I was reading about field coil speaker elements, where the "magnet" for the speaker is created by an active electrical supply rather than by using fixed magnets.
Well, that got me to thinking, could you do the same thing for a phono cartridge?
I know you'd need a couple extra runs of wire through the tonearm, but like with a strain gauge, by eliminating a fixed magnet and its mass, you might gain in the process.
I can't find anything about whether or not this have ever been attempted.
Anybody know enough about this sort of thing?