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Message: [QUOTE="aazaa, post: 1001634, member: 67708"] [B]second channel distortion[/B] The corrected NFB circuit is integrated in the second channel. [B][I]IMD 0,0061% THD 0,0077%[/I][/B] The level of distortion is comparable to the results of the experimental first channel. Differences: - IMD: the small peak at 2kHz is gone - THD: only peaks at 2kHz, 3kHz and 5kHz, the first harmonic distortion frequencies. peaks at 4kHz and 6khz are gone. I suppose the additional small parasitic peaks in the measurements of the first channel were due to the experimental state of the build. There was a direct possibility to change capacitor/no capacitor/corrected THD. The 1M trimpot was not installed properly, the extra wires were too long. Strangely enough, no 5kHz peak was visible on the first THD measurement. [IMG]https://drive.google.com/uc?export=view&id=13BZpTXMy7dI9J0YlURJLPS62YVjPa3V0[/IMG] [IMG]https://drive.google.com/uc?export=view&id=1WX5bWFLhRtQ5CPDIz4VlTPyFuEUj3Oox[/IMG] Paul [/QUOTE]