A.)Open main valve and evacuate unit to 0 mm (Torr). Close main valve.
B.)Backfill with 3 mm (Torr) of air.
C.)Switch on bombarder and increase to 250mA. Hold at this setting while maintaining pressure between 3 and 4 mm (Torr) with main valve.
D.)When the unit is at 150C/310F, increase current to 350mA.
E.)Maintain pressure between 3 and 4 mm (Torr) with main valve.
F.)When the glass reaches 200C/392F, reduce pressure to 1.5 Torr and increase to 400mA.
G.)When the electrodes are completely red and the glass has reached 230C/450F, open the main valve for a few seconds and then switch off the bombarder.
H.)With the main valve open, allow the tube to cool to around 50C/125F with a vacuum gauge reading less than 5 microns.
I.)Fill the unit with gas.