gc-ms Tune troubleshooting

Hi everyone,

Hi all, we have a problem when applying the Tune for the Agilent 7890B 5977A GC/MS instrument, it does not reach the end of the process and that causes a very high background noise, we have already cleaned the source (EI) and also we have put a new electron multiplier, and also the two filaments are working very well and even the level of PFTBA is correct. can you help us please?

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