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Back| J1 | 1 uF | Unpolarized capacitor | | | | C3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | | S1 | 1 | B10k | Potentiometer | | | | | S3 | 1 aoKicad | 1 Consider replacing transistor through-holes with sockets or with modifications This won't be easy; need both A1M (x3) and B10K (x1) sliders in the mid surdos.