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Old 15th May 2019
Many of my mics here are around 3~4 db self noise by using extremely low noise jfets and bipolar transistors at .5 to .7 nv/hz/sq self noise specs. My mic preamps are -136 db EIN with a shorted input, -132 db EIN at 50 ohms ( which most of my mics are).

Practical results show all you hear is random room noise, no electronic hiss at all. That creates what I call "digital black" with a silent background. Electric instruments may show residual self noise but the mics are silent in use. I love the space between the notes.