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If you have any teflon sleeving, put an inch length over the wire where it goes through the grommet. If you only have teflon sheet, cut an inch square and wrap it around the wire through the grommet. If you don't have any teflon, use plastic bag but I'd be wary of plastic. I've never used it in this manner but some plastics break down really easily in the presence of high voltage. 0.01"-thick teflon withstands 1900 VDC, so a double or triple-wrap of sheet would easily work. I've used 0.019" teflon sheet to build HV bypass capacitors for the old AM-6154/6155 amplifiers before.

Steve, K0XP

Thanks Jim, I agree with your assessment. I replaced the feed through with a rubber grommet?and soldered the HV wire directly to the glitch resistor. That seems to work fine business.

Thanks,

Robin Midgett K4IDC

On Fri, Nov 8, 2024 at 9:12?AM Jim VE7RF via <jim.thom=[email protected]> wrote:

That's caused by....'surface creep'..... which will also depend on any dust/gunk / fluff sitting on the insulator.? ?The insulator can be cleaned up. The easy fix is to put a small piece of plastic sheet (with a hole in it). ..before the arced insulator is installed.? That will increase the leakage path by a bunch. ( plastic goes between the insulator and metal side wall)...so the hole in the plastic is just big enough....then the lip of the insulator sits on the plastic sheeting.? ? ?That or replace with a longer feedthrough HV connector, or use a feedthrough insulator ( 2 x piece type)...that is of the serrated type....which will also increase the leakage path by a bunch.?