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Re: vacuum pump on da ebay
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
Also has a 2 stage that's rated .1 micron/millitorr. Always thought a
diffusion or turbomolecular was needed for that low (almost low
enough to make your own vacuum tubes/caps/etc).
That, of course, is the seller's number at ZERO pumping
speed. A 2-stage pump in halfway decent shape can get down to of the
order of a micron if the oil is clean. OK for discharge tubes but
some sort of diffusion pump is needed if you want to get to a "black" vacuum.