Sound Devices MP-1 Single Channel Mic Preamp - Sound Productions
Audio Preamp Adapter Comica LINKFlEX AD2 XLR/ 6.35mm Mic Preamp, Guitar Interface Adapter for Smartphone DSLR Camera Karaoke Mic| | - AliExpress
FEL Mini MicBooster Preamp - micbooster.com
Rent Mic Preamp SHURE FP-23 BATTERY POWERED MIC PREAMP Rental – Crossfire Pro AV Rentals
Amazon.com: Nicama XLR Female to 3.5mm TRS and TRRS Adapter with Phantom Power for Shotgun or Condenser Microphones, V2 Mic Preamp for iPad DSLR Camera : Musical Instruments
Battery-powered microphone preamplifier with headphone monitoring | Periactes