Wow, I'm surprised I did not already see the answer to the initial questions. So here we go...
U.S. power is at 60 Hz, and will definitely affect your motor speed compared to 50 Hz.
As noted, many projectors, including Bell & Howell, have two pulleys for speed change. Sometimes they offer a choice between 18 and 24 fps (when connected to the correct power source for the motor installed), and others -- such as the military spec Bell & Howell projectors, and every Elmo or Eiki projector I've ever owned, offer two pulleys that will run the projector at 24 fps on either 50 Hz or 60 Hz power.
If I shift the belt on my Elmo to the 50 hZ pulley and use it here in the USA, it will run FASTER than normal, not slower.
U.S. power is at 60 Hz, and will definitely affect your motor speed compared to 50 Hz.
As noted, many projectors, including Bell & Howell, have two pulleys for speed change. Sometimes they offer a choice between 18 and 24 fps (when connected to the correct power source for the motor installed), and others -- such as the military spec Bell & Howell projectors, and every Elmo or Eiki projector I've ever owned, offer two pulleys that will run the projector at 24 fps on either 50 Hz or 60 Hz power.
If I shift the belt on my Elmo to the 50 hZ pulley and use it here in the USA, it will run FASTER than normal, not slower.
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