Bart,
I have a Jefferson 15/60 NST that I unpotted. I removed the outer
lamination frame
from the straight core part to do a better job of cleaning it up. The outer
lamination
frame can be slid off from the straight core, although it's difficult to do.
Then when I
reassembled it, I was not able to fit every thin lamination back in place,
so I left a
few out. I did not remove any shunts because the only way to remove them
would be to cut a part off from each lamination. When I connected this NST
to
my coil, it drew about 3500 VA. I don't remember if I measured the wattage
or power factor. I forget also what type of coil it was. But in any case
the unpotting may have increased the power draw in this case. I
unfortunately don't
remember how the NST behaved before I unpotted it. I was probably feeding
the NST 140 volts. So the current draw was about 25 amps or so. If I
remember correctly, I was using a static gap. Maybe just leaving out a
few laminations might increase the current draw substantially, if the current
draw did actually increase after unpotting. Or maybe the unpotting affected
it by sliding the frame off the straight core. Maybe the current draw is
very
sensitive to all this. I don't know. Something to consider though.
John
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