Carla did the test. That is what she wrote in Feb 04th:  "I am done with the HV testing at ITE - the results were the same as at ITW. It stayed at 59kV for 30 mins with no issues. Trying to go above 59.5kV is probably possible but a bit more risky. ITE also has a band, from 54-56kV, where the current jumps around like crazy".