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Our Finnigan filaments sometimes have this problem. Maybe the tension on the filament before welding is not correct. We have had very good luck with Scientific Instrument Services rebuilt filaments over the years. Don't know the last time I actually purchased a new one from Finnigan. They also have excellent technical support. Maybe they could help if you call.. James L. Little Bldg 150 Eastman Chemical Company Kingsport, TN 37662-5150 Tel 423-229-8685 FAX 423-229-4558 "A Little Mass Spectrometry and Sailing": http://users.chartertn.net/slittle Sailing Club (Intranet) Web Page: http://eastmanweb/fp39/ Gun Blomkvist wrote... }We have been using an Agilent 5973 instrument for about two years, }mainly for analysis of organohalogens with NCI/methane. Earlier this }year we began experiencing problems with the filaments; shortly after }installation of a new filament, sensitivity started to decrease }rapidly and we found that the filament was bent. As this has been }repeated several times, it seems that Agilent's production methods }have changed somehow. }Two questions: }1) Has anybody else had the same problem? }2) We have found that older batches of filaments, part no. }G.1099-80053, batch no beginning with 0, work well. Does anybody have }one or more of these and is willing to part with them? }Regards, }Gun James L. Little Bldg 150 Eastman Chemical Company Kingsport, TN 37662-5150 Tel 423-229-8685 FAX 423-229-4558 "A Little Mass Spectrometry and Sailing": http://users.chartertn.net/slittle Sailing Club (Intranet) Web Page: http://eastmanweb/fp39/
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