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I got nothing on the wax Dave, but it is good to hear chatter on the list.? My guess is that the water was in the oil of the vacuum pump.? Vacuum oil is cheap so change it out often.? I am cheap too so I let my old oil sit in a plastic?container for a year or two and then pour off the clean stuff that is floating above the sludge.? the oil itself never really wears out.?? I would be amazed if that wax was really the seal for a vacuum system.? have you removed it and looked to see if them wires actually?attach to something that has a gasket.? copper gaskets never age out but people use buna or viton sometimes and that does have a shelf life.? Look for stuff like that.? The wax may just be some high voltage silicone putty sitting over the high vacuum electrical passthru pins.?? Dont SEM's have scintillation crystals or something that die if they sit in air for too long.? I not up on SEM's but interested in your rebuild.?? Oh,? I have a 68" dia x 68" deep vacuum chamber free to a good home for a tax write off letter if anybody knows a school looking for a great Mars simulation chamber.? contact me directly if you think this is your next great adventure.?? Drew in sunny Florida? On Sun, Apr 3, 2022 at 6:07 PM Dave McGuire <mcguire@...> wrote:
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