Sound Skulptor: MP-AB528 Microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP-AB528
Microphone AMP - Board with LM4864 Microphone Preamplifier
Sound Skulptor: MP512 Microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP512
CP5 Colour Mic Preamp – DIY Recording Equipment
Amazon.com : Saramonic CaMixer Microphone Kit with Dual Stereo Condenser Mics, Digital Mixer & XLR/Mini-XLR Input with +48V Phantom Power Preamp - for DSLR Cameras and Camcorders : Electronics
Sound Skulptor: MP566 Tube microphone preamplifier for the '500' Lunchbox - Kit, Preamplifiers, MP566
CanaKit UK495 - Electret Microphone Pre Amp by CanaKit - assembled circuit board UK495
Amazon.com: Tonton High Sensitive Weatherproof Preamp Microphone Audio Pickup Device Sound Voice Pickup Kit with 60 Feet Cable and Power Supply for CCTV Surveillance Camera System : Electronics