1976 Quasar console

[Electronic M]

Deltas are easy: get purity right, throw up a crosshatch pattern, get static (center) convergence right with three convergence clover magnets + blue lateral on neck, then go after the dynamic (area surrounding the center) convergence controls (on the board with all the pots and adjustable coils on it). Be aware that the dynamic controls rarely are capable of perfection over the whole screen. So once you get it right inward of 1-3" from the edge of the screen, and can't get it better, call it 'done right', and be happy.