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Hi Joshua, "On Wed, Nov 24, 2021, 7:58 PM Joshua Thomas <joshuafthomas@xxxxxxxxx> wrote: Gary, I had been reading your notes on filtering and resistor inductance here: http://www.laushaus.com/rcl_filter_simulation.htm I had to check with the manufacturer, but the self-inductance of my 500 ohm wire-wound capacitors is 220 uH. My resistor's actual measurement is 470 ohm. An RCL simulator with 470 ohm, 220 uH and 1 nF (the setup I was using) shows a small signal gain in the frequency range my coil resonates. It's not much - less than 2 dB - but it's enough to make me wonder if this contributed to the damage to my capacitors. I will be choosing a capacitance value for the rebuild of the filter which doesn't have any gain in my coil resonant range. As well as significantly more capacitors to limit the stress per capacitor. -Joshua Thomas" I want to say to not forget at the time of burning them up you were accidentally floating your center tap NST. Could very well be a factor also... Chris Reeland Ladd Illinois USA Sent from my Lenovo Tablet