Photo courtesy of Ed Reitan.
Notice the K1 uses an RCA 15GP22 and yoke assembly.
But, there is no electromagnetically produced static-convergence field on this set to operate in conjunction with the three adjustable-position magnets as with a CT-100 configuration.
Here, the three adjustable-position convergence magnets hinge up from the angle shown to an angle that is perfectly vertical into the tube neck. It appears they rotate on threaded screws into and out from the CRT neck. But again, without the purity coil and its potentiometer.
If you have information that would be helpful adjusting this configuration for static convergence or any historical data about this configuration, please email your thoughts to