EM transformer high and normal tap positions by maker

Most EM transformers have four labelled lugs on top. Gottlieb: left lug is High, second from left is Normal. Bally: same layout, numbered, with 2 for High and 4 for Normal. Williams: reversed; right lug is High (marked High Tap), second from right is Normal (marked 24 Volts). Chicago Coin games have a two-position plug on the cabinet floor, marked 30 V (normal) and 33 V (high), or Playfield Action Normal and Stronger.

Unplug before touching the transformer; its input side is at line voltage.

Systems

• Electro-mechanical

Related tips

• High tap: a little more coil power from the transformer
• Test an EM transformer
• What the EM transformer supplies
• Coil voltages used by EM makers
• EM transformers almost never fail

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)