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I can't tell if the break-down happened because of a defect in the insulator, or if corona from a sharp edge degraded the insulator.? Either way, the insulator should be replaced as it will be impossible to get rid of the carbon track on the insulator.?

There is quite a lot of bolt sticking out of the top of the insulator.? If one can be found, a taller insulator, using the same length bolt, would be a good idea.

Eric

WB6TIX

On Thu, Nov 7, 2024 at 6:10?PM Robin Midgett via <RobinK4IDC=gmail.com@groups.io> wrote:

I'd like to know if any of?you have suggestions as to what caused this HV arc to chassis and hopefully, what to do to prevent it in the?future.

Amp is a TenTec Centurion. It was at idle when the arc happened; no RF applied. The glitch resistor took the brunt of the discharge, thank goodness. I've replaced it,?even though the original still?measured the?correct?resistance, it was visually damaged. The event spooked me...new pair of 3-500Z tubes was in the amp; no apparent?damage.

The insulator appears to be made of fiberglass. The glitch resistor is on the opposite side of this aluminum panel. The HV feeds through from the resistor via the machine screw. Any thoughts?

Thanks,

Robin Midgett K4IDC