Re: Opposed Twin Coil swap….TG and others…

[Phil Budne]

As I understand it the coating is put on the laminations to avoid what are called "hysteresis" losses. Essentially to cut down on " eddy " currents within the metal of the coil core, dividing into laminations also helps in this regard, as opposed to having the core of solid metal.
The above losses if not addressed tend to heat the core. Of course, we all know of older coils and coil designs that do have solid cores.
It seems that magneto coils are small enough that this may not be much of an issue, it certainly is an issue on transformers that handle a large amount of power.

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