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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?