Quote:
Originally Posted by RitchieMars
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...
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Here are a couple of pix of a permanent magnet focus assembly (mounted between the yoke and the ion trap) in my 1953 Philco... it would take a fair amount of mechanical modification to support such an assembly in your set, but it might be worth a try if you can't find the correct CRT. The focus adjust is the little brass knob on the flex shaft, shown on the second picture. The little lever, with the wing-nut lock at the top of the assembly is the position adjuster.
The Philco uses a 17YP4, which also has a cylindrical face.
jr