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Jan Rowland

This is a side section to indicate how the coil insulation separates the wire from the core laminations.

F should be about 99% of the sum of 2W and CW. If it is 100%, it may have to "squeeze in", doing damage.

After winding coil, insulating and Formvar-soak and drying, CF should be about 101% of T. As far as the transformer assembly itself goes, there is no limit for H. However the completed transformer must obviously fit where it is to be mounted!