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Right, I was thinking that. I wonder if this worked like it does on an electrostatic speaker where the magnetic field is created by current flowing through a coil, which would means the coil would have to be tapped into a circuit somewhere. Obviously, a permanent magnet would be much easier. I'll look into this a bit...
I'm still unsure about this type of tube and I wish I could find some specifics on it. I'd hate to pass up a NOS tube. In my opinion, changing to a magnetic focus would be an improvement over the electrostatic if it were possible. With the electrostatic type, I understand that the focus degrades over the life of the tube.
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