The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Unpotting a Neon Transformer It has been said before that most neon transformer failures relate to the tar instead of the actual windings.  (Carbon tracks that form inside - especially when used to power Tesla Coils!) So I took the hammer and chisel and some spirits and unpotted a 9kV 60mA and a 5kV 120mA... 9kV 60mA Works great now! 5kV 120mA The tools! Added one output wire to 9kV 60mA Needed to redo both output wires on the 5kV 120mA Side by side for comparison - left 9kV 60mA, right 5kV 120mA A beautiful Io Dreaming of mice and squirrels!