range
• Coil frame sizes by maker
• Keep a list of known coil resistances

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