A.)Open main valve and evacuate unit to 0 mm (Torr). Close main valve.
B.)Backfill with 2mm (Torr) of air.
C.)Switch on bombarder and increase to 250 mA. Hold at this setting while maintaining pressure between 2 and 3 mm (Torr) with main valve.
D.)When the unit is at 150C/310F, increase current to 300 mA.
E.)Maintain pressure between 2 and 3 mm (Torr) with main valve.
F.)At 200C/392F, reduce pressure to 1.5 Torr and increase to 350/375 mA.
G.)When the electrodes are completely red and the glass has reached 230C/450F, switch off the bombarder and open the main valve.
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.