All about the microphone preamplifier! - Mic & Mod
What Is a Mic Preamp, and Why Do I Need One? – Flypaper
Amazon.com: Rodyweil Microphone Preamp Mic Gain Booster with 2 Input Max 75db Gain 48V Phantom Power XLR Output for Dynamic and Condenser Mic : Musical Instruments
Amazon.com: Rodyweil Microphone Preamp - DI Box - 4 Input Mic Preamplifier Booster - with 48V Phantom Power : Musical Instruments
Q. What makes a good mic preamp?
Dynamic and Electret Condenser Microphone Preamp Circuit