Denecke AD-20 Portable Microphone Preamp AD-20 B&H Photo Video
Sound Devices MM-1 Mic Preamp - Sound Productions
Amazon.com: Audio Preamp Adapter Comica LINKFlEX AD2 XLR/ 6.35MM Microphone Preamp Amplifier with 48V Phantom Power, Guitar Interface Adapter for iPhone,iPad,Android Smartphone and DSLR Cameras : Musical Instruments
Sescom SES-IL-MICPRE Active Inline XLR Microphone Preamplifier with Power Switch & Adapter
Amazon.com: Xvive P1 Phantom Power Supply 48V/12V Switch,Up to 40 Hours of Use,Rechargeable Portable Phantom Power for Condenser/Shotgun Microphones, Mic Preamp, Recording Studios : Musical Instruments