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RE: Correction on Minimum Ripple

Most meters read rms. 155-180mVrms is 438-509mVp-p, so PSUD was pretty close. PSUD shows an rms value at the far right of the data section. If you did not include the primary DCR adjusted by turns ratio squared when simulating the power transformer, that might cover the rest of the difference.

155-180mV at the finals, assuming a 20:1 turns ratio in the OPT and allowing for the tube's rp, still leaves 5-7mV hum in the output, which I (and a noticeable portion of Bottlehead's customers) find excessive if the speakers are more than around 98dB/w/m efficiency. But many with lower-efficiency speakers are not bothered by it at all. Hum is fortunately not correlated with signal envelope fluctuations so, like vinyl surface noise, it is easier to ignore than some seemingly more subtle issues.


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