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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.
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