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[TCML] suggestions for nst cracks in potting

   Have a couple of nsts12/60 and 15/60. Opened the top and there are fissiors and cracks in tar. Probably due to the tar drying out over time and shrinking.  these cracks seem to be an easy path for arcing across windings internaly. Read Barts and others experience about repotting, etc.  Im interested in getting the most life out of them as they don't grow on trees!$!  Heating them up in a rod oven seems like the simplest .  Any more suggestions would be appreciated.
 Have built nice t-filter for the 15k that will be used on new TC.
                                                                         Thanks, Bob
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