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LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the Gate In jack and switching ground contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc5mah A Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3maav-1 AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, retention spring, https://www.neutrik.com/en/product/ncj9fi-v Combo I series, 3 pole female XLR receptacle, grounding: separate ground contact connected to shell ground, but not that small - C7 is a ceramic 104 power cap like C5, C6, C8, C9 | 4 .../PCB/precadsr_Gerbers/precadsr-job.gbrjob .

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