John F. Google Maser contamination and you will find a Russian blurb describing what I'm talking about. Even with LN2 traps they had problems. Corby Dawson ____________________________________________________________ $350,000 Life Insurance Coverage as low as $13.04/month. Free, No Obligation Quotes. http://thirdpartyoffers.juno.com/TGL3141/4c7ff7df46a9ee0fabm04duc

Hi Corby, I don't doubt it for an instant. Oil pumps just don't hack it for UHV. If you are going to use oil pumps for almost anything serious you must use an LN2 trap. In a He Leak Detector, for example, an oil system is often used. BTW, Varian specifically say not to use Silicone oils as they permanently destroy the mass specs. Do you have an RGA on your MASER? Best, -John =============== > John F. > > Google Maser contamination and you will find a Russian blurb describing > what I'm talking about. Even with LN2 traps they had problems. > > Corby Dawson > ____________________________________________________________ > $350,000 Life Insurance > Coverage as low as $13.04/month. Free, No Obligation Quotes. > http://thirdpartyoffers.juno.com/TGL3141/4c7ff7df46a9ee0fabm04duc > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > >