Strange focus problem

[jpdylon]

The panasonic I got awhile back has an odd focus problem.

The edges of the picture are sharp, but the center is slightly blured. I can'f find any labeled focus control on this set or any jumpers that control focus voltage.

The problem does not vary with brightness or picture and there's no blooming , so I don't think its an HV problem.

Anybody gota sams or any idea where to start. I've already checked the focus rectifier diode, which is ok.

Could this be a focus control? Its not the efficency coil, that is behind the HV cage...