My recall is not that good. I’m guessing the process sequence was:
Use Mechanical pump ( to 10 microns).
Then molecular Seive (to ?? Torr) The decrease in pressure would indicate the oil molecules had decreased?
Then Vac Ion pump to 10x-14 torr
That would make sense. The...
im trying to jog my memory back 30years when I worked with vacuum tubes. I worked with manufacturing of image tubes. I remember the vacuum systems used vac-ion pumps to achieve -12 power torr. I alsoo remember first using a molecular seive for roughing,pumping to 10 microns.
The seive was a...