At 10:14 AM 10/2/2003, you wrote:
>Do any one have experience with  the use of rebuild filaments by SIS for
>Delta Plus XL.  I have seen a gradual loss of sensitivity within a day on
>my instrument. I installed it on this monday and  I started using it from
>Wednesday. I degassed the filament slowly (2-3hrs) before I turned the
>source permanently. The vacuum is in excellent status.

I've been using a SIS rebuild on my Delta Plus since January of this year.
As I recall it did take a little longer to stabilize than the previous
Finnigan filament. I would have to tweak the source tune every few days to
keep the sensitivity up, but nothing drastic, and nothing that changed
where the peak center was or the calibration.  After a few weeks it settled
down and has been great ever since. For the money, $31.50+shipping for the
rebuild, I will certainly be using them again.

Howard

Howard Sanford
919-513-3039
North Carolina State University
Dept. of Soil Science
Box 7619
3114 Williams Hall
Raleigh, NC 27695
http://www.soil.ncsu.edu/services/sims/