API 312 500 Series Discrete Microphone Preamp #0007-20 (Used)

SSL VHD 500 Series Microphone Preamp (Used)

SSL Six Ch 500 Series Channel Strip with Mic Preamp, EQ, Single Knob Compressor

CAPI VP312 500 Series Mic Pre: Pick Your OpAmp (Built & Ready to Ship)

focusrite isa 220

SSL SiX CH 500 Series Channel Strip with Mic Preamp, EQ, Single Knob Compressor

Rupert Neve Designs Portico 511 500-Series Mic Pre Module with Silk