Mounting an ei core sideways

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You are unlikely to get RF from a transformer, unless your rectifiers generate it. You may get hum or buzz. Magnetic flux will mainly follow the core, but some will leak out. Wires/components which are parallel to the windings are most likely to have a voltage induced in them. For PSU components, which are the only ones which should be near the transformer anyway, induction should not be an issue as direct currents through them are likely to be greater. Distance is more important than orientation.
 
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