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RE: ESR

"I cannot understand anyone would put that kind of capacitance in an amp at 600 to 800vdc because we aren't talking massive amounts of current at those voltages"

I agree with everything you've said, and I completely believe the improvements you heard from the caps you installed. I'm just skeptical that ESR is the culprit. 2,700 uF caps almost certainly exhibit a lot of hysteresis, not to mention their inductance at higher frequencies. As you say, it's just not an appropriate value for this application.


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