Coil voltages used by EM makers
Most EM coils run on 24 to 50 V AC. Williams used 50 V AC for coils until Friendship 7 (1962), then dropped to 24 V AC for safety; 1970s Bally games used 50 V. Gottlieb also fitted some 120 V coils, mainly the large relay-bank reset coils and some start relays.
50 V coil circuits can give a dangerous shock, and 120 V coils on Gottlieb reset banks are at line voltage.
Systems
Related tips
- EM coil voltage by maker
- Coil stops by maker
- Bridge rectifier for 1970s Bally and Williams DC coils
- High tap: a little more coil power from the transformer
- EM transformer high and normal tap positions by maker
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)