Re: What sort of output coupling Capacitor on a Ravensbrook
The output capacitor is in series with the output, not across it, so the only sense in which it is loading the output is whilst it charges up on switch-on. A larger value would reduce LF distortion - the criterion here is that not more than 80mV should be dropped across the capacitor at the lowest frequency of interest. Some exotic components (for example, a Serafine Supercap as measured by Self) have lower measured distortion at higher frequencies as well, but this is probably irrelevant to the present case.
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