Just in case anyone reading this has money to spend, there are some very nice diaphragm or membrane pumps made for backing up the exhaust of more powerful turbomolecular pumps in high-vacuum and ultra-high-vacuum systems. They are small, quiet and clean, and even come in chemically-hardened versions if you're creating nasty smells. They also have no problems with generating oil mist.
The best is the enemy of the perfectly good enough, but if you're searching for a new solution, these are the bee's knees:
Last edited by Struan Gray; 01-30-2008 at 03:30 AM. Click to view previous post history.