At your risk and at your responsibility.
On analog electronic circuit constructing or designing one plays or communicates directly with electrons.
For example connecting the right bias (positive pull up bias while keeping grid still negative) to the control grid of an electron tube so that electrons can find their way to a very low voltage anode. A music signal can find its way to the anode at pristine sound quality. Even the faintest signal fed to grid can be amplified without being buried in a sea noise of thermally or otherwise agitated electrons.
See also as reference to above example:
Pleiades V6 schematic
Pleiades bias - euroelectron
Pull up bias
Operating features of the Audion - E. H. Armstrong
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