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Athearn Engine Trobble
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If you are using D.C., is your power source "straight" D.C. or is it the throttle type that utilizes pulses of power, like the "old "pulse power" on some MRC packs of days gone by. Such will cause a hum in the engine, especially at low speed. Try connecting the engine to a 9 v. battery (via the wheels) and see if the hum ceases.
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