This transformer started as a dead France 15kv/60ma. Upon unpotting it I found
that one of the secondary windings was burnt and showed an open circuit.
So I shelved it hoping to find another secondary for it some day.

I dug it back out one day and got curious as to the exact problem with the
burnt secondary. So I began stripping off the winding layer by layer until I found
the burnt spot. Once I had identified the good free end and made a few measurements
I realized there were enough turns still remaining for 12kv. I stripped turns off the other
good secondary until both showed identical resistances.

I removed 4 shunt plates from each shunt block and coated the secondary windings
with RTV. I placed strips of HDPE cut from a plastic bottle between the secondaries
and the core.

The tank is made from plywood and coated on the interior with 2 coats of polyester
resin. Its filled with approximately 3 quarts of mineral oil.

I tested the completed transformer on a Jacobs ladder for several 10 minute
runs and found it remained quite cool.

The finished transformer rates at 12720 Volts / 105 ma and gives 48 inch streamers
on my 4 inch coil with .015 mfd of primary capacitance.