crt - cathode ray tube,television tube
yoke - scan coils,deflection coil
chassis - monitor control circuit board
degauss - demagnetising circuit of the chassis
ht - high tension,high voltage power to the tube
flyback transformer - lopt,high voltage transformer
dual focus - A monitor that has two focus adjustments: one for horizontal, and one for vertical. The neck connector has two focus pins, and a special flyback is needed with two focus pots and wires.