Don Hicks Slow Blow 5687 tube microphone preamp vs planet slowblown
GitHub - naufalboys/Mic-Preamp: A simple mic preamp for interfacing a balanced microphone (3-Pin using XLR Connector) with PC Sound Card or other gear. This PCB Design is double sided. If you have
Op Amp Preamplifier Circuits - For MICs, Guitars, Pick-ups, Buffers | Homemade Circuit Projects
Balanced Microphone Preamp Project (HSR Aug 84)
Bespoke Mic Preamp based on Akai/Roberts circuit – Preservation Sound
microphone - Mic preamp, fixing noise and gain issues - Electrical Engineering Stack Exchange