{Collins} reading capacitor codes on trimmer caps

I need some assistance to interpret what many may consider a rather primitive question.  I'm working on a 32V2.  All of the trimmer caps have been damaged.  The coding on each is N750 8-50.  I know the 8-50 is the capacitance range, but the N750?  Designates what?  I ordered replacements from SSN.  The codes on their units read either T8-50E, E8-50E or T8-50E.  What does the E and T stand for?  Thanks for any response.  73, Mike  K4ELV
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