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Not being in this expertise I'm not privy to the history of experimental designs. It occurred to me that one could make an electromagnetic pickup using soft steel poles and decouple the AC with a capacitor. I was picturing six individual electromagnets with half in one phase and half in the other for hum cancelling. A module of six mini pots could be placed in the control cavity to adjust individual string output if desired via the power to the individual coils. My first consideration of a flaw in this design is that electromagnets may consume too much power to make it practical. I'm just thinking out loud.
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Chuck, see my comment re. a 1930s lap steel that used the pickup coil as an electromagnet in a "charge the strings" phase. It wasn't used as a permanently "on" electromagnet, but rather as a quick magnetizer of the strings. Then the pickup became an air core coil.
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