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OTL, Output Transformerless Amplifier User Group.

Now I am confused

I thought you said in your original post above that your amps had 28,000uF of capacitance, or are you now referring to the HV supply? Either way, I have never been convinced that Black Gate electrolytics were particularly magical, and I don't think the ESR of a BG would be any lower than that of a top line Panasonic (TS series) or Nichicon. Bypass film caps will give more bang for the considerable bucks of a BG (but I guess you already own the VKs). On the HV supply, I use pi filters. Start with around 50uF then use a low DCR inductor (I use Hammond 3H) followed by 100uF or 220uF.


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