Curtis Mathes C20/ctc15/16 clone Focus magnet/blue lateral???

[Electronic M]

Wrong on most counts...The blue lateral magnet moves the blue beam side to side to converge it. The blue moves in two axes X (adjustment on top convergence clover petal), and Y (blue lateral).

There were no round screen color CRTs with magnetic focus. Focus is electrostatc and takes 2-5KV from the flyback system.

Some blue lateral magnets were grounded to prevent capacitive charge buildup that could bite a tech adjusting it.

Some later lateral magnets were integrated with the purity ring assembly (I can only recall seeing it on rectangular CRTs though).

Good luck on your search.