Heating or maintaining the temperature of a cathode ray tube that is waiting to undergo frit knocking has been discovered to substantially reduce the dangerous and harmful tendency of electrical arcing between the high-voltage probe and grounded band used in the frit knocking process. Any means or method of heating such a cathode ray tube including, but not limited to, placing the cathode ray tube in an oven or heating unit, or in a heated room or chamber produces beneficial results. Placing the cathode ray tube in an insulated envelope or blanket can also help. In particular, one or more heat packs that are heated in an oven and then brought into thermal contact with the cathode ray tube can be used to heat or maintain the temperature of the cathode ray tube.