Explain Like I'm 5": Common Parts Markings and Polarity – DIY Recording Equipment
Akafugu Corporation
OpAmp Test Jig PCB – FiveFish Audio Blog
BAE 1073 MPF
Neve 1073 - Gearspace.com
What do these 3 empty circles on this schematic of a Neve 1073 represent? And what does the very skinny black arrow horizontally pointing directly at the #3 empty circle represent as